GPU rendering transparent material error

[RaynerR]

When rendering transparent material highlights in GPU mode, unexplained black spots may appear.Normal rendering in CPU mode.

GPU:

CPU:

[lee_griggs]

What are the sampling settings for each?

How many light samples?

Can you post a scene link here?

[RaynerR]

Thank you for your reply. This is a simple scene file

[lee_griggs]

Thanks for the scene. This is a known issue with glass and GPU.

[thiago.ize · Accepted solution]

This is likely due to GPU not allowing for ray splitting so sometimes an AA sample will reflect off the glass and other times it will refract and go through the glass. If you increase AA the image should eventually look correct.

[RaynerR]

Thank you for your answer. Adding camera AA can make it correct, but using this method in the project would increase rendering time significantly，thanks.