[vtkusers] Using parallel projection on vtkCamera

[Jothy]

Hi all,

I am trying to overlay a contour on a DICOM image. I am using
vtkRenderWindow with vtkInteractorStyleImage. When I move away from the
central slice the contours look enlarged slightly. I though this could be
fixed by setting ParallelProjectionOn() in vtkCamera. But the problem is the
contour only appears on the central plane and disappears when I scroll away
from that.


Whe should the parallel projectionOn called, after Render() or before that?

Thanks

Jothy
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