ModifiedBSPTreeIntersectWithLine
VTKExamples/Cxx/DataStructures/ModifiedBSPTreeIntersectWithLine
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 2.8)
PROJECT(ModifiedBSPTreeIntersectWithLine)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ModifiedBSPTreeIntersectWithLine MACOSX_BUNDLE ModifiedBSPTreeIntersectWithLine.cxx)
target_link_libraries(ModifiedBSPTreeIntersectWithLine ${VTK_LIBRARIES})
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.