Better attenuation

Author: photonstorm

src/renderer/webgl/shaders/PointLight-frag.js

@@ -11,17 +11,16 @@ module.exports = [
     '',
     'void main()',
     '{',
-    '    vec2 center = vec2((lightPosition.x + 0.0) * uResolution.x, (lightPosition.y + 0.0) * uResolution.y);',
+    '    vec2 center = vec2((lightPosition.x + 1.0) * uResolution.x, (lightPosition.y + 1.0) * uResolution.y);',
     '',
     '    float distance = length(center - gl_FragCoord.xy);',
     '',
     '    // float attenuation = 1.0 / distance;',
-    '    float attenuation = 1.0 / (1.0 + 0.1 * distance + 0.01 * distance * distance);',
+    '    // float attenuation = 1.0 / (0.01 * distance + 0.01 * distance * distance);',
+    '    float attenuation = 1.0 / (0.01 * distance * distance);',
     '    float radius = 1.0 - min(distance, lightRadius) / lightRadius;',
     '    float intensity = smoothstep(0.0, 1.0, min(attenuation, radius));',
     '',
-    '    // vec4 color = vec4(intensity, intensity, intensity, 0.0) * vec4(lightColor.rgb, 1.0);',
-    '',
     '    vec4 color = vec4(intensity, intensity, intensity, 0.0) * lightColor;',
     '',
     '    gl_FragColor = vec4(color.rgb * lightColor.a, color.a);',

src/renderer/webgl/shaders/src/PointLight.frag

@@ -14,8 +14,7 @@ void main()
 
     float distance = length(center - gl_FragCoord.xy);
 
-    // float attenuation = 1.0 / distance;
-    float attenuation = 1.0 / (1.0 + 0.1 * distance + 0.01 * distance * distance);
+    float attenuation = 1.0 / (0.01 * distance * distance);
     float radius = 1.0 - min(distance, lightRadius) / lightRadius;
     float intensity = smoothstep(0.0, 1.0, min(attenuation, radius));