diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_anisotropic_bsdf.osl')
-rw-r--r-- | intern/cycles/kernel/shaders/node_anisotropic_bsdf.osl | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_anisotropic_bsdf.osl b/intern/cycles/kernel/shaders/node_anisotropic_bsdf.osl new file mode 100644 index 00000000000..3ecf5b46bef --- /dev/null +++ b/intern/cycles/kernel/shaders/node_anisotropic_bsdf.osl @@ -0,0 +1,53 @@ +/* + * Copyright 2011-2013 Blender Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License + */ + +#include "stdosl.h" + +shader node_anisotropic_bsdf( + color Color = 0.0, + string distribution = "Ward", + float Roughness = 0.0, + float Anisotropy = 0.0, + float Rotation = 0.0, + normal Normal = N, + normal Tangent = normalize(dPdu), + output closure color BSDF = 0) +{ + /* rotate tangent around normal */ + vector T = Tangent; + + if (Rotation != 0.0) + T = rotate(T, Rotation * M_2PI, point(0.0, 0.0, 0.0), Normal); + + /* compute roughness */ + float RoughnessU, RoughnessV; + float aniso = clamp(Anisotropy, -0.99, 0.99); + + if (aniso < 0.0) { + RoughnessU = Roughness / (1.0 + aniso); + RoughnessV = Roughness * (1.0 + aniso); + } + else { + RoughnessU = Roughness * (1.0 - aniso); + RoughnessV = Roughness / (1.0 - aniso); + } + + if (distribution == "Ashikhmin-Shirley") + BSDF = Color * ashikhmin_shirley(Normal, T, RoughnessU, RoughnessV); + else + BSDF = Color * ward(Normal, T, RoughnessU, RoughnessV); +} + |