The reflection and refraction of Arnold glass material is wrong

[2497373304]

 Hi guys. I have been learning Arnold recently and encountered some problems when making glass materials.
  When rendering transparent products with thickness, Arnold will have an extra layer of reflection compared to other renderers. Normally it should be two layers, but in Arnold there will be a three layer effect.
  I tried adding the Arnold tag, as well as changing the internal reflection in the material. The result is still wrong. I found that when the "Transparency Depth" in the render settings is 0, the reflection results obtained are correct. But this transparent material will turn black.
  I uploaded the project and pictures，Do you guys have any solutions?

 

 

[peter_horvath]

Thanks for reporting. This is a known problem and it's on our roadmap to fix this, but can not give any ETA at the moment. You can try to disable Internal Reflections under the Advanced group of the standard surface shader as a workaround, but I'm not sure it will fully solve the problem.

[daniel]

Works fine here with Rombo Tools RomboRefract shader

[2497373304]

Thank you, I hope the new version can solve this problem, keep going!

[kcchen01]

Hello, I would like to ask if this problem has been fixed. My work is mainly to render glass bottles and other products. This problem makes my highlight area unclean. I hope my highlight area has clean edges. If I use the disabled internal refraction, the other parts of the glass will not be as bright as before. Even if I increase the specular value in the ray depth, the effect is not good enough.

[peter_horvath]

Unfortunately, the issue has not been fixed yet. It's part of a bigger shading task that is currently worked on, but I can not give you an ETA. For reference, the issue is logged as ARNOLD-5649 internally, that's the ticket number you have to look for in release notes.

[daniel]

You could still try rombo shaders right now.

[1464657462]

Hello, Happy New Year, sorry to bother you. Does this BUG in Arnold affect MTOA?

[peter_horvath]

> Does this BUG in Arnold affect MTOA?

Yes, the issue is in the Arnold core, MtoA behaves the same.

[kcchen01]

I haven't tested thicker glass or other IORs, but from my existing models (some PET BOTTLE), this kind of reflection should not appear. You can try it with some pet bottles. You can put the light on one side, and the reflection may be behind the mirror direction, but it will not exist on the front and back of the same side.