Artifacts in sclera surface

[wader]

Hi Folks,
Using latest v4 standard license Octane plugin with Daz 4.12 and the model P3D May ( https://www.daz3d.com/p3d-may ), I am seeing weird artifacts in the sclera surface/material in both eyes. There are both shared and unique artifacts between the left and right eyes, as well. I've hidden all other items from the scene except for the eye sclera, examined the texture files, compared render outputs to both Daz' Iray and an export to .DAE in Blender with Cycles and only the Daz Octane plugin is showing these strange artifacts.

Daz Iray test:

Daz Octane test:

Daz Octane test (all eye surfaces, inside view):

Ideas on how to prevent these artifacts would be welcome.

[face_off]

Hi. You can debug this by rendering out each render pass, and determining which pass the artifacts are being rendered in. That may solve your issue. Otherwise, can you please export the scene from the above screenshots to an ORBX file and send it to me?

Thanks

Paul

[wader]

Thanks Paul, PM sent.

It appears that the wireframe pass shows those artifacts, yet the wireframe looks clean in Daz and in .obj or .dae exports of the scene. It seems that whatever output Daz is sending of the scene to Octane, those artifacts are somehow being generated in the process on either end.

Is there something - an intermediate state, perhaps - between Daz and Octane processes which might need to be reset and could be affecting their communications of the scene mesh for rendering?

[face_off]

Hi. Thanks for sending through the ORBX.

If you set the ray epsilon to 0.000001 it resolves the issue. Right clicking with the material picker in Octane Standalone shows there are 3 layers of geometry there, and I suspect 2 of them have very close vertices, resulting in the artifacts.

Thanks

Paul

[wader]

Thank you!

That same setting value also cured circular-shaped artifacts in other eyes from the same Developer, which is a nice bonus.

Should I be aware of any side-effects that 0.000001 for Ray Epsilon might cause for other objects in the scene?

[face_off]

Should I be aware of any side-effects that 0.000001 for Ray Epsilon might cause for other objects in the scene?

A very small ray epsilon may cause artifacts of very large polygons. In general, most DAZStudio props/figures are quite high resolution, so this is generally not a problem.

Paul