BCGSuite for MFC
virtual void CBCGPChartDiagram3D::OnBegin3DDraw ( CBCGPGraphicsManager pGM)

Called when 3D rendering is started.

This method is called by the chart when 3D rendering is being started. You can override this method for custom 3D drawing if you need any 3D objects to be displayed first (or if you need any additional initializations).

pGMA pointer to a graphics manager.