Houdini: 1. Added ggx, gtr and ashikhmin vex functions to houdini/setup/vex/CVex. 2. Added bsdf-v1.1.1.otl to houdini/setup/otls. This otl contains all the physically correct shaders (including the disney material) from the BRDF Bonanza thread on odforce. The ggx, gtr and ashikhmin shaders of the otl are NOT to be used. There are modified versions of those in the helga_bsdfs.otl that are functioning on the render farm. The disney material from this otl however seems to work correct on the renderfarm and can be used.