[vtkusers] Issues with pixelation in volume render

[Dženan Zukić]

I am experiencing a similar problem with GPU Raycaster. I have linear
interpolation turned on (it helps somewhat), but when I view it from an
angle close to being parallel to the image slices I see similar
discontinuity artifacts in the slicing direction. My images have large
inter-slice spacing (low Z resolution). I have found no solution so far.
You are not alone :)

On Mon, Dec 5, 2011 at 16:15, Jim Geach <jimgeach at physics.mcgill.ca> wrote:

>
> 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
>
>
>
> ---
> 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
>
>
>
>
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