VTK/Examples/Cxx/GLUT

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Revision as of 07:20, 21 November 2012 by JPouderoux (talk | contribs) (vtkglut.cxx)

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This page shows an example of how to use the new method vtkRenderWindow::InitializeFromCurrentContext() to associate a vtkRenderWindow instance to an existing window and activated OpenGL context. By using this method, VTK do not create the rendering container nor the OpenGL context so a vtkRenderWindow and thus VTK can be easily embedded in an existing graphical application.

The following code shows how to embed a VTK RenderWindow in a very basic GLUT based application.

vtkglut.cxx

#ifndef __APPLE_CC__
#include <gl/glut.h>
#else
#include <glut.h>
#endif
#include "vtkConeSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkNew.h"

vtkNew<vtkRenderer> ren;
vtkNew<vtkRenderWindow> renWin;

void Reshape(int width, int height)
{ 	 
  renWin->SetSize(width, height);
} 	 

void Draw()
{ 	
  renWin->Render();
  ren->GetActiveCamera()->Azimuth( 1 );
  glutPostRedisplay();
}

int main( int argc, char **argv)
{
  // GLUT initialization
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
  glutCreateWindow("VTK-GLUT Example");
  glutReshapeFunc(Reshape);
  glutDisplayFunc(Draw);

  // Creation of a simple VTK pipeline
  vtkNew<vtkConeSource> cone;

  vtkNew<vtkPolyDataMapper> coneMapper;
  coneMapper->SetInputConnection( cone->GetOutputPort() );

  vtkNew<vtkActor> coneActor;
  coneActor->SetMapper( coneMapper.GetPointer() );

  ren->AddActor( coneActor.GetPointer() );

  renWin->InitializeFromCurrentContext(); // here is the trick: associate the RenderWindow with the current OpenGL context created by GLUT
  renWin->AddRenderer( ren.GetPointer() );
  
  // Let's start the main GLUT rendering loop
  glutMainLoop();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

project(VtkGlut CXX)

find_package(VTK REQUIRED)
find_package(GLUT REQUIRED)

include(${VTK_USE_FILE})

include_directories(${GLUT_INCLUDE_DIR})

add_executable(${PROJECT_NAME} vtkglut.cxx)

target_link_libraries(${PROJECT_NAME} ${VTK_LIBRARIES} ${GLUT_LIBRARIES})