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Artefacts?
Posted: Sun Nov 02, 2014 11:50 am
by voon
Not sure if this is Blender related or Octane.... but what are these ugly artefacts on my two colored cubes? It's just a normal diffuse material, nothing special. The objects are large ... red is 1 Kilometer in length.
I noticed this only happens, if I move the camera very far out.
Re: Artefacts?
Posted: Sun Nov 02, 2014 12:39 pm
by glimpse
looks like a scale issue =) try to tweak that ray epsilon.
Re: Artefacts?
Posted: Sun Nov 02, 2014 12:47 pm
by voon
Oh that fixed it ... I went from Ray Epsilon 0.0001 to 0.001 and it vanished. Do I have to fear any negative effects from making ray epsilon bigger? That's one of these "mythical parameters" that tell me absolutly nothing... :/
Re: Artefacts?
Posted: Sun Nov 02, 2014 1:42 pm
by glimpse
no, I actually know very little too. I had a lot of headache with this when I've started with Octane I just happy that it's done, I've managed to find solution with someOne's help in these forums too =)
Re: Artefacts?
Posted: Sun Nov 02, 2014 1:46 pm
by aoktar
hi,
Octane uses single precision(floatpoint math not double) on computation of surfaces. This can causes some loss on scenes which have very big values and very small values. Ray epsilon is a multiplier or parameter to adjust loss degree on float point math.
http://en.wikipedia.org/wiki/Floating_point
http://en.wikipedia.org/w/index.php?tit ... edirect=no