VTK/Examples/Cxx/GLUT

From KitwarePublic
< VTK‎ | Examples‎ | Cxx
Revision as of 04:58, 21 November 2012 by JPouderoux (talk | contribs) (vtkglut.cxx)

Jump to: navigation, search

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

#include <gl/glut.h>
#include "vtkConeSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkActor.h"
#include "vtkRenderer.h"

vtkRenderer *ren = NULL;
vtkRenderWindow *renWin = NULL;
 
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)
{ 	 
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
  glutInitWindowSize(640, 480);
  glutCreateWindow("VTK-GLUT Example");
  glutReshapeFunc(Reshape);
  glutDisplayFunc(Draw);

  vtkConeSource *cone = vtkConeSource::New();

  vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
  coneMapper->SetInputConnection( cone->GetOutputPort() );

  vtkActor *coneActor = vtkActor::New();
  coneActor->SetMapper( coneMapper );

  ren = vtkRenderer::New();
  ren->AddActor( coneActor );

  renWin = vtkRenderWindow::New();
  renWin->InitializeFromCurrentContext(); // here is the trick: associate the RenderWindow with the current OpenGL context created by GLUT
  renWin->AddRenderer( ren );
   
  glutMainLoop();
 
  cone->Delete();
  coneMapper->Delete();
  coneActor->Delete();
  ren->Delete();
  renWin->Delete();
 
  return 0;
}

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})