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Lib SSS - Shader API | Substance 3D Painter

Last updated on Jul 13, 2023

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Lib SSS - Shader API

lib-sss.glsl

Public Functions: getSSSCoefficients

Import from library

import lib-sampler.glsl

The scalar SSS coefficient texture

//: param auto channel_scattering 
uniform SamplerSparse sss_tex; 
 
//: param auto scene_original_radius 
uniform float sssSceneScale; 
 
//: param custom { 
//:   "label": "Enable", 
//:   "default": true, 
//:   "group": "Subsurface Scattering Parameters", 
//:   "description": "<html><head/><body><p>Enable the Subsurface Scattering. It needs to be activated in the Display Settings and a Scattering channel needs to be present for these parameters to have an effect.</p></body></html>" 
//: } 
uniform bool sssEnabled;

Select whether the light penetrates straight through the material (translucent) or is diffused before starting to scatter (skin).

//: param custom { 
//:   "default": 1, 
//:   "label": "Scattering Type", 
//:   "widget": "combobox", 
//:   "values": { 
//:     "Translucent": 0, 
//:     "Skin": 1 
//:   }, 
//:   "group": "Subsurface Scattering Parameters", 
//:   "description": "<html><head/><body><p>Skin or Translucent/Generic. It needs to be activated in the Display Settings and a Scattering channel needs to be present for these parameters to have an effect.</p></body></html>" 
//: } 
uniform int sssType;

Global scale to the subsurface scattering effect

//: param custom { 
//:   "default": 0.5, 
//:   "label": "Scale", 
//:   "min": 0.01, 
//:   "max": 1.0, 
//:   "group": "Subsurface Scattering Parameters", 
//:   "description": "<html><head/><body><p>Controls the radius/depth of the light absorption in the material. It needs to be activated in the Display Settings and a Scattering channel needs to be present for these parameters to have an effect.</p></body></html>" 
//: } 
uniform float sssScale;

Wavelength dependency of the SSS of the material

//: param custom { 
//:   "default": [0.701, 0.301, 0.305], 
//:   "label": "Color", 
//:   "widget": "color", 
//:   "group": "Subsurface Scattering Parameters", 
//:   "description": "<html><head/><body><p>The color of light when absorbed by the material. It needs to be activated in the Display Settings and a Scattering channel needs to be present for these parameters to have an effect.</p></body></html>" 
//: } 
uniform vec3 sssColor;

Return the material SSS coefficients

vec4 getSSSCoefficients(float scattering) { 
  if (sssEnabled) { 
    vec3 sss = sssScale / sssSceneScale * scattering * sssColor; 
    return vec4(sss, sss == vec3(0.0) ? 0.0 : 1.0); 
  } 
  return vec4(0.0); 
} 
vec4 getSSSCoefficients(SparseCoord coord) { 
  if (sssEnabled) { 
    return getSSSCoefficients(getScattering(sss_tex, coord)); 
  } 
  return vec4(0.0); 
}

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Lib SSS - Shader API | Substance 3D Painter

Lib SSS - Shader API

lib-sss.glsl

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