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Cycles Glass BSDF broken on GPU
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I find that with the current master branch Glass Shaders do not work, but only on GPU. Appearance is mostly black, except for higher IORs (like >2), then something lighter appears, but completely different than with CPU render. I could bisect the bug down to commit 095a01a73a35d3af57573fc724d381bcca019f54, but I didn't figure out why this change should have an effect only on GPU.

GPU is GTX1080 on Linux 4.16.2 with CUDA

Blend File:



Event Timeline

Brecht Van Lommel (brecht) triaged this task as Needs Information from User priority.

Please use the new bug report template and provide all the requested information:

Particularly GPU, operating system and .blend file are important.

Okay, sure. Blend file and info OS/Hardware find above. To be precise about versions:

Not working:

  • Arch distro package 17:2.79.b.git2.0385b33f-15 (Splash screen hash 0385b33f0b3)
  • source rebuild of 815b1f24fa298784d9204b9248bc69ceb2b3d762
  • source rebuild of 095a01a73a35d3af57573fc724d381bcca019f54


  • source rebuild of b3afc8917cdeaa98ebfa3f2aa17e8c5a69fdb1e3
Bastien Montagne (mont29) raised the priority of this task from Needs Information from User to Normal.Jul 12 2018, 11:55 AM
Brecht Van Lommel (brecht) closed this task as Resolved.Mar 1 2019, 5:46 AM
Brecht Van Lommel (brecht) claimed this task.

This should be solved by now, we fixed a bug exactly like this.