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# ColorGlyphs

VTKEx/Cxx/Visualization/ColorGlyphs

### Description

This example creates a red, green, and blue cube.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### Code

ColorGlyphs.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPointData.h>
    #include <vtkCubeSource.h>
    #include <vtkPolyData.h>
    #include <vtkPoints.h>
    #include <vtkGlyph3D.h>
    #include <vtkCellArray.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkUnsignedCharArray.h>

    // For compatibility with new VTK generic data arrays
    #ifdef vtkGenericDataArray_h
    #define InsertNextTupleValue InsertNextTypedTuple
    #endif

    int main(int, char *[])
    {
      // Create points
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0,0,0);
      points->InsertNextPoint(5,0,0);
      points->InsertNextPoint(10,0,0);

      // Setup scales. This can also be an Int array
      // char is used since it takes the least memory
      vtkSmartPointer<vtkUnsignedCharArray> colors =
        vtkSmartPointer<vtkUnsignedCharArray>::New();
      colors->SetName("colors");
      colors->SetNumberOfComponents(3);
      unsigned char r[3] = {255,0,0};
      unsigned char g[3] = {0,255,0};
      unsigned char b[3] = {0,0,255};
      colors->InsertNextTupleValue(r);
      colors->InsertNextTupleValue(g);
      colors->InsertNextTupleValue(b);

      // Combine into a polydata
      vtkSmartPointer<vtkPolyData> polydata =
        vtkSmartPointer<vtkPolyData>::New();
      polydata->SetPoints(points);
      polydata->GetPointData()->SetScalars(colors);

      // Create anything you want here, we will use a cube for the demo.
      vtkSmartPointer<vtkCubeSource> cubeSource =
        vtkSmartPointer<vtkCubeSource>::New();

      vtkSmartPointer<vtkGlyph3D> glyph3D =
        vtkSmartPointer<vtkGlyph3D>::New();
      glyph3D->SetColorModeToColorByScalar();
      glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
      glyph3D->SetInputData(polydata);
      glyph3D->ScalingOff();
      glyph3D->Update();

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(glyph3D->GetOutputPort());
      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // Visualize
      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(1,1,1); // Background color white

      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ColorGlyphs)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersCore
      vtkFiltersSources
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ColorGlyphs: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(ColorGlyphs MACOSX_BUNDLE ColorGlyphs.cxx )
      target_link_libraries(ColorGlyphs PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ColorGlyphs MACOSX_BUNDLE ColorGlyphs.cxx )
      target_link_libraries(ColorGlyphs PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ColorGlyphs
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ColorGlyphs

Click here to download ColorGlyphs and its CMakeLists.txt file. Once the tarball ColorGlyphs.tar has been downloaded and extracted,

    cd ColorGlyphs/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:

    ./ColorGlyphs

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.