[vtkusers] ParallelProjection question

[Dov Mayzlish]

Hi Everyone,

I have a problem understanding how to interpret the size of the rendered
image.

I render an actor with ParallelProjection.
             camera->ParallelProjectionOn();
I define the clipping planes using
            this->ren->ComputeVisiblePropBounds( allBounds );
            this->ren->ResetCameraClippingRange( allBounds );
and the scale by:
            camera->SetParallelScale(zoom);


How can I know the size of the rendered image in the viewport in real world
coordinates, from these (or other) parameters?

Thanks,
Dov
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