subclassing vtkCamera

[Matt Clarkson]

Hi there,
	how am I meant to create sub classes of vtkCamera.
I want to add some functionality to it, but I have just
been looking through the source code, and I see
how vtkCamera is created with vtkGraphicsFactory,
and it actually creates an instance of vtkOpenGLCamera etc.

Whats the `correct' way to do it.

Thanks in advance

Matt

-- 
Computational Imaging Science Group                
Radiological Sciences,                                  
Guy's Hospital                           
London Bridge                       
London                                                                      
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