LYGIA Shader Library

falloff (lygia/v1.1.6/lighting/light/falloff)

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#ifndef FNC_LIGHT_FALLOFF
#define FNC_LIGHT_FALLOFF
float falloff(const in float _dist, const in float _lightRadius) {
    float att = clamp(1.0 - _dist * _dist / (_lightRadius * _lightRadius), 0.0, 1.0);
    att *= att;
    return att;
}
#endif

Check it on Github

#ifndef FNC_LIGHT_FALLOFF
#define FNC_LIGHT_FALLOFF
float falloff(float _dist, float _lightRadius) {
    float att = saturate(1.0 - _dist * _dist / (_lightRadius * _lightRadius));
    att *= att;
    return att;
}
#endif

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