GaussianSplat

VTKExamples/Cxx/Filtering/GaussianSplat


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Question

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Code

GaussianSplat.cxx

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkContourFilter.h>
#include <vtkGaussianSplatter.h>
#include <vtkSphereSource.h>

#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

int main(int, char *[])
{
  // Create points on a sphere
  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  vtkSmartPointer<vtkPolyData> polydata = 
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(sphereSource->GetOutput()->GetPoints());

  vtkSmartPointer<vtkGaussianSplatter> splatter = 
    vtkSmartPointer<vtkGaussianSplatter>::New();
  splatter->SetInputData(polydata);
  splatter->SetSampleDimensions(50,50,50);
  splatter->SetRadius(0.5);
  splatter->ScalarWarpingOff();

  vtkSmartPointer<vtkContourFilter> surface = 
    vtkSmartPointer<vtkContourFilter>::New();
  surface->SetInputConnection(splatter->GetOutputPort());
  surface->SetValue(0,0.01);

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(surface->GetOutputPort());

  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Visualize
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;

}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(GaussianSplat)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkIOXML
  vtkImagingHybrid
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping GaussianSplat: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(GaussianSplat MACOSX_BUNDLE GaussianSplat.cxx )
  target_link_libraries(GaussianSplat PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(GaussianSplat MACOSX_BUNDLE GaussianSplat.cxx )
  target_link_libraries(GaussianSplat PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS GaussianSplat
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build GaussianSplat

Click here to download GaussianSplat and its CMakeLists.txt file. Once the tarball GaussianSplat.tar has been downloaded and extracted,

cd GaussianSplat/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./GaussianSplat

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.