Substance 3D Painter Clay shader

Import from libraries.

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import lib-vectors.glsl
 
 
 //: param custom { "default": [0.3, 0.07, 0.05], "label": "Color", "widget": "color" }
 uniform vec3 clayColor;
 
 //: param custom { "default": 0.25, "label": "Glossiness", "min": 0.001, "max": 1.0 }
 uniform float clayGloss;
 
 //: param custom { "default": [0.3, 0.3, 0.3], "label": "Dirt Color", "widget": "color" }
 uniform vec3 dirtColor;
 
 //: param custom { "default": 0.25, "label": "Dirt Amount", "min": 0.0, "max": 1.0 }
 uniform float clayDirt;
 
 //: param custom { "default": 0.1, "label": "Ambient", "min": 0.0, "max": 1.0 }
 uniform float ambient;
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import lib-vectors.glsl
 
 
 //: param custom { "default": [0.3, 0.07, 0.05], "label": "Color", "widget": "color" }
 uniform vec3 clayColor;
 
 //: param custom { "default": 0.25, "label": "Glossiness", "min": 0.001, "max": 1.0 }
 uniform float clayGloss;
 
 //: param custom { "default": [0.3, 0.3, 0.3], "label": "Dirt Color", "widget": "color" }
 uniform vec3 dirtColor;
 
 //: param custom { "default": 0.25, "label": "Dirt Amount", "min": 0.0, "max": 1.0 }
 uniform float clayDirt;
 
 //: param custom { "default": 0.1, "label": "Ambient", "min": 0.0, "max": 1.0 }
 uniform float ambient;

Entry point of the shader.

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void shade(V2F inputs)
 {
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void shade(V2F inputs)
 {

We generate local world space vectors

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  LocalVectors vectors = computeLocalFrame(inputs);
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  LocalVectors vectors = computeLocalFrame(inputs);

Simulate camera aligned lighting

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  float NdV = max(0.0, dot(vectors.normal, vectors.eye));
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  float NdV = max(0.0, dot(vectors.normal, vectors.eye));

We generate main color from screen-space curvature

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  vec3 dNdx = dFdx(vectors.normal);
   vec3 dNdy = dFdy(vectors.normal);
   vec3 xneg = vectors.normal - dNdx;
   vec3 xpos = vectors.normal + dNdx;
   vec3 yneg = vectors.normal - dNdy;
   vec3 ypos = vectors.normal + dNdy;
   float depth = length(inputs.position);
   float curvature = 2.0 * (cross(xneg, xpos).y - cross(yneg, ypos).x) / depth;
 
   float dirt = clamp(-4.0 * curvature, 0.0, 1.0) * clayDirt;
   vec3 diffuse = mix(clayColor, dirtColor, dirt);
   float specular = clayGloss * (1.0 - dirt) * (0.5 * curvature + 0.5);
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  vec3 dNdx = dFdx(vectors.normal);
   vec3 dNdy = dFdy(vectors.normal);
   vec3 xneg = vectors.normal - dNdx;
   vec3 xpos = vectors.normal + dNdx;
   vec3 yneg = vectors.normal - dNdy;
   vec3 ypos = vectors.normal + dNdy;
   float depth = length(inputs.position);
   float curvature = 2.0 * (cross(xneg, xpos).y - cross(yneg, ypos).x) / depth;
 
   float dirt = clamp(-4.0 * curvature, 0.0, 1.0) * clayDirt;
   vec3 diffuse = mix(clayColor, dirtColor, dirt);
   float specular = clayGloss * (1.0 - dirt) * (0.5 * curvature + 0.5);

Ambient and diffuse contribution

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  diffuseShadingOutput((ambient + NdV) * diffuse);
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  diffuseShadingOutput((ambient + NdV) * diffuse);

Specular contribution

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  specularShadingOutput(vec3(specular * pow(NdV, 64.0 * clayGloss)));
 }
 
 
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  specularShadingOutput(vec3(specular * pow(NdV, 64.0 * clayGloss)));
 }
 
 

Last updated 10/3/2024

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