Hi as title says I’m trying to render a scene, in cycles, with a material index pass but when I render (GPU) I have only a black frame in material index pass.
When I switch to CPU mode it’s ok.
It’s a known limitation or a bug?
Thanx
GPU Render Pass only Cuda Shader Model 1.3 + (if i remember correct)
Your GPU is too old 
NOt nice, but known.
Thank you bashi for the info, yes my card it’s bit old GTX 260,
so it’s time to upgrade I think.
Thanks again
don’t worry, my macbook pro from 2010 has the same “issue”