Weird Shadow?

[Mugz]

Anyone know why I have this obnoxiously fake shadow no matter what Import or use for geometry? It stays like this no matter what exposure or gamma setting I use and it's like this for every render! I don't understand what is happening here?

Below is the same image at different exposure settings to highlight the problem. I dont get it because if I import anything into the stand alone it's perfect but for some reason in rhino this is what is below EVERY object so I can never render anything here...

Thanks

[formatio]

Hi

How big are those balls?

[Mugz]

Large one is 14mm

[formatio]

Hmm - if the scene is lit with hdri - try to mess with it's gamma slider.
My first guess was also epsilon slider - but if balls are 14mm that should not be the case (won't hurt to try thou)

[face_off]

For a scene that small you will need to use a very small ray epsilon (0.00001). https://docs.otoy.com/Rhino/?page_id=437

Paul

[Mugz]

Yup that fixed it thanks guys, I had to set it to .0001 but now I'm getting this craziness... Could octane be any LESS intuitive...

[face_off]

Looks like you need to reduce the GI Clamp. Pls refer to the Octane Note link in my signature.

Paul

[prehabitat]

Looks like you need to reduce the GI Clamp. Pls refer to the Octane Note link in my signature.

Paul

great FAQ Paul; don't think I've looked at this for a while:

what does this mean 4) Reduce Kernel->GI Clamp (Try 1. Otoy recommend a GI Clamp of ~10-100x the inverse of the exposure) ??

can you give a real-world example (ie with a usable exposure?)

[face_off]

what does this mean 4) Reduce Kernel->GI Clamp (Try 1. Otoy recommend a GI Clamp of ~10-100x the inverse of the exposure) ??

can you give a real-world example (ie with a usable exposure?)

If you have exposure = 10, then GI Clamp would be 1-10. In general, I think people start with exposure at 1, so the GI Clamp starting point would be between 10 and 100.

Paul

[Micha3D]

Yup that fixed it thanks guys, I had to set it to .0001 but now I'm getting this craziness... Could octane be any LESS intuitive...

I ask me what the reason for the noise is. You get the noise by changing the ray epsilon only? So far I understand the GI clamp cut the light calculation. But maybe it's better know the reason - to much contrast by tiny high intensive lights at the HDRI env? Or is it caused by the small ray epsilon?