23 #ifndef vtkOpenGLCamera_h 
   24 #define vtkOpenGLCamera_h 
   26 #include "vtkRenderingOpenGLModule.h"  
abstract specification for renderers 
virtual void UpdateViewport(vtkRenderer *vtkNotUsed(ren))
Update the viewport. 
a simple class to control print indentation 
a virtual camera for 3D rendering 
virtual void Render(vtkRenderer *)
This method causes the camera to set up whatever is required for viewing the scene. 
void PrintSelf(ostream &os, vtkIndent indent)
Methods invoked by print to print information about the object including superclasses. 
static vtkCamera * New()
Construct camera instance with its focal point at the origin, and position=(0,0,1).