48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#include "node_fresnel.h"
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#include "stdcycles.h"
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shader node_glossy_bsdf(color Color = 0.8,
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string distribution = "ggx",
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float Roughness = 0.2,
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float Anisotropy = 0.0,
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float Rotation = 0.0,
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normal Normal = N,
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normal Tangent = 0.0,
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output closure color BSDF = 0)
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{
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/* compute roughness */
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float roughness = Roughness * Roughness;
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float roughness_u, roughness_v;
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float aniso = clamp(Anisotropy, -0.99, 0.99);
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/* rotate tangent around normal */
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vector T = Tangent;
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if (abs(aniso) <= 1e-4) {
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roughness_u = roughness;
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roughness_v = roughness;
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}
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else {
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if (Rotation != 0.0)
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T = rotate(T, Rotation * M_2PI, point(0.0, 0.0, 0.0), Normal);
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if (aniso < 0.0) {
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roughness_u = roughness / (1.0 + aniso);
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roughness_v = roughness * (1.0 + aniso);
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}
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else {
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roughness_u = roughness * (1.0 - aniso);
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roughness_v = roughness / (1.0 - aniso);
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}
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}
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if (distribution == "Multiscatter GGX")
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BSDF = Color * microfacet_multi_ggx_aniso(Normal, T, roughness_u, roughness_v, Color);
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else
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BSDF = Color * microfacet(distribution, Normal, T, roughness_u, roughness_v, 0.0, 0);
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}
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