ColorGlyphs

VTKExamples/Cxx/Visualization/ColorGlyphs


Description

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

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
  vtkRenderingCore
  vtkRenderingFreeType
  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.