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SSGINode: Fix linear thickness computation. #31863

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Merged
merged 1 commit into from
Sep 9, 2025
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SSGINode: Fix linear thickness computation. #31863

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2 changes: 1 addition & 1 deletion examples/jsm/tsl/display/SSGINode.js
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Original file line number Diff line number Diff line change
Expand Up @@ -493,7 +493,7 @@ class SSGINode extends TempNode {

const sampleViewPosition = getViewPosition( sampleUV, sampleDepth( sampleUV ), this._cameraProjectionMatrixInverse ).toConst();
const pixelToSample = sampleViewPosition.sub( viewPosition ).normalize().toConst();
const linearThicknessMultiplier = this.useLinearThickness.equal( true ).select( sampleViewPosition.z.div( this._cameraFar ).clamp().mul( 100 ), float( 1 ) );
const linearThicknessMultiplier = this.useLinearThickness.equal( true ).select( sampleViewPosition.z.negate().div( this._cameraFar ).clamp().mul( 100 ), float( 1 ) );
const pixelToSampleBackface = normalize( sampleViewPosition.sub( linearThicknessMultiplier.mul( viewDir ).mul( THICKNESS ) ).sub( viewPosition ) );

let frontBackHorizon = vec2( dot( pixelToSample, viewDir ), dot( pixelToSampleBackface, viewDir ) );
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2 changes: 1 addition & 1 deletion examples/webgpu_postprocessing_ssgi.html
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Expand Up @@ -132,9 +132,9 @@
gui.add( giPass.backfaceLighting, 'value', 0, 1 ).name( 'backface lighting' );
gui.add( giPass.aoIntensity, 'value', 0, 4 ).name( 'AO intenstiy' );
gui.add( giPass.giIntensity, 'value', 0, 100 ).name( 'GI intenstiy' );
gui.add( giPass.useLinearThickness, 'value' ).name( 'use linear thickness' );
gui.add( giPass.useScreenSpaceSampling, 'value' ).name( 'screen-space sampling' );
gui.add( giPass, 'useTemporalFiltering' ).name( 'temporal filtering' );
//gui.add( giPass.useLinearThickness, 'value' ).name( 'use linear thickness' );

const params = {
output: 0
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