(Resolved) [HOU-1193] Refraction issue with production rendering on CPU

V-Ray for Houdini V-Ray for Houdini :: Issues
1

Hi

I have a glass bowl in my scene, with a simple glass material. It renders fine with IPR, but there is an issue with production rendering where edges appear black

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The GPU engine can render that fine as well, with both IPR and production rendering. This only happens on CPU

Scene file here,

https://drive.google.com/file/d/1ekg…ew?usp=sharing

Houdini 17.5.380
Latest Nightly

Best,
Muhammed

2

Hello @Muhammed_Hamed , I’ve reproduce the problem and it’s not Houdini related, same thing in maya too. I’ll make an issue about it and will inform you when I know something more.

3

Thanks Georgy!

And if you know a workaround that would be great, for now I will use the GPU engine

4

Yes, I just found the workaround, you need to reduce “Max Depth” in the glass material > Refraction > Advanced to a smaller value, it works well with 5.

5

Ya, the problem happens with Max Depth higher than 5
The visual difference is massive though, 24 Max Depth is minimum I use for glass to look good

I will see how it goes with 5, but most likely it won’t be enough

Thanks for your help!

6

Try to increase “global max depth” in VRay ROP > Options > Materials, it looks like the option is used even if it’s not enabled !

7

@chakarov You are a legend sir
works nicely now!
I also use Vray for Maya.. you said this issue is present there?
Do I need to report that?

8

The difference between using 5 and 24 Max Depth is huge, even with just a simple bowl that I uploaded for you. You can see how the edge looks very realistic with 24

9

You do not need to report it in V-Ray for maya, once we found where the problem comes from, we will fix it.