Blender Git Loki

Implemented the fresnel in the multi-scatter GGX for the Disney BSDF

- The specular/metallic part uses the multi-scatter GGX
- The fresnel of the metallic part is controlled by the specular value
- The color of the reflection part when using transparency can be
controlled by the specularTint value

Merge branch 'master' into cycles_disney_brdf

Implemented the Disney clearcoat as a variation of the microfacet bsdf,
removed the transparency roughness again and added an input for
anisotropic rotations

Merge branch 'master' into cycles_disney_brdf

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