[vtkusers] Issues with pixelation in volume render

[Jim Geach]

Dear all, 

I'm volume rendering some large data cubes (using a FixedPointVolumeMapper, Composite mode), and getting an unsatisfactory pixelation effect in some part of the images that are obtained via RenderLargeImage (we want images that are larger than the device size).

I attach an example of the sort of effect I'm talking about, and wondered if anyone knew why this is happening, and if there is a way to fix it.

I must add that I'm guessing its something to do with the camera parameters I'm using - for various reasons I want to use a wide camera angle, with:

cam.SetViewAngle(60)
cam.UseHorizontalViewAngleOn()

I'm wondering if the problems with the images have something to do with distortion introduced in the rendering because of this. The pixelation doesn't affect the whole image however.

Best, Jim

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Dr James Geach
McGill University

Ernest Rutherford Building,
3600 Rue University, Montreal, QC

jimgeach at physics.mcgill.ca
514-398-1449
http://www.physics.mcgill.ca/~jimgeach