Blender Git Loki

Added subsurface radius parameter to control the per color channel
effection radius of the subsurface scattering.

Rearranged the inputs of the shader.

Put spaces in the parameter names of the shader node

Removed code that isn't in use anymore

Code style cleanup

Merge branch 'master' into cycles_disney_brdf

Switching between OSL and SVM is more consistant now when using Disney
BSDF.

There were some minor differences in the OSL implementation, e.g. the
refraction roughness was missing.

Fixed a bug that caused transparency to be always white when using OSL and
selecting GGX as distribution of the Disney BSDF

Merge branch 'master' into cycles_disney_brdf

Cleanup the Disney BSDF implementation and removing unneeded files.

Unified the OSL implementation of the Disney clearcoat as a simple
microfacet shader like it was previously done in SVM

Enhanced performance for Disney materials without subsurface scattering

Fixed a bug in the Disney BSDF that caused specular reflections to be too
bright and diffuse is now reacting to the roughness again

- A normalization for the fresnel was missing which caused the specular
reflections to become too bright for the single-scatter GGX
- The roughness value for the diffuse BSSRDF part has always been
overwritten and thus always 0
- Also the performance for refractive materials with roughness=0.0 has
been improved

Added selection field to the Disney BSDF node for switching between
"Multiscatter GGX" and "GGX"

In the "GGX" mode there is an additional parameter for changing the
refraction roughness for materials with smooth surfaces and rough interns
(e.g. honey). With the "Multiscatter GGX" this effect can't be produced at
the moment and so here will be no separation of the two roughness values.

Merge branch 'master' into cycles_disney_brdf

Implemented the OSL part of the Disney shader

Merge branch 'master' into cycles_disney_brdf

Fresnel in the microfacet multiscatter implementation improved

Fixed refraction roughness problem (refractions were always 100% rough)
and set IOR of clearcoat to 1.5

Merge branch 'master' into cycles_disney_brdf