[vtkusers] derive a class form vtkRendere

[Obada Mahdi]

Hello Jalal!

jalal sadeghi wrote:
> I derived a class  from  vtkRendere.after using it i these message 
> appears : cannot instantiate abstract class  .

If, by any chance, you are working on an OpenGL-based renderer, you might want 
to subclass (or at least have a look at) vtkOpenGLRenderer, which resides in
Rendering/vtkOpenGLRenderer.{cxx,h}
in the VTK source tree.

> i see that DeviceRender=0  must be overridden but after  that the  
> message appears again.is <http://again.is>  there another function that 
> must be overridden

There are several other pure virtual functions defined in vtkViewport, the 
direct anchestor of vtkRenderer, most of which have to do with picking:
http://www.vtk.org/doc/nightly/html/classvtkViewport.html


HTH,

Obada