Remove no longer necessary light vector parameter.

libraries/model/src/model/Light.slh

@@ -98,10 +98,8 @@ float getLightShowContour(Light l) {
     return l._control.w;
 }
 
-// Light is the light source its self, d is the light's distance, and ulightvec is the unnormalized light vector.
-// Note that ulightvec should be calculated as light position - fragment position.
-// Additionally, length(light position) != dot(light position, light position).
-float evalLightAttenuation(Light l, float d, vec3 ulightvec) {
+// 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 = 1.0 / (denom * denom);

libraries/render-utils/src/point_light.slf

@@ -67,7 +67,7 @@ void main(void) {
     vec4 shading = evalFragShading(fragNormal, fragLightDir, fragEyeDir, frag.metallic, frag.specular, frag.roughness);
 
     // Eval attenuation  
-    float radialAttenuation = evalLightAttenuation(light, fragLightDistance, fragLightVec);
+    float radialAttenuation = evalLightAttenuation(light, fragLightDistance);
 
     // Final Lighting color
     vec3 fragColor = (shading.w * frag.diffuse + shading.xyz);

libraries/render-utils/src/spot_light.slf

@@ -74,7 +74,7 @@ void main(void) {
     vec4 shading = evalFragShading(fragNormal, fragLightDir, fragEyeDir, frag.metallic, frag.specular, frag.roughness);
  
     // Eval attenuation
-    float radialAttenuation = evalLightAttenuation(light, fragLightDistance, fragLightVec);
+    float radialAttenuation = evalLightAttenuation(light, fragLightDistance4);
     float angularAttenuation = evalLightSpotAttenuation(light, cosSpotAngle);
 
     // Final Lighting color