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README: Updated VTK-m installation instruction
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README.md
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README.md
@ -132,10 +132,10 @@ and then build. Here are some example *nix commands for the process
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(individual commands may vary).
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```sh
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$ tar xvzf ~/Downloads/vtk-m-v1.4.0.tar.gz
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$ tar xvzf ~/Downloads/vtk-m-v1.9.0.tar.gz
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$ mkdir vtkm-build
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$ cd vtkm-build
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$ cmake-gui ../vtk-m-v1.4.0
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$ cmake-gui ../vtk-m-v1.9.0
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$ cmake --build -j . # Runs make (or other build program)
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```
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@ -147,76 +147,109 @@ Users Guide].
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The VTK-m source distribution includes a number of examples. The goal of the
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VTK-m examples is to illustrate specific VTK-m concepts in a consistent and
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simple format. However, these examples only cover a small part of the
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simple format. However, these examples only cover a small portion of the
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capabilities of VTK-m.
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Below is a simple example of using VTK-m to load a VTK image file, run the
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Marching Cubes algorithm on it, and render the results to an image:
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Below is a simple example of using VTK-m to create a simple data set and use VTK-m's rendering
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engine to render an image and write that image to a file. It then computes an isosurface on the
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input data set and renders this output data set in a separate image file:
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```cpp
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#include <vtkm/Bounds.h>
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#include <vtkm/Range.h>
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#include <vtkm/cont/ColorTable.h>
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#include <vtkm/filter/Contour.h>
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#include <vtkm/io/VTKDataSetReader.h>
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#include <vtkm/cont/Initialize.h>
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#include <vtkm/source/Tangle.h>
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#include <vtkm/rendering/Actor.h>
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#include <vtkm/rendering/Camera.h>
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#include <vtkm/rendering/CanvasRayTracer.h>
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#include <vtkm/rendering/Color.h>
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#include <vtkm/rendering/MapperRayTracer.h>
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#include <vtkm/rendering/MapperVolume.h>
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#include <vtkm/rendering/MapperWireframer.h>
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#include <vtkm/rendering/Scene.h>
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#include <vtkm/rendering/View3D.h>
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vtkm::io::VTKDataSetReader reader("path/to/vtk_image_file.vtk");
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vtkm::cont::DataSet inputData = reader.ReadDataSet();
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std::string fieldName = "scalars";
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#include <vtkm/filter/contour/Contour.h>
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vtkm::Range range;
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inputData.GetPointField(fieldName).GetRange(&range);
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vtkm::Float64 isovalue = range.Center();
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using vtkm::rendering::CanvasRayTracer;
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using vtkm::rendering::MapperRayTracer;
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using vtkm::rendering::MapperVolume;
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using vtkm::rendering::MapperWireframer;
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// Create an isosurface filter
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vtkm::filter::Contour filter;
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filter.SetIsoValue(0, isovalue);
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filter.SetActiveField(fieldName);
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vtkm::cont::DataSet outputData = filter.Execute(inputData);
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int main(int argc, char* argv[])
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{
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vtkm::cont::Initialize(argc, argv, vtkm::cont::InitializeOptions::Strict);
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// compute the bounds and extends of the input data
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vtkm::Bounds coordsBounds = inputData.GetCoordinateSystem().GetBounds();
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auto tangle = vtkm::source::Tangle(vtkm::Id3{ 50, 50, 50 });
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vtkm::cont::DataSet tangleData = tangle.Execute();
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std::string fieldName = "tangle";
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// setup a camera and point it to towards the center of the input data
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vtkm::rendering::Camera camera;
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camera.ResetToBounds(coordsBounds);
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vtkm::cont::ColorTable colorTable("inferno");
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// Set up a camera for rendering the input data
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vtkm::rendering::Camera camera;
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camera.SetLookAt(vtkm::Vec3f_32(0.5, 0.5, 0.5));
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camera.SetViewUp(vtkm::make_Vec(0.f, 1.f, 0.f));
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camera.SetClippingRange(1.f, 10.f);
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camera.SetFieldOfView(60.f);
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camera.SetPosition(vtkm::Vec3f_32(1.5, 1.5, 1.5));
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vtkm::cont::ColorTable colorTable("inferno");
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// Create a mapper, canvas and view that will be used to render the scene
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vtkm::rendering::Scene scene;
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vtkm::rendering::MapperRayTracer mapper;
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vtkm::rendering::CanvasRayTracer canvas(512, 512);
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vtkm::rendering::Color bg(0.2f, 0.2f, 0.2f, 1.0f);
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// Background color:
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vtkm::rendering::Color bg(0.2f, 0.2f, 0.2f, 1.0f);
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vtkm::rendering::Actor actor(tangleData.GetCellSet(),
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tangleData.GetCoordinateSystem(),
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tangleData.GetField(fieldName),
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colorTable);
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vtkm::rendering::Scene scene;
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scene.AddActor(actor);
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// 2048x2048 pixels in the canvas:
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CanvasRayTracer canvas(2048, 2048);
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// Create a view and use it to render the input data using OS Mesa
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// Render an image of the output isosurface
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scene.AddActor(vtkm::rendering::Actor(outputData.GetCellSet(),
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outputData.GetCoordinateSystem(),
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outputData.GetField(fieldName),
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colorTable));
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vtkm::rendering::View3D view(scene, mapper, canvas, camera, bg);
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view.Paint();
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view.SaveAs("demo_output.png");
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vtkm::rendering::View3D view(scene, MapperVolume(), canvas, camera, bg);
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view.Paint();
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view.SaveAs("volume.png");
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// Compute an isosurface:
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vtkm::filter::contour::Contour filter;
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// [min, max] of the tangle field is [-0.887, 24.46]:
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filter.SetIsoValue(3.0);
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filter.SetActiveField(fieldName);
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vtkm::cont::DataSet isoData = filter.Execute(tangleData);
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// Render a separate image with the output isosurface
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vtkm::rendering::Actor isoActor(
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isoData.GetCellSet(), isoData.GetCoordinateSystem(), isoData.GetField(fieldName), colorTable);
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// By default, the actor will automatically scale the scalar range of the color table to match
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// that of the data. However, we are coloring by the scalar that we just extracted a contour
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// from, so we want the scalar range to match that of the previous image.
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isoActor.SetScalarRange(actor.GetScalarRange());
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vtkm::rendering::Scene isoScene;
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isoScene.AddActor(isoActor);
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// Wireframe surface:
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vtkm::rendering::View3D isoView(isoScene, MapperWireframer(), canvas, camera, bg);
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isoView.Paint();
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isoView.SaveAs("isosurface_wireframer.png");
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// Smooth surface:
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vtkm::rendering::View3D solidView(isoScene, MapperRayTracer(), canvas, camera, bg);
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solidView.Paint();
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solidView.SaveAs("isosurface_raytracer.png");
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return 0;
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}
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```
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A minimal CMakeLists.txt such as the following one can be used to build this
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example.
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```CMake
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project(example)
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cmake_minimum_required(VERSION 3.12...3.15 FATAL_ERROR)
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project(VTKmDemo CXX)
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set(VTKm_DIR "/somepath/lib/cmake/vtkm-XYZ")
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#Find the VTK-m package
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find_package(VTKm REQUIRED QUIET)
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find_package(VTKm REQUIRED)
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add_executable(example example.cxx)
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target_link_libraries(example vtkm_cont vtkm_rendering)
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if(TARGET vtkm_rendering)
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add_executable(Demo Demo.cxx)
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target_link_libraries(Demo PRIVATE vtkm_filter vtkm_rendering vtkm_source)
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endif()
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```
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## License ##
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@ -229,11 +262,11 @@ See [LICENSE.txt](LICENSE.txt) for details.
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[VTK-m Coding Conventions]: docs/CodingConventions.md
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[VTK-m Doxygen latest]: https://docs-m.vtk.org/latest/index.html
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[VTK-m Doxygen nightly]: https://docs-m.vtk.org/nightly/
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[VTK-m download page]: http://m.vtk.org/index.php/VTK-m_Releases
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[VTK-m download page]: https://gitlab.kitware.com/vtk/vtk-m/-/releases
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[VTK-m git repository]: https://gitlab.kitware.com/vtk/vtk-m/
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[VTK-m Issue Tracker]: https://gitlab.kitware.com/vtk/vtk-m/-/issues
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[VTK-m Overview]: http://m.vtk.org/images/2/29/VTKmVis2016.pptx
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[VTK-m Users Guide]: http://m.vtk.org/images/c/c8/VTKmUsersGuide.pdf
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[VTK-m Users Guide]: https://gitlab.kitware.com/vtk/vtk-m-user-guide/-/wikis/home
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[VTK-m users email list]: http://vtk.org/mailman/listinfo/vtkm
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[VTK-m Wiki]: http://m.vtk.org/
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[VTK-m Tutorial]: http://m.vtk.org/index.php/Tutorial
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