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Strange bumpmapping artifacts
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DoubleM Offline

Post: #1
Strange bumpmapping artifacts
Hi everyone
We get some weird artifacts on some objects when using bump-(/relief-)mapping.
The screenshot in the attachement shows more or less the worst case example.
It's less when I use not auto-generated bumpmaps but it's still there.
Any suggestions why it looks like this?
Thanks in advance,


Attached File(s) Image(s)
(This post was last modified: 12-07-2011 07:53 PM by DoubleM.)
12-07-2011 07:50 PM
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Fab4 Offline

Post: #2
RE: Strange bumpmapping artifacts
what do you mean with artifacts?
you have to see the difference between normal and bumpmaps. Bumpmaps generally just transfers height information and simulates a displacement in normal direction of the polygons (in this case)
if you just want to get an influence on the lightning/shadows only use a normalmap. it will still look bumpy.

If you were talking about the strange displacements on the wooden roof, it is exactly your problem.
If you set Bump Effect in meterial settings to zero, it will also disappear.
12-07-2011 09:49 PM
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Esenthel Offline

Post: #3
RE: Strange bumpmapping artifacts
bump effects work by real-time offseting texture coords in the shader. (this can be even more noticable in relief, which is not perfect)
solution is to:
-use parallax instead of relief
-reduce bump scale (this reduces bump scale overall)
-reduce bump texture intensities on edges of the mesh (when distortion is noticable), this reduces bump only in certain places (manually edit bump map)
-make texture to not jump quickly from one zone to another (hard to explain) but I guess you won't do it anyway (requires texture re-arrangement)
12-10-2011 01:37 PM
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