/**
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* Compute parameters for physically based rendering using the
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* specular/glossy workflow. All inputs are linear; sRGB texture values must
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* be decoded beforehand
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*
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* @name czm_pbrSpecularGlossinessMaterial
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* @glslFunction
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*
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* @param {vec3} diffuse The diffuse color for dielectrics (non-metals)
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* @param {vec3} specular The reflectance at normal incidence (f0)
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* @param {float} glossiness A number from 0.0 to 1.0 indicating how smooth the surface is.
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* @return {czm_pbrParameters} parameters to pass into {@link czm_pbrLighting}
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*/
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czm_pbrParameters czm_pbrSpecularGlossinessMaterial(
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vec3 diffuse,
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vec3 specular,
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float glossiness
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)
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{
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czm_pbrParameters results;
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// glossiness is the opposite of roughness, but easier for artists to use.
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float roughness = 1.0 - glossiness;
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results.roughness = roughness * roughness;
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results.diffuseColor = diffuse * (1.0 - max(max(specular.r, specular.g), specular.b));
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results.f0 = specular;
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return results;
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}
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