Lib SSS - Shader API

Last update: Thu Feb 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

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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