OTOY Forums

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

Hi

How big are those balls?

Large one is 14mm

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)

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

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...

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

Paul

face_off wrote: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?)

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

Mugz wrote: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?