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artifacts with volume rendering [message #34137]

Wed, 26 February 2003 02:32

s[1]
Messages: 21
Registered: December 2002

Junior Member

Hi all,

under certain conditions, I encounter regular wave-like artifacts with
volume rendering:
I render an IDLgrVolume, rotated a little bit around x and y axis, so that
the top left front corner of the data set cube is about in the center of
the rendered image.
-> Everything works fine.
Then I divide the data set into 8 sub-cubes of equal size and set all
voxels in the top left front subcube to zero while not changing the
others - that's like cutting this subcube out of the volume.
When I now render the volume, a wave pattern appears on the cut surfaces.
The pattern varies when I rotate the volume, it disappears when the cut
surfaces are orthogonal to the viewing direction.

When I set the BOUNDS of the volume to cut away half of it at the some
position where one of the cut surfaces from the sub-cube was, I do not get
these artifacts.

Does anybody have an idea what causes these artifacts and how to avoid
them?

Thanks for all tips,

Sebastian

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By: s[1] on Wed, 26 February 2003 02:32

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