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[http://www.paraview.org ParaView] is a general-purpose 3D scientific visualization tool. It is open-source and compiles on all popular platforms (Linux, Windows, Mac), understands a large number of input file formats, provides multiple rendering modes, supports Python scripting, and can scale up to tens of thousands of processors for rendering of very large datasets.
[http://www.paraview.org ParaView] is a general-purpose 3D scientific visualization tool. It is open-source and compiles on all popular platforms (Linux, Windows, Mac), understands a large number of input file formats, provides multiple rendering modes, supports Python scripting, and can scale up to tens of thousands of processors for rendering of very large datasets.


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* [[ParaView|Using ParaView on Compute Canada systems]]
* [[ParaView|Using ParaView on Compute Canada systems]]
* [http://www.paraview.org/documentation ParaView official documentation]
* [http://www.paraview.org/documentation ParaView official documentation]
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Similar to ParaView, [https://wci.llnl.gov/simulation/computer-codes/visit/ VisIt] is an open-source, general-purpose 3D scientific data analysis and visualization tool that scales from interactive analysis on laptops to very large HPC projects on tens of thousands of processors.
Similar to ParaView, [https://wci.llnl.gov/simulation/computer-codes/visit/ VisIt] is an open-source, general-purpose 3D scientific data analysis and visualization tool that scales from interactive analysis on laptops to very large HPC projects on tens of thousands of processors.


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* [[VisIt|Using VisIt on Compute Canada systems]]
* [[VisIt|Using VisIt on Compute Canada systems]]
* [https://wci.llnl.gov/simulation/computer-codes/visit/manuals VisIt manuals]
* [https://wci.llnl.gov/simulation/computer-codes/visit/manuals VisIt manuals]
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[http://www.ks.uiuc.edu/Research/vmd VMD] is an open-source molecular visualization program for displaying, animating, and analyzing large biomolecular systems in 3D. It supports scripting in Tcl and Python and runs on a variety of platforms (MacOS X, Linux, Windows). It reads many molecular data formats using an extensible plugin system and supports a number of different molecular representations.
[http://www.ks.uiuc.edu/Research/vmd VMD] is an open-source molecular visualization program for displaying, animating, and analyzing large biomolecular systems in 3D. It supports scripting in Tcl and Python and runs on a variety of platforms (MacOS X, Linux, Windows). It reads many molecular data formats using an extensible plugin system and supports a number of different molecular representations.


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* [[VMD|Using VMD on Compute Canada systems]]
* [[VMD|Using VMD on Compute Canada systems]]
* [http://www.ks.uiuc.edu/Research/vmd/current/ug VMD User's Guide]
* [http://www.ks.uiuc.edu/Research/vmd/current/ug VMD User's Guide]
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The Visualization Toolkit (VTK) is an open-source package for 3D computer graphics, image processing, and visualization. The toolkit includes a C++ class library as well as several interfaces for interpreted languages such as Tcl/Tk, Java, and Python. VTK was the basis for many excellent visualization packages including ParaView and VisIt.
The Visualization Toolkit (VTK) is an open-source package for 3D computer graphics, image processing, and visualization. The toolkit includes a C++ class library as well as several interfaces for interpreted languages such as Tcl/Tk, Java, and Python. VTK was the basis for many excellent visualization packages including ParaView and VisIt.


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* [[VTK|Using VTK on Compute Canada systems]]
* [[VTK|Using VTK on Compute Canada systems]]
* [https://itk.org/Wiki/VTK/Tutorials VTK tutorials]
* [https://itk.org/Wiki/VTK/Tutorials VTK tutorials]


=== YT ===
=== YT === <!--T:152-->
YT is a Python library for analyzing and visualizing volumetric, multi-resolution data. Initially developed for astrophysical simulation data, it can handle any uniform and multiple-resolution data on Cartesian, curvilinear, unstructured meshes and on particles.
YT is a Python library for analyzing and visualizing volumetric, multi-resolution data. Initially developed for astrophysical simulation data, it can handle any uniform and multiple-resolution data on Cartesian, curvilinear, unstructured meshes and on particles.


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* [[yt|Using YT on Compute Canada systems]]
* [[yt|Using YT on Compute Canada systems]]


= Visualization on Compute Canada systems = <!--T:6-->
= Visualization on Compute Canada systems = <!--T:6-->


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There are many options for remote visualization on Compute Canada systems. In general, whenever possible, for interactive rendering we recommend '''client-server visualization''' on interactive nodes, and for non-interactive visualization we recommend '''off-screen batch jobs''' on regular compute nodes.
There are many options for remote visualization on Compute Canada systems. In general, whenever possible, for interactive rendering we recommend '''client-server visualization''' on interactive nodes, and for non-interactive visualization we recommend '''off-screen batch jobs''' on regular compute nodes.


