Einstein Toolkit Documentation - User contributions [en]

GW150914 VisIt Tutorial

2016-06-16T02:20:14Z

Noncct pmoesta: /* Visualizing the spacetime of GW150914 with VisIt */

=Visualizing the spacetime of GW150914 with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial

2016-06-16T02:19:55Z

Noncct pmoesta: /* Creating a host profile */

GW150914 VisIt Tutorial ETWS

2016-06-15T03:47:01Z

Noncct pmoesta: /* A volume rendering example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

==A volume rendering example==

First, load the 3D data

[[Image:3ddata.png]]

then add a volume plot <tt> Add Plot > Volume </tt>

[[Image:Vol2.png]]

Adjust the volume plot arguments as follows to get an initial plot

[[Image:Vol1.png]]

[[Image:Vol3.png]]

and click <tt> Draw </tt>. Afterwards feel free to adjust the settings for the 1D transfer function used to generate the volume rendering.

== Further documentation ==

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T03:45:56Z

Noncct pmoesta: /* A volume rendering example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

==A volume rendering example==

First, load the 3D data

[[Image:3ddata.png]]

then add a volume plot <tt> Add Plot > Volume </tt>

[[Image:Vol2.png]]

Adjust the volume plot arguments as follows to get an initial plot

[[Image:Vol1.png]]

[[Image:Vol3.png]]

and click <tt> Draw <\tt>. Afterwards feel free to adjust the settings for the 1D colormap used to generate the volume rendering.

== Further documentation ==

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T03:44:57Z

Noncct pmoesta: /* A volume rendering example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

==A volume rendering example==

First, load the 3D data

[[Image:3ddata.png]]

then add a volume plot <tt> Add Plot -> Volume ,/tt>

[[Image:Vol2.png]]

Adjust the volume plot arguments as follows to get an initial plot

[[Image:Vol1.png]]

[[Image:Vol3.png]]

and click <tt> Draw <\tt>. Afterwards feel free to adjust the settings for the 1D colormap used to generate the volume rendering.

== Further documentation ==

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Vol3.png

2016-06-15T03:42:56Z

Noncct pmoesta:

GW150914 VisIt Tutorial ETWS

2016-06-15T03:41:05Z

Noncct pmoesta: /* A volume rendering example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

==A volume rendering example==

First, load the 3D data

[[Image:3ddata.png]]

then add a volume plot <tt> Add Plot -> Volume ,/tt>

[[Image:Vol2.png]]

Adjust the volume plot arguments as follows to get an initial plot

[[Image:Vol1.png]]

[[Image:Vol3.png]]

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T03:39:43Z

Noncct pmoesta: /* Visualizing the spacetime with VisIt */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

==A volume rendering example==

First, load the 3D data

[[Image:3ddata.png]]

then add a volume plot <tt> Add Plot -> Volume ,/tt>

[[Image:Vol1.png]]

[[Image:Vol2.png]]

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Vol2.png

2016-06-15T03:37:05Z

Noncct pmoesta:

File:Vol1.png

2016-06-15T03:36:38Z

Noncct pmoesta:

File:3ddata.png

2016-06-15T03:36:15Z

Noncct pmoesta:

File:Surfaces.png

2016-06-15T03:02:38Z

Noncct pmoesta:

GW150914 VisIt Tutorial ETWS

2016-06-15T03:01:21Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:Surfaces.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:59:32Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:59:03Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. You will need to adjust the path to substitute your username for <tt> einstein </tt>

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:57:50Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>.

[[Image:Data.png]]

We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>.

[[Image:Addplot.png]]

If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:56:26Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Data.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Data.png

2016-06-15T02:55:40Z

Noncct pmoesta:

File:Addplot.png

2016-06-15T02:55:10Z

Noncct pmoesta:

GW150914 VisIt Tutorial ETWS

2016-06-15T02:46:11Z

Noncct pmoesta: /* Opening the databases */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:Connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:45:53Z

Noncct pmoesta: /* Opening the databases */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

[[Image:connect.png]]

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Connect.png

2016-06-15T02:45:03Z

Noncct pmoesta:

GW150914 VisIt Tutorial ETWS

2016-06-15T02:19:00Z

Noncct pmoesta: /* Opening the databases */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

Select the newly created machine and when prompted enter your password to login. Navigate to <tt> /storage/data/GW150914/output-0000/data/ </tt>

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial ETWS

2016-06-15T02:17:23Z

Noncct pmoesta:

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial

2016-06-15T01:20:02Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial

2016-06-15T01:18:40Z

Noncct pmoesta: /* A visualization example */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:openfiles.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Openfiles.png

2016-06-15T01:17:51Z

Noncct pmoesta:

GW150914 VisIt Tutorial

2016-06-15T01:15:22Z

Noncct pmoesta: /* Creating a host profile */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as
follows but change the username to the one assigned to you.
[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Vt-2.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

GW150914 VisIt Tutorial

2016-06-14T09:52:31Z

Noncct pmoesta: /* Visualizing the spacetime with VisIt */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as

[[Image:Host_profile_small.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Vt-2.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Host profile small.png

2016-06-14T09:51:45Z

Noncct pmoesta:

GW150914 VisIt Tutorial

2016-06-14T09:48:54Z

Noncct pmoesta: /* Visualizing the spacetime with VisIt */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as

[[Image:Host_profile.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Vt-2.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]

File:Host profile.png

2016-06-14T09:47:28Z

Noncct pmoesta: host_profile setup

host_profile setup

GW150914 VisIt Tutorial

2016-06-14T09:45:25Z

Noncct pmoesta: /* Visualizing the spacetime with VisIt */

=Visualizing the spacetime with VisIt=

==Installing VisIt==

The 3D data output by the simulation (such as the metric, the extrinsic curvature, the curvature, and the apparent horizons) can be visualised with the <tt>VisIt</tt> package. <tt>VisIt</tt> can be obtained at the [https://wci.llnl.gov/simulation/computer-codes/visit/downloads VisIt download page].

The simplest way to install <tt>VisIt</tt> is to download the ready-made executable for the right architecture (Linux, Mac OS X, and Windows are available). On Linux, this will download a tarball containing a directory

visit<version number>.<architecture>

Changing to this directory, the command

bin/visit

will launch the software.

On Mac OS X, a .dmg file will be downloaded first, containing the <tt>VisIt.app</tt> executable.

==Creating a host profile==

First, you will need to create a host profile to instruct VisIt to use the workshop visualization server. Go to <tt>Options > Host profiles ...</tt> and create a new profile. Fill in the information as

[[Image:host_profile.png]]

==Opening the databases==

Once the software is running, the button <tt>Open</tt> can be used to open files from the simulation.

[[Image:vt-1.png]]

If you are using the Simulation Factory to launch and manage the run, the data will be output under the directory <tt><basedir>/<simulation name>/output-<nnnn>/<parfile name></tt>, where <tt><nnnn></tt> is the number of the restart. There are essentially two types of files that can be visualised with VisIt:

* Files from the thorn <tt>CarpetIOHDF5</tt>, with .h5 extension, which will be read by the CarpetHDF5 plugin in VisIt and represent the 1D, 2D, or 3D configuration of a specific field, on a number of constant-time spaces;
* Files from the thorn <tt>QuasiLocalMeasures</tt>, with .vtk extension, which are read natively by <tt>VisIt</tt> and represent the shape and properties of relevant 2D topological spheres, such as the apparent horizons, also at different times;

==A visualization example==

Let us, for instance, plot the configuration of the conformal factor <tt>ML_BSSN::phi</tt> on the xy plane, and superimpose the apparent horizon shapes. We first need to load the data for the conformal factor on this plane, using the Open button and selecting the correct path for the database <tt>phi.*.xy.h5</tt>. We can then generate the plot by clicking <tt>Add > Pseudocolor > ML_BSSN--phi</tt>. If the <tt>Auto Apply</tt> feature in <tt>VisIt</tt> is not selected, we need to click on <tt>Draw</tt> to make the plot appear.

[[Image:Vt-2.png]]

[[Image:vt-3.png]]

[[Image:vt-4.png]]

If necessary, we can tune the colormap until the plot looks like the one below (this result has been obtained by selecting the <tt>Plot Attributes > Pseudocolor...</tt> menu and choosing a <tt>Skew</tt> value of 1000):

[[Image:vt-5.png]]

Next, we can plot the horizon surface of the first black hole by opening the <tt>surface01_*.vtk</tt> database, and using <tt>Add > Mesh > mesh</tt>. We can similarly add the second horizon by following the previous steps for the <tt>surface02_*.vtk</tt> database.

[[Image:vt-6.png]]

[[Image:vt-7.png]]

[[Image:vt-8.png]]

The plot depicts now the system’s conformal factor and horizons at t=0. To cycle through subsequent times, we need to create a database correlation first, telling <tt>VisIt</tt> how to match the time indices in the <tt>phi.*.xy.h5</tt>, <tt>surface01_*.vtk</tt>, and <tt>surface02_*.vtk</tt>. To create the database, we need to use the menu <tt>Controls > Database correlations</tt>, select <tt>New…</tt>, select the three databases on the left window (<tt>Sources</tt>) and move them right using the right arrow. Once the databases appear in the <tt>Correlated sources</tt> window, we can name the correlation, select <tt>Cycle</tt> for the correlation method, and click <tt>Create database correlation</tt>. Once the correlation is created, an <tt>Active time slider</tt> menu will appear just below the <tt>Active Source</tt> menu, indicating that our correlation is now controlling the slider; moving this slider will then step through the three databases simultaneously, making sure that all the plotted data refers to the same time coordinate.

<tt>VisIt</tt> provides a number of tools and options to tune this visualization, output it to image or movie files, save and restore sessions, remote visualization, and so on. More information can be found on the [https://wci.llnl.gov/simulation/computer-codes/visit/manuals Manuals page].

[[Image:vt-9.png]] [[Image:vt-10.png]] [[Image:vt-11.png]]