Blender Git Loki

Base color now applied again to the refraction of transparent Disney
materials

Added subsurface color parameter to the Disney shader

Improvement of the SSS in the Disney shader

* Now the bump normal is correctly used for the SSS.
* SSS in Disney uses the Disney diffuse shader

Better calculation of the Disney diffuse part

Now the values for NdotL und NdotV are clamped to 0.0f for a better look
when using normal maps

Now one can disable specular reflactions again by setting specular and
metallic to 0 (cracked this in the previous commit)

fixed the Disney SSS and cleaned the initialization of the Disney shaders

fixed an error that was caused by the missing LABEL_REFLECT in the Disney
diffuse shader

Rollback attempt to fix sss crashing, it prevented crash by disabling sss completely, thus useless

Add an undef for sc_next for safety

Attempt to fix Disney SSS

Added a roughness parameter for refractions (for scattering of the rays
within an object)

With this, one can create a translucent material with a smooth surface and
with a milky look.

The final refraction roughness has to be calculated using the surface
roughness and the refraction roughness because those two are correlated
for refractions. If a ray hits a rough surface of a translucent material,
it is scattered while entering the surface. Then it is scattered further
within the object. The calculation I'm using is the following:

RefrRoughnessFinal = 1.0 - (1.0 - Roughness) * (1.0 - RefrRoughness)

Disney BSDF is now supporting CUDA

Added parameters IOR and Transparency for refractions

With this, the Disney BRDF/BSSRDF is extended by the BTDF part.

Added an additional normal for the clearcoat

With this normal one can simulate a thin layer of clearcoat by applying a
smoother normal map than the original to this input

Switched to the improved subsurface scattering from Christensen and
Burley

Added Disney Sheen shader as a preparation to get to a BSSRDF

Merge branch 'cycles_disney_brdf' of git.blender.org:blender into cycles_disney_brdf

Conflicts:
intern/cycles/kernel/closure/bsdf_disney_clearcoat.h
intern/cycles/kernel/closure/bsdf_disney_diffuse.h
intern/cycles/kernel/closure/bsdf_disney_specular.h
intern/cycles/kernel/closure/bsdf_util.h
intern/cycles/kernel/osl/CMakeLists.txt
intern/cycles/kernel/osl/bsdf_disney_clearcoat.cpp
intern/cycles/kernel/osl/bsdf_disney_diffuse.cpp
intern/cycles/kernel/osl/bsdf_disney_specular.cpp
intern/cycles/kernel/osl/osl_closures.h
intern/cycles/kernel/shaders/node_disney_bsdf.osl
intern/cycles/render/nodes.cpp
intern/cycles/render/nodes.h

SVM and OSL are both working for the simple version of the Disney BRDF

Disney node can be used without SVM and started to cleanup the OSL implementation

There is still some wrong behavior for SVM for the Schlick Fresnel part at the
specular and clearcoat

Switched from a parameter struct for Disney parameters to ShaderClosure params