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Examples: GTAOPass - distance dependent horizon search #27370

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Dec 13, 2023
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Examples: GTAOPass - distance dependent horizon search #27370

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7 changes: 7 additions & 0 deletions examples/jsm/postprocessing/GTAOPass.js
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Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,13 @@ class GTAOPass extends Pass {

}

if ( parameters.distanceFallOff !== undefined ) {

this.gtaoMaterial.uniforms.distanceFallOff.value = parameters.distanceFallOff;
this.gtaoMaterial.needsUpdate = true;

}

if ( parameters.scale !== undefined ) {

this.gtaoMaterial.uniforms.scale.value = parameters.scale;
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8 changes: 5 additions & 3 deletions examples/jsm/shaders/GTAOShader.js
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Expand Up @@ -63,6 +63,7 @@ const GTAOShader = {
radius: { value: 0.25 },
distanceExponent: { value: 1. },
thickness: { value: 1. },
distanceFallOff: { value: 1. },
scale: { value: 1. },
sceneBoxMin: { value: new Vector3( - 1, - 1, - 1 ) },
sceneBoxMax: { value: new Vector3( 1, 1, 1 ) },
Expand Down Expand Up @@ -91,6 +92,7 @@ const GTAOShader = {
uniform float radius;
uniform float distanceExponent;
uniform float thickness;
uniform float distanceFallOff;
uniform float scale;
#if SCENE_CLIP_BOX == 1
uniform vec3 sceneBoxMin;
Expand Down Expand Up @@ -224,15 +226,15 @@ const GTAOShader = {
vec3 viewDelta = sampleSceneViewPos - viewPos;
if (abs(viewDelta.z) < thickness) {
float sampleCosHorizon = dot(viewDir, normalize(viewDelta));
cosHorizons.x = max(cosHorizons.x, sampleCosