[vtkusers] problems with camera and lighting

[Chris Alvino]

Hi, 

I have a render window and I need to manually set the position of the camera 
to a specific absolute position along a (non-standard) axis of rotation.  
(Setting it to a relative position as with the command camera->Azimuth() for 
instance will not suffice.)

I am able to calculate the camera transformation matrix for this position, but 
when I set I calculate it (properly) and set the view transformation matrix 
accordingly, I have some problems upon rendering:

1) The light does not move with the camera.  The light stays where it was 
before I changed the camera and I get undesirable lighting affects.  I want 
the light to stay with the camera, however, when trying to change the light 
transformation matrix or when I use the Headlight or CameraLight mode.. I get 
the same problem.  Furthermore, 
renderer->UpdateLightsGeometryToFollowCamera() does not accomplish this goal 
either.

2) When I try to do a screen capture of the render window with the camera at 
this new position, the screen capture resorts to the last view shown by the 
render window interactor.

3) There is an error when I chance the matrix.  
Warning: In /usr/local/src/VTK/Common/vtkTransform.cxx, line 202
vtkTransform (0x8180ba8): InternalUpdate: doing hack to support legacy code.  
This is deprecated in VTK 4.2.  May be removed in a future version.


Based on this, I believe that changing the matrix is the wrong thing to do in 
order to accomplish what I want to accomplish.

Can anyone shed light (no pun intended) on this issue?

Thanks,
Chris



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