[vtkusers] PROJECTION & VIEW Matrix from vtkPerspectiveTransform

[Sergio Aguirre]

Hi everyone,

I am attempting to implement some specific PROJECTION and VIEW matrices.

Reviewing the vtkCamera class documentation you can call
getProjectionTransformMatrix, however, this returns a
vtkPerspectiveTransform class object (vtkTransform for the VIEW matrix).

When debugging single step on a simple example (
http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/Tutorial/Step4/Cxx/Cone4.cxx;h=d6ae8f5a4cd3e0b19328effea5d97883d369efe4;hb=HEAD)
I was only able to notice the vtkPerspectiveTransform objects but not their
matrices...

Can anyone suggest how I could interrogate the final PROJECTION and VIEW
matrix just before the render is actually done?

I'd like to make sure I am setting up everything correctly to some OpenGL
code I have.

Hope you can help,

Sergio
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