OBBTreeExtractCells
VTKExamples/Cxx/DataStructures/OBBTreeExtractCells
Code
OBBTreeExtractCells.cxx
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPoints.h>
#include <vtkIdList.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkLine.h>
#include <vtkLineSource.h>
#include <vtkExtractCells.h>
#include <vtkOBBTree.h>
#include <vtkPolyDataMapper.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetPhiResolution(7);
sphereSource->SetThetaResolution(15);
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] = {-0.6, -0.6, -0.6};
double lineP1[3] = {.6, .6, .6};
vtkSmartPointer<vtkPoints> intersectPoints =
vtkSmartPointer<vtkPoints>::New();
vtkSmartPointer<vtkIdList> intersectCells =
vtkSmartPointer<vtkIdList>::New();
double tol = 1.e-8;
tree->SetTolerance(tol);
tree->IntersectWithLine(lineP0, lineP1,
intersectPoints,
intersectCells);
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 << "\tPoint Intersection " << i << ": "
<< intersection[0] << ", "
<< intersection[1] << ", "
<< intersection[2] << std::endl;
}
std::cout << "NumCells: " << intersectCells->GetNumberOfIds()
<< std::endl;
vtkIdType cellId;
for(int i = 0; i < intersectCells->GetNumberOfIds(); i++ )
{
cellId = intersectCells->GetId(i);
std::cout << "\tCellId " << i << ": "
<< cellId << std::endl;
}
// Render the line, sphere and intersected cells
vtkSmartPointer<vtkLineSource> lineSource =
vtkSmartPointer<vtkLineSource>::New();
lineSource->SetPoint1(lineP0);
lineSource->SetPoint2(lineP1);
vtkSmartPointer<vtkPolyDataMapper> lineMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
lineMapper->SetInputConnection(lineSource->GetOutputPort());
vtkSmartPointer<vtkActor> lineActor =
vtkSmartPointer<vtkActor>::New();
lineActor->SetMapper(lineMapper);
vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> sphereActor =
vtkSmartPointer<vtkActor>::New();
sphereActor->SetMapper(sphereMapper);
sphereActor->GetProperty()->SetRepresentationToWireframe();
sphereActor->GetProperty()->SetColor(0.89,0.81,0.34);
vtkSmartPointer<vtkExtractCells> cellSource =
vtkSmartPointer<vtkExtractCells>::New();
cellSource->SetInputConnection(sphereSource->GetOutputPort());
cellSource->SetCellList(intersectCells);
vtkSmartPointer<vtkDataSetMapper> cellMapper =
vtkSmartPointer<vtkDataSetMapper>::New();
cellMapper->SetInputConnection(cellSource->GetOutputPort());
vtkSmartPointer<vtkActor> cellActor =
vtkSmartPointer<vtkActor>::New();
cellActor->SetMapper(cellMapper);
cellActor->GetProperty()->SetColor(1.0, 0.3882, 0.2784);
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(lineActor);
renderer->AddActor(sphereActor);
renderer->AddActor(cellActor);
renderer->SetBackground(.4, .5, .6);
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(OBBTreeExtractCells)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(OBBTreeExtractCells MACOSX_BUNDLE OBBTreeExtractCells.cxx)
target_link_libraries(OBBTreeExtractCells ${VTK_LIBRARIES})
Download and Build OBBTreeExtractCells
Click here to download OBBTreeExtractCells and its CMakeLists.txt file. Once the tarball OBBTreeExtractCells.tar has been downloaded and extracted,
cd OBBTreeExtractCells/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:
./OBBTreeExtractCells
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.