[vtkusers] a problem about projection from 3D points to 2D

[Hou Daniel]

dear sir,

I am doing structure and motion. I want to project the 3D points I obtain 
by reconstruction to 2D points on the image using equation x = P * X, and P 
is projective matrix. According to this euqation, the transformation should 
be only related to projective matrix P, for P = k*[R t]. However, I found 
that in order to get proper transformation I have to set the ViewAngle 
value through:
                 objectRen->GetActiveCamera()->SetViewAngle()
So, could you tell me whether the projection is only related to projective 
matrix or any other factor? Thank you! 

Hou Dan

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