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WebGLRenderer: Use Vogel disk sampling for PCF shadows #32180

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WebGLRenderer: Use Vogel disk sampling for PCF shadows #32180

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a8431dc
WebGLRenderer: Use Vogel disk sampling for PCF shadows.
mrdoob Nov 4, 2025
fbacf2c
Updated interleavedGradientNoise implementation.
mrdoob Nov 4, 2025
7d80948
Clean up.
mrdoob Nov 4, 2025
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97 changes: 60 additions & 37 deletions src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,26 @@ export default /* glsl */`

#endif

float interleavedGradientNoise( vec2 position ) {

return fract( 52.9829189 * fract( dot( position, vec2( 0.06711056, 0.00583715 ) ) ) );

}

vec2 vogelDiskSample( int sampleIndex, int samplesCount, float phi ) {

const float goldenAngle = 2.399963229728653;

float r = sqrt( float( sampleIndex ) + 0.5 ) / sqrt( float( samplesCount ) );
float theta = float( sampleIndex ) * goldenAngle + phi;

float sine = sin( theta );
float cosine = cos( theta );

return vec2( cosine, sine ) * r;

}

float texture2DCompare( sampler2D depths, vec2 uv, float compare ) {

float depth = unpackRGBAToDepth( texture2D( depths, uv ) );
Expand Down Expand Up @@ -132,34 +152,26 @@ export default /* glsl */`

vec2 texelSize = vec2( 1.0 ) / shadowMapSize;

float dx0 = - texelSize.x * shadowRadius;
float dy0 = - texelSize.y * shadowRadius;
float dx1 = + texelSize.x * shadowRadius;
float dy1 = + texelSize.y * shadowRadius;
float dx2 = dx0 / 2.0;
float dy2 = dy0 / 2.0;
float dx3 = dx1 / 2.0;
float dy3 = dy1 / 2.0;
float phi = interleavedGradientNoise( gl_FragCoord.xy ) * PI2;

vec2 offset = texelSize * shadowRadius;
vec2 uv = shadowCoord.xy;
float compare = shadowCoord.z;

shadow = (
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy2 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy2 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy2 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, 0.0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, 0.0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx2, dy3 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy3 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx3, dy3 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +
texture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )
) * ( 1.0 / 17.0 );
texture2DCompare( shadowMap, uv + vogelDiskSample( 0, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 1, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 2, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 3, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 4, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 5, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 6, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 7, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 8, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 9, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 10, 12, phi ) * offset, compare ) +
texture2DCompare( shadowMap, uv + vogelDiskSample( 11, 12, phi ) * offset, compare )
) * ( 1.0 / 12.0 );

#elif defined( SHADOWMAP_TYPE_PCF_SOFT )

Expand Down Expand Up @@ -307,19 +319,30 @@ export default /* glsl */`

#if defined( SHADOWMAP_TYPE_PCF ) || defined( SHADOWMAP_TYPE_PCF_SOFT ) || defined( SHADOWMAP_TYPE_VSM )

vec2 offset = vec2( - 1, 1 ) * shadowRadius * texelSize.y;
float phi = interleavedGradientNoise( gl_FragCoord.xy ) * PI2;

float offset = shadowRadius * texelSize.y;
float texelSizeY = texelSize.y;

vec2 d0 = vogelDiskSample( 0, 8, phi ) * offset;
vec2 d1 = vogelDiskSample( 1, 8, phi ) * offset;
vec2 d2 = vogelDiskSample( 2, 8, phi ) * offset;
vec2 d3 = vogelDiskSample( 3, 8, phi ) * offset;
vec2 d4 = vogelDiskSample( 4, 8, phi ) * offset;
vec2 d5 = vogelDiskSample( 5, 8, phi ) * offset;
vec2 d6 = vogelDiskSample( 6, 8, phi ) * offset;
vec2 d7 = vogelDiskSample( 7, 8, phi ) * offset;

shadow = (
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyy, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyy, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyx, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyx, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxy, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxy, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxx, texelSize.y ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxx, texelSize.y ), dp )
) * ( 1.0 / 9.0 );
texture2DCompare( shadowMap, cubeToUV( bd3D + d0.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d1.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d2.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d3.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d4.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d5.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d6.xyx, texelSizeY ), dp ) +
texture2DCompare( shadowMap, cubeToUV( bd3D + d7.xyx, texelSizeY ), dp )
) * ( 1.0 / 8.0 );

#else // no percentage-closer filtering

Expand Down