Substance 3D Painter PBR Velvet shader

Import from libraries.

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import lib-sampler.glsl
 import lib-pbr.glsl
 import lib-normal.glsl
 import lib-utils.glsl
 
 //: param auto channel_basecolor
 uniform SamplerSparse basecolor_tex;
 //: param auto channel_roughness
 uniform SamplerSparse roughness_tex;
 //: param auto channel_metallic
 uniform SamplerSparse metallic_tex;
 //: param auto channel_specularlevel
 uniform SamplerSparse specularlevel_tex;
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import lib-sampler.glsl
 import lib-pbr.glsl
 import lib-normal.glsl
 import lib-utils.glsl
 
 //: param auto channel_basecolor
 uniform SamplerSparse basecolor_tex;
 //: param auto channel_roughness
 uniform SamplerSparse roughness_tex;
 //: param auto channel_metallic
 uniform SamplerSparse metallic_tex;
 //: param auto channel_specularlevel
 uniform SamplerSparse specularlevel_tex;

-------EXTERNAL ---------------------------------------------------//

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//: param custom { "default": "fibers", "label": "Fibers Texture", "usage": "texture" }
 uniform sampler2D fiber_tex;
 //: param custom { "default": 50.0, "label": "Fiber Scale", "min": 1.0, "max": 100.0 }
 uniform float fiber_scale;
 //: param custom { "default": 0.5, "label": "Sheen", "min": 0.0, "max": 2.0 }
 uniform float sheen;
 //: param custom { "default": "sheen_noise", "label": "Sheen Variation", "usage": "texture" }
 uniform sampler2D sheen_noise;
 //: param custom { "default": 3.0, "label": "Variation Scale", "min": 1.0, "max": 10.0 }
 uniform float sheen_noise_scale;
 //: param custom { "default": 8.0, "label": "Edginess", "min": 1.0, "max": 16.0 }
 uniform float edginess;
 //: param custom { "default": 0.75, "label": "Fabric Tint", "min": 0.0, "max": 1.0 }
 uniform float tint_amount;
 
 
 // SHADER
 void shade(V2F inputs)
 {
   float roughness = getRoughness(roughness_tex, inputs.sparse_coord);
   vec3 baseColor = getBaseColor(basecolor_tex, inputs.sparse_coord);
   float metallic = getMetallic(metallic_tex, inputs.sparse_coord);
   float specularLevel = getSpecularLevel(specularlevel_tex, inputs.sparse_coord);
   vec3 diffColor = generateDiffuseColor(baseColor, metallic);
   vec3 specColor = generateSpecularColor(specularLevel, baseColor, metallic);
   // Get detail (ambient occlusion) and global (shadow) occlusion factors
   float occlusion = getAO(inputs.sparse_coord) * getShadowFactor();
   float specOcclusion = specularOcclusionCorrection(occlusion, metallic, roughness);
 
   LocalVectors vectors = computeLocalFrame(inputs);
 
   // Material
   vec3 diffuse = occlusion * pbrComputeDiffuse(vectors.normal, diffColor);
   vec3 specular = specOcclusion * pbrComputeSpecular(vectors, specColor, roughness);
 
   // Velvet reflection, simply summed over previous computation
   float cosine = clamp(dot(normalize(vectors.normal), normalize(vectors.eye)), 0.0, 1.0);
   float sine = sqrt(1.0 - cosine * cosine);
   float rand = texture(fiber_tex, inputs.tex_coord * fiber_scale).r;
   float noise = texture(sheen_noise, inputs.tex_coord * sheen_noise_scale).r;
   float intensity = rand * (sheen * noise + 0.002) * pow(sine, edginess);
   vec3 tint = mix(vec3(1.0), diffColor, tint_amount);
   diffuse += intensity * mix(occlusion, 1.0, 1.0 / edginess) * envIrradiance(vectors.normal) * tint;
 
   diffuseShadingOutput(diffuse);
   specularShadingOutput(specular);
 }
 
 
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//: param custom { "default": "fibers", "label": "Fibers Texture", "usage": "texture" }
 uniform sampler2D fiber_tex;
 //: param custom { "default": 50.0, "label": "Fiber Scale", "min": 1.0, "max": 100.0 }
 uniform float fiber_scale;
 //: param custom { "default": 0.5, "label": "Sheen", "min": 0.0, "max": 2.0 }
 uniform float sheen;
 //: param custom { "default": "sheen_noise", "label": "Sheen Variation", "usage": "texture" }
 uniform sampler2D sheen_noise;
 //: param custom { "default": 3.0, "label": "Variation Scale", "min": 1.0, "max": 10.0 }
 uniform float sheen_noise_scale;
 //: param custom { "default": 8.0, "label": "Edginess", "min": 1.0, "max": 16.0 }
 uniform float edginess;
 //: param custom { "default": 0.75, "label": "Fabric Tint", "min": 0.0, "max": 1.0 }
 uniform float tint_amount;
 
 
 // SHADER
 void shade(V2F inputs)
 {
   float roughness = getRoughness(roughness_tex, inputs.sparse_coord);
   vec3 baseColor = getBaseColor(basecolor_tex, inputs.sparse_coord);
   float metallic = getMetallic(metallic_tex, inputs.sparse_coord);
   float specularLevel = getSpecularLevel(specularlevel_tex, inputs.sparse_coord);
   vec3 diffColor = generateDiffuseColor(baseColor, metallic);
   vec3 specColor = generateSpecularColor(specularLevel, baseColor, metallic);
   // Get detail (ambient occlusion) and global (shadow) occlusion factors
   float occlusion = getAO(inputs.sparse_coord) * getShadowFactor();
   float specOcclusion = specularOcclusionCorrection(occlusion, metallic, roughness);
 
   LocalVectors vectors = computeLocalFrame(inputs);
 
   // Material
   vec3 diffuse = occlusion * pbrComputeDiffuse(vectors.normal, diffColor);
   vec3 specular = specOcclusion * pbrComputeSpecular(vectors, specColor, roughness);
 
   // Velvet reflection, simply summed over previous computation
   float cosine = clamp(dot(normalize(vectors.normal), normalize(vectors.eye)), 0.0, 1.0);
   float sine = sqrt(1.0 - cosine * cosine);
   float rand = texture(fiber_tex, inputs.tex_coord * fiber_scale).r;
   float noise = texture(sheen_noise, inputs.tex_coord * sheen_noise_scale).r;
   float intensity = rand * (sheen * noise + 0.002) * pow(sine, edginess);
   vec3 tint = mix(vec3(1.0), diffColor, tint_amount);
   diffuse += intensity * mix(occlusion, 1.0, 1.0 / edginess) * envIrradiance(vectors.normal) * tint;
 
   diffuseShadingOutput(diffuse);
   specularShadingOutput(specular);
 }
 
 

Last updated 10/3/2024

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