[vtkusers] changing camera settings and lighting

[Gerrick Bivins]

Hi All,
I'm trying to understand how to create a left-handed coordinate system view with +z axis into the screen,
+y axis up and + x axis to the right and also have the lighting update appropriately.

One thing I've been wrestling with is accessing the underlying ModelViewMatrix (in OpenGL glMatrixMode(GL_MODELVIEW).
I thought I could set the ModelViewMatrix directly somehow but couldn't find what I needed .
I then saw that vtkCamera has a ModelViewMatrix but I'm am unable to set it properly. Seems that you can set
parts of the matrix and then the remainder is built assuming "right handedness", I think.

The closest I've gotten is by setting the ModelTransform (note, not ModelViewTransform!) which in I believe
is simply applying the transform to the data. This however mucks up the lighting and various combinations of
vtkReverseSense and vtkPolyDataNormal settings didn't seem to make a difference. Lighting wasn't correct, ie dark surfaces,
backside culled etc.
Any examples out there of how to setup a  left handed coordinate system view?
Thanks for any insight here.
Gerrick

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