diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_principled_bsdf.osl')
| -rw-r--r-- | intern/cycles/kernel/shaders/node_principled_bsdf.osl | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_principled_bsdf.osl b/intern/cycles/kernel/shaders/node_principled_bsdf.osl new file mode 100644 index 00000000000..6870d479af3 --- /dev/null +++ b/intern/cycles/kernel/shaders/node_principled_bsdf.osl @@ -0,0 +1,120 @@ +/* + * Copyright 2011-2017 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" +#include "node_fresnel.h" + +shader node_principled_bsdf( + string distribution = "Multiscatter GGX", + color BaseColor = color(0.8, 0.8, 0.8), + float Subsurface = 0.0, + vector SubsurfaceRadius = vector(1.0, 1.0, 1.0), + color SubsurfaceColor = color(0.7, 0.1, 0.1), + float Metallic = 0.0, + float Specular = 0.5, + float SpecularTint = 0.0, + float Roughness = 0.5, + float Anisotropic = 0.0, + float AnisotropicRotation = 0.0, + float Sheen = 0.0, + float SheenTint = 0.5, + float Clearcoat = 0.0, + float ClearcoatRoughness = 0.03, + float IOR = 1.45, + float Transmission = 0.0, + float TransmissionRoughness = 0.0, + normal Normal = N, + normal ClearcoatNormal = N, + normal Tangent = normalize(dPdu), + output closure color BSDF = 0) +{ + float f = max(IOR, 1e-5); + float diffuse_weight = (1.0 - clamp(Metallic, 0.0, 1.0)) * (1.0 - clamp(Transmission, 0.0, 1.0)); + float final_transmission = clamp(Transmission, 0.0, 1.0) * (1.0 - clamp(Metallic, 0.0, 1.0)); + float specular_weight = (1.0 - final_transmission); + + vector T = Tangent; + + float m_cdlum = luminance(BaseColor); + color m_ctint = m_cdlum > 0.0 ? BaseColor / m_cdlum : color(0.0, 0.0, 0.0); // normalize lum. to isolate hue+sat + + /* rotate tangent */ + if (AnisotropicRotation != 0.0) + T = rotate(T, AnisotropicRotation * M_2PI, point(0.0, 0.0, 0.0), Normal); + + if (diffuse_weight > 1e-5) { + if (Subsurface > 1e-5) { + color mixed_ss_base_color = SubsurfaceColor * Subsurface + BaseColor * (1.0 - Subsurface); + BSDF = mixed_ss_base_color * bssrdf_principled(Normal, Subsurface * SubsurfaceRadius, 0.0, SubsurfaceColor, Roughness); + } else { + BSDF = BaseColor * principled_diffuse(Normal, Roughness); + } + + if (Sheen > 1e-5) { + color sheen_color = color(1.0, 1.0, 1.0) * (1.0 - SheenTint) + m_ctint * SheenTint; + + BSDF = BSDF + sheen_color * Sheen * principled_sheen(Normal); + } + + BSDF = BSDF * diffuse_weight; + } + + if (specular_weight > 1e-5) { + float aspect = sqrt(1.0 - Anisotropic * 0.9); + float r2 = Roughness * Roughness; + + float alpha_x = r2 / aspect; + float alpha_y = r2 * aspect; + + color tmp_col = color(1.0, 1.0, 1.0) * (1.0 - SpecularTint) + m_ctint * SpecularTint; + + color Cspec0 = (Specular * 0.08 * tmp_col) * (1.0 - Metallic) + BaseColor * Metallic; + + if (distribution == "GGX" || Roughness <= 0.075) { + BSDF = BSDF + specular_weight * microfacet_ggx_aniso_fresnel(Normal, T, alpha_x, alpha_y, (2.0 / (1.0 - sqrt(0.08 * Specular))) - 1.0, BaseColor, Cspec0); + } else { + BSDF = BSDF + specular_weight * microfacet_multi_ggx_aniso_fresnel(Normal, T, alpha_x, alpha_y, (2.0 / (1.0 - sqrt(0.08 * Specular))) - 1.0, BaseColor, Cspec0); + } + } + + if (final_transmission > 1e-5) { + color Cspec0 = BaseColor * SpecularTint + color(1.0, 1.0, 1.0) * (1.0 - SpecularTint); + float eta = backfacing() ? 1.0 / f : f; + + if (distribution == "GGX" || Roughness <= 5e-2) { + float cosNO = dot(Normal, I); + float Fr = fresnel_dielectric_cos(cosNO, eta); + + float refl_roughness = Roughness; + if (Roughness <= 1e-2) + refl_roughness = 0.0; + + float transmission_roughness = refl_roughness; + if (distribution == "GGX") + transmission_roughness = 1.0 - (1.0 - refl_roughness) * (1.0 - TransmissionRoughness); + + BSDF = BSDF + final_transmission * (Fr * microfacet_ggx_fresnel(Normal, refl_roughness * refl_roughness, eta, BaseColor, Cspec0) + + (1.0 - Fr) * BaseColor * microfacet_ggx_refraction(Normal, transmission_roughness * transmission_roughness, eta)); + } else { + BSDF = BSDF + final_transmission * microfacet_multi_ggx_glass_fresnel(Normal, Roughness * Roughness, eta, BaseColor, Cspec0); + } + } + + if (Clearcoat > 1e-5) { + BSDF = BSDF + principled_clearcoat(ClearcoatNormal, Clearcoat, ClearcoatRoughness * ClearcoatRoughness); + } +} + |