OBBTreeIntersectWithLine
VTKExamples/Cxx/DataStructures/OBBTreeIntersectWithLine
Description¶
vtkOBBTree returns ALL intersections with a line and the dataset. If you want the closest intersection, you must manually find it. In this example, we create a sphere and intersect a single line with it.
Code¶
OBBTreeIntersectWithLine.cxx
#include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkPointData.h> #include <vtkLine.h> #include <vtkOBBTree.h> int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->Update(); // Create the locator vtkSmartPointer<vtkOBBTree> tree = vtkSmartPointer<vtkOBBTree>::New(); tree->SetDataSet(sphereSource->GetOutput()); tree->BuildLocator(); // Intersect the locator with the line double lineP0[3] = {0.0, 0.0, 0.0}; double lineP1[3] = {0.0, 0.0, 2.0}; vtkSmartPointer<vtkPoints> intersectPoints = vtkSmartPointer<vtkPoints>::New(); tree->IntersectWithLine(lineP0, lineP1, intersectPoints, NULL); std::cout << "NumPoints: " << intersectPoints->GetNumberOfPoints() << std::endl; // Display list of intersections double intersection[3]; for(int i = 0; i < intersectPoints->GetNumberOfPoints(); i++ ) { intersectPoints->GetPoint(i, intersection); std::cout << "Intersection " << i << ": " << intersection[0] << ", " << intersection[1] << ", " << intersection[2] << std::endl; } return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(OBBTreeIntersectWithLine) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(OBBTreeIntersectWithLine MACOSX_BUNDLE OBBTreeIntersectWithLine.cxx) target_link_libraries(OBBTreeIntersectWithLine ${VTK_LIBRARIES})
Download and Build OBBTreeIntersectWithLine¶
Danger
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Click here to download OBBTreeIntersectWithLine and its CMakeLists.txt file. Once the tarball OBBTreeIntersectWithLine.tar has been downloaded and extracted,
cd OBBTreeIntersectWithLine/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:
./OBBTreeIntersectWithLine
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.