Author Topic: MDL material_volume varying absorption_coefficient supported?  (Read 56 times)


In MDL, I am trying to drive material_volume->absorption_coefficient with a 2d texture but it breaks (renders as if value is 0) whenever I do this. I am able to use a constant value without issue.  Is a variable absorption_coefficient not supported?


Hello Micah,

Thank you for bringing this issue to our attention.

Driving variable absorption coefficients using a 2D texture is not supported by Iray, as mentioned in this thread from the Nvidia Developer forum. I imagine you started that thread as well?

Best regards,

QA Analyst
Substance Designer Team