[vtkusers] Offscreen Rendering on Mac OS X

[Surajit Nundy]

Hi,
	There is a class vtkWin32OffscreenRenderWindow which allows Windows 
users to render offscreen. Is there an equivalent class (or workaround) 
on Mac OS X?  Something using Carbon or Cocoa would be preferable.

Thanks,
Surajit Nundy