OTOY Forums

*** SOLVED *** (Perhaps)

I started messing with some of the render settings and when I upped Ray epsilon, Eureka! The shadow problem was no more.

I found this post that explains what Ray epsilon does.
viewtopic.php?f=9&t=48425

For my example scene, upping the setting from the default of 0.0001 to 0.03 did the trick. I did notice, however, that increasing Ray epsilon does reduce the shadow density compared to the shadows when 'Cast illumination' is turned off.

I would appreciate any community or Otoy comments on the subject.

Please manual for that: https://docs.otoy.com/Cinema4DH/C4DPlug ... ghting.htm

Thanks aoktar. How does this relate to the problem with the shadow pass and emissive materials?

I reviewed the link you sent, but it refers to Direct Lighting. I am actually using Path Tracing when the error occurs. The section , in the link you sent, re: Path Tracing is unclear about Ray epsilon and simply states: "Ray Epsilon: See this topic." with no link to what "this topic" is.

Again, I just stubbled into the Ray epsilon setting that seemed to have an effect on the shadow pass problem. I would really like to understand how to fix the shadow pass problem when using emissive materials or have confirmation that this is a bug that will be addressed in a future update.

Thanks again.

FYI, this problem still exists. Any feedback on what is going on here and how to fix it?
--
POSTED TO SOON!

It looks like there are different options now in Emission settings. Turning OFF "Cast shadows" fixes the problem with no changes to Ray Epsilon required.