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
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.