[vtkusers] construct from vtkCamera from opengl Variables

[Elhassan Abdou]

Dear All,

I have a scene that I constructed using OpenGL and I want to rewrite the
code using VTK.
So I have view matrix (compose of, scaling in z, and translation in the
x,y,z).
I know I am rendering using perspective mode, so I have near plane, far
plane and horizontal  fov.

I tried to use vtkExternalOpenGL, but nothing is rendered.

Can anyone give me help on how to adjust vtkOpenGLCamera to use these
parameters to render the scene?

Regards
Elhassan
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