Author Topic: MDL material turns black with when attaching diffuse_tranmission_bsdf to front  (Read 590 times)

When connecting a diffuse_transmission_bsdf to the frontside of an MDL material, the material turns black both on the front and on the backside.

Watch the bug being demonstrated here:

So reading the log file turned out to be helpful: Attaching two different diffuse_transmission_bsdfs is a bad idea since it generated two different transmissions  on both sides of the surface which will cause problems with the iray pathtracer. (As I learned this leads to different light interactions on the two sides which would cause the pathtracing algorithm to break)

Attaching one single transmissive bsdf is fine and will solve the issue.