@babylonjs/core/Shaders/ShadersInclude/pbrDirectLightingFalloffFunctions.js

Getting started? Play directly with the Babylon.js API using our [playground](https://playground.babylonjs.com/). It also contains a lot of samples to learn how to use it.

// Do not edit.
import { ShaderStore } from "../../Engines/shaderStore.js";
const name = "pbrDirectLightingFalloffFunctions";
const shader = `float computeDistanceLightFalloff_Standard(vec3 lightOffset,float range)
{return max(0.,1.0-length(lightOffset)/range);}
float computeDistanceLightFalloff_Physical(float lightDistanceSquared)
{return 1.0/maxEps(lightDistanceSquared);}
float computeDistanceLightFalloff_GLTF(float lightDistanceSquared,float inverseSquaredRange)
{float lightDistanceFalloff=1.0/maxEps(lightDistanceSquared);float factor=lightDistanceSquared*inverseSquaredRange;float attenuation=saturate(1.0-factor*factor);attenuation*=attenuation;lightDistanceFalloff*=attenuation;return lightDistanceFalloff;}
float computeDistanceLightFalloff(vec3 lightOffset,float lightDistanceSquared,float range,float inverseSquaredRange)
{
#ifdef USEPHYSICALLIGHTFALLOFF
return computeDistanceLightFalloff_Physical(lightDistanceSquared);
#elif defined(USEGLTFLIGHTFALLOFF)
return computeDistanceLightFalloff_GLTF(lightDistanceSquared,inverseSquaredRange);
#else
return computeDistanceLightFalloff_Standard(lightOffset,range);
#endif
}
float computeDirectionalLightFalloff_Standard(vec3 lightDirection,vec3 directionToLightCenterW,float cosHalfAngle,float exponent)
{float falloff=0.0;float cosAngle=maxEps(dot(-lightDirection,directionToLightCenterW));if (cosAngle>=cosHalfAngle)
{falloff=max(0.,pow(cosAngle,exponent));}
return falloff;}
float computeDirectionalLightFalloff_IES(vec3 lightDirection,vec3 directionToLightCenterW,sampler2D iesLightSampler)
{float cosAngle=dot(-lightDirection,directionToLightCenterW);float angle=acos(cosAngle)/PI;return texture2D(iesLightSampler,vec2(angle,0.)).r;}
float computeDirectionalLightFalloff_Physical(vec3 lightDirection,vec3 directionToLightCenterW,float cosHalfAngle)
{const float kMinusLog2ConeAngleIntensityRatio=6.64385618977; 
float concentrationKappa=kMinusLog2ConeAngleIntensityRatio/(1.0-cosHalfAngle);vec4 lightDirectionSpreadSG=vec4(-lightDirection*concentrationKappa,-concentrationKappa);float falloff=exp2(dot(vec4(directionToLightCenterW,1.0),lightDirectionSpreadSG));return falloff;}
float computeDirectionalLightFalloff_GLTF(vec3 lightDirection,vec3 directionToLightCenterW,float lightAngleScale,float lightAngleOffset)
{float cd=dot(-lightDirection,directionToLightCenterW);float falloff=saturate(cd*lightAngleScale+lightAngleOffset);falloff*=falloff;return falloff;}
float computeDirectionalLightFalloff(vec3 lightDirection,vec3 directionToLightCenterW,float cosHalfAngle,float exponent,float lightAngleScale,float lightAngleOffset)
{
#ifdef USEPHYSICALLIGHTFALLOFF
return computeDirectionalLightFalloff_Physical(lightDirection,directionToLightCenterW,cosHalfAngle);
#elif defined(USEGLTFLIGHTFALLOFF)
return computeDirectionalLightFalloff_GLTF(lightDirection,directionToLightCenterW,lightAngleScale,lightAngleOffset);
#else
return computeDirectionalLightFalloff_Standard(lightDirection,directionToLightCenterW,cosHalfAngle,exponent);
#endif
}`;
// Sideeffect
if (!ShaderStore.IncludesShadersStore[name]) {
    ShaderStore.IncludesShadersStore[name] = shader;
}
/** @internal */
export const pbrDirectLightingFalloffFunctions = { name, shader };
//# sourceMappingURL=pbrDirectLightingFalloffFunctions.js.map