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Merge topic 'fix-readme-example-code'

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ba030da1d remove confusing parts of the README example code
8dcd02422 fix README.md code example

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Kenneth Moreland <kmorel@sandia.gov>
Merge-request: !1959
This commit is contained in:
Vicente Bolea 2020-02-24 20:03:59 +00:00 committed by Kitware Robot
commit bd3256a2d6
1 changed files with 26 additions and 11 deletions
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README.md
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@ -155,6 +155,19 @@ Below is a simple example of using VTK-m to load a VTK image file, run the
Marching Cubes algorithm on it, and render the results to an image:
```cpp
#include <vtkm/Bounds.h>
#include <vtkm/Range.h>
#include <vtkm/cont/ColorTable.h>
#include <vtkm/filter/Contour.h>
#include <vtkm/io/reader/VTKDataSetReader.h>
#include <vtkm/rendering/Actor.h>
#include <vtkm/rendering/Camera.h>
#include <vtkm/rendering/CanvasRayTracer.h>
#include <vtkm/rendering/Color.h>
#include <vtkm/rendering/MapperRayTracer.h>
#include <vtkm/rendering/Scene.h>
#include <vtkm/rendering/View3D.h>
vtkm::io::reader::VTKDataSetReader reader("path/to/vtk_image_file");
vtkm::cont::DataSet inputData = reader.ReadDataSet();
std::string fieldName = "scalars";
@ -171,21 +184,10 @@ vtkm::cont::DataSet outputData = filter.Execute(inputData);
// compute the bounds and extends of the input data
vtkm::Bounds coordsBounds = inputData.GetCoordinateSystem().GetBounds();
vtkm::Vec<vtkm::Float64,3> totalExtent( coordsBounds.X.Length(),
coordsBounds.Y.Length(),
coordsBounds.Z.Length() );
vtkm::Float64 mag = vtkm::Magnitude(totalExtent);
vtkm::Normalize(totalExtent);
// setup a camera and point it to towards the center of the input data
vtkm::rendering::Camera camera;
camera.ResetToBounds(coordsBounds);
camera.SetLookAt(totalExtent*(mag * .5f));
camera.SetViewUp(vtkm::make_Vec(0.f, 1.f, 0.f));
camera.SetClippingRange(1.f, 100.f);
camera.SetFieldOfView(60.f);
camera.SetPosition(totalExtent*(mag * 2.f));
vtkm::cont::ColorTable colorTable("inferno");
// Create a mapper, canvas and view that will be used to render the scene
@ -205,6 +207,19 @@ view.Paint();
view.SaveAs("demo_output.pnm");
```
A minimal CMakeLists.txt such as the following one can be used to build this
example.
```CMake
project(example)
set(VTKm_DIR "/somepath/lib/cmake/vtkm-XYZ")
find_package(VTKm REQUIRED)
add_executable(example example.cxx)
target_link_libraries(example vtkm_cont vtkm_rendering)
```
## License ##