Kubuntu x64 14.10
62b13c6 (From Git)
I'm working on a project for medical instruments.
I found a problem with refraction materials. I don't know exactly if this worked fine in some version.
The refraction shaders (glass and refraction+glossy) have black artifacts in some faces. This problem becomes worse when roughness appear, because this is expanded.
The black artifacts give less credibility to the realism, it's a huge problem.
I tried with more light paths bounces... but without success.
I solve this with image edition (krita), it's a patch, but is not the best solution.
Other alternative solution is set the subsurf to high values!.
In the image example you can see model, a simple cube with 2 extrude and bevel.
Environment white, for reduce the error percentage.
High values to light paths. Integrator in Branched.
The model haven't subsurface.
I leave 2 settings ready, glass and refraction + glossy.
Thanks a bunch!