[vtk-developers] rendering error

[joris]

int RenderTranslucentPolygonalGeometry(vtkViewport* viewport){    int count = 0;     if (m_pcActor->GetVisibility())    {             if(viewport != NULL)             {                    count = m_pcActor->RenderTranslucentPolygonalGeometry(viewport);             }    }      return count;}    Hi, When i execute the above code I get this error: error:Access violation reading location ........... Does anybody know how to solve this? Thanks! 		 	   		  
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