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Other, ''less efficient'' options are X11-forwarding and VNC. For some packages these are the only available remote GUI options.
Other, ''less efficient'' options are X11-forwarding and VNC. For some packages these are the only available remote GUI options.


=== Client-server interactive visualization ===
=== Client-server interactive visualization === <!--T:156-->


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In the client-server mode, supported by both ParaView and VisIt, all data will be processed remotely on the cluster, using either CPU or GPU rendering, while you interact with your visualization through a familiar GUI client on your laptop. You can find the details of setting up client-server visualization in [[ParaView]] and [[VisIt]] pages.
In the client-server mode, supported by both ParaView and VisIt, all data will be processed remotely on the cluster, using either CPU or GPU rendering, while you interact with your visualization through a familiar GUI client on your laptop. You can find the details of setting up client-server visualization in [[ParaView]] and [[VisIt]] pages.


=== Remote windows with X11-forwarding ===
=== Remote windows with X11-forwarding === <!--T:158-->


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In general, X11-forwarding should be avoided for any heavy graphics, as it requires many round trips and is much slower than VNC (below). However, in some cases you can connect via ssh with X11. Below we show how you would do this on our clusters. We assume you have an X-server installed on your laptop.
In general, X11-forwarding should be avoided for any heavy graphics, as it requires many round trips and is much slower than VNC (below). However, in some cases you can connect via ssh with X11. Below we show how you would do this on our clusters. We assume you have an X-server installed on your laptop.


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<tabs>
<tabs>
<tab name="Cedar and Graham">
<tab name="Cedar and Graham">


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Connect to Cedar or Graham with the -X/-Y flag for X11-forwarding. You can start your graphical application on the login node (small visualizations)
Connect to Cedar or Graham with the -X/-Y flag for X11-forwarding. You can start your graphical application on the login node (small visualizations)


   module load vmd
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module load vmd
   vmd
   vmd


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or you can request interactive resources on a compute node (large visualizations)
or you can request interactive resources on a compute node (large visualizations)


   salloc --time=1:00:0 --ntasks=1 --mem=3500 --account=def-someprof --x11
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salloc --time=1:00:0 --ntasks=1 --mem=3500 --account=def-someprof --x11


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: and, once the job is running, start your graphical application inside the job
: and, once the job is running, start your graphical application inside the job


   module load vmd
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module load vmd
   vmd
   vmd


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</tab>
</tab>
<tab name="Niagara">
<tab name="Niagara">


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Since runtime is limited on the login nodes, you might want to request a testing job in order to have more time for exploring and visualizing your data. On the plus side, you will have access to 40 cores on each of the nodes requested. For performing an interactive visualization session in this way please follow these steps:
Since runtime is limited on the login nodes, you might want to request a testing job in order to have more time for exploring and visualizing your data. On the plus side, you will have access to 40 cores on each of the nodes requested. For performing an interactive visualization session in this way please follow these steps:


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<ol>
<ol>
<li> ssh into niagara.scinet.utoronto.ca with the -X/-Y flag for X11-forwarding
<li> ssh into niagara.scinet.utoronto.ca with the -X/-Y flag for X11-forwarding
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<li> run your visualization program, eg. VMD </li>
<li> run your visualization program, eg. VMD </li>


   module load vmd
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module load vmd
   vmd
   vmd


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<li> exit the debug session.
<li> exit the debug session.
</ol>
</ol>


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</tab>
</tab>
</tabs>
</tabs>
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=== Webinars and other short presentations === <!--T:10-->
=== Webinars and other short presentations === <!--T:10-->


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[https://westgrid.github.io/trainingMaterials/tools/visualization/ WestGrid's visualization training materials page] has embedded video recordings and slides from the following webinars:
[https://westgrid.github.io/trainingMaterials/tools/visualization/ WestGrid's visualization training materials page] has embedded video recordings and slides from the following webinars:


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* YT series: “Using YT for analysis and visualization of volumetric data” (Part 1) and "Working with data objects in YT” (Part 2)
* YT series: “Using YT for analysis and visualization of volumetric data” (Part 1) and "Working with data objects in YT” (Part 2)
* “Scientific visualization with Plotly”
* “Scientific visualization with Plotly”
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* “Graph visualization with Gephi”
* “Graph visualization with Gephi”


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Other visualization presentations:
Other visualization presentations:


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