ColorCellsWithRGB
VTKExamples/Cxx/PolyData/ColorCellsWithRGB
Description¶
This example shows how to assign specific colors to individual cells of a polydata. This example stores the cell data as rgb triples.
Code¶
ColorCellsWithRGB.cxx
#include <vtkSmartPointer.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkMath.h> #include <vtkUnsignedCharArray.h> #include <vtkCellData.h> #include <vtkPolyData.h> #include <vtkPlaneSource.h> int main(int , char *[]) { // Provide some geometry int resolutionX = 5; int resolutionY = 3; vtkSmartPointer<vtkPlaneSource> aPlane = vtkSmartPointer<vtkPlaneSource>::New(); aPlane->SetXResolution(resolutionX); aPlane->SetYResolution(resolutionY); aPlane->Update(); // Create cell data vtkMath::RandomSeed(8775070); // for reproducibility vtkSmartPointer<vtkUnsignedCharArray> cellData = vtkSmartPointer<vtkUnsignedCharArray>::New(); cellData->SetNumberOfComponents(3); cellData->SetNumberOfTuples(aPlane->GetOutput()->GetNumberOfCells()); for (int i = 0; i < aPlane->GetOutput()->GetNumberOfCells(); i++) { float rgb[3]; rgb[0] = vtkMath::Random(64, 255); rgb[1] = vtkMath::Random(64, 255); rgb[2] = vtkMath::Random(64, 255); cellData->InsertTuple(i, rgb); } aPlane->GetOutput()->GetCellData()->SetScalars(cellData); // Setup actor and mapper vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(aPlane->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Setup render window, renderer, and interactor 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,.2,.3); renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ColorCellsWithRGB) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ColorCellsWithRGB MACOSX_BUNDLE ColorCellsWithRGB.cxx) target_link_libraries(ColorCellsWithRGB ${VTK_LIBRARIES})
Download and Build ColorCellsWithRGB¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ColorCellsWithRGB and its CMakeLists.txt file. Once the tarball ColorCellsWithRGB.tar has been downloaded and extracted,
cd ColorCellsWithRGB/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:
./ColorCellsWithRGB
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.