ModifiedBSPTreeIntersectWithLine

VTKEx/Cxx/DataStructures/ModifiedBSPTreeIntersectWithLine

Question

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Code

ModifiedBSPTreeIntersectWithLine.cxx

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkModifiedBSPTree.h>
#include <vtkSphereSource.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  // Create the tree
  vtkSmartPointer<vtkModifiedBSPTree> bspTree =
    vtkSmartPointer<vtkModifiedBSPTree>::New();
  bspTree->SetDataSet(sphereSource->GetOutput());
  bspTree->BuildLocator();

  // Inputs
  double p1[3] = {-2,0,0};
  double p2[3] = {2,0,0};
  double tolerance = .001;

  // Outputs
  double t; // Parametric coordinate of intersection (0 (corresponding to p1) to 1 (corresponding to p2))
  double x[3]; // The coordinate of the intersection
  double pcoords[3];
  int subId;

  // Note: for a typical use case (ray-triangle intersection), pcoords and subId will not be used
  vtkIdType iD = bspTree->IntersectWithLine(p1, p2, tolerance, t, x, pcoords, subId);

  std::cout << "iD: " << iD << std::endl;
  std::cout << "t: " << t << std::endl;
  std::cout << "x: " << x[0] << " " << x[1] << " " << x[2] << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ModifiedBSPTreeIntersectWithLine)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersFlowPaths
  vtkvtkFiltersSources QUIET)
if (NOT VTK_FOUND)
  message("Skipping ModifiedBSPTreeIntersectWithLine: ${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(ModifiedBSPTreeIntersectWithLine MACOSX_BUNDLE ModifiedBSPTreeIntersectWithLine.cxx )
  target_link_libraries(ModifiedBSPTreeIntersectWithLine PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ModifiedBSPTreeIntersectWithLine MACOSX_BUNDLE ModifiedBSPTreeIntersectWithLine.cxx )
  target_link_libraries(ModifiedBSPTreeIntersectWithLine PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ModifiedBSPTreeIntersectWithLine
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ModifiedBSPTreeIntersectWithLine

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

cd ModifiedBSPTreeIntersectWithLine/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:

./ModifiedBSPTreeIntersectWithLine

WINDOWS USERS

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