Artefacts?

[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.

[glimpse]

looks like a scale issue =) try to tweak that ray epsilon.

[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... :/

[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 =)

[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