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Merge pull request #7945 from Geenz/20901

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20901: Add Range Based Light Attenuation
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samcake 2016-05-25 16:39:01 -07:00
commit b76cda3c89
2 changed files with 10 additions and 2 deletions
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10
libraries/model/src/model/Light.slh
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@ -98,10 +98,18 @@ float getLightShowContour(Light l) {
return l._control.w;
}
// Light is the light source its self, d is the light's distance calculated as length(unnormalized light vector).
float evalLightAttenuation(Light l, float d) {
float radius = getLightRadius(l);
float denom = d / radius + 1.0;
float attenuation = min(1.0, 1.0 / (denom * denom));
float attenuation = 1.0 / (denom * denom);
float cutoff = getLightCutoffRadius(l);
// "Fade" the edges of light sources to make things look a bit more attractive.
// Note: this tends to look a bit odd at lower exponents.
attenuation *= min(1, max(0, -(d - cutoff)));
return attenuation;
}

2
libraries/render-utils/src/point_light.slf
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@ -66,7 +66,7 @@ void main(void) {
vec3 fragEyeDir = normalize(fragEyeVector.xyz);
vec4 shading = evalFragShading(fragNormal, fragLightDir, fragEyeDir, frag.metallic, frag.specular, frag.roughness);
// Eval attenuation
// Eval attenuation
float radialAttenuation = evalLightAttenuation(light, fragLightDistance);
// Final Lighting color