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Optimize Vogel disk sampling sqrt. #32407

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Merged
merged 1 commit into from
Nov 28, 2025
Merged

Optimize Vogel disk sampling sqrt. #32407

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2 changes: 1 addition & 1 deletion src/nodes/utils/PostProcessingUtils.js
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Expand Up @@ -139,7 +139,7 @@ export const interleavedGradientNoise = Fn( ( [ position ] ) => {
export const vogelDiskSample = Fn( ( [ sampleIndex, samplesCount, phi ] ) => {

const goldenAngle = float( 2.399963229728653 ); // 2π * (2 - φ) where φ is golden ratio
const r = sqrt( float( sampleIndex ).add( 0.5 ) ).div( sqrt( float( samplesCount ) ) );
const r = sqrt( float( sampleIndex ).add( 0.5 ).div( float( samplesCount ) ) );
const theta = float( sampleIndex ).mul( goldenAngle ).add( phi );
return vec2( cos( theta ), sin( theta ) ).mul( r );

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2 changes: 1 addition & 1 deletion src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl.js
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Expand Up @@ -104,7 +104,7 @@ export default /* glsl */`
vec2 vogelDiskSample( int sampleIndex, int samplesCount, float phi ) {

const float goldenAngle = 2.399963229728653;
float r = sqrt( float( sampleIndex ) + 0.5 ) / sqrt( float( samplesCount ) );
float r = sqrt( ( float( sampleIndex ) + 0.5 ) / float( samplesCount ) );
float theta = float( sampleIndex ) * goldenAngle + phi;
return vec2( cos( theta ), sin( theta ) ) * r;

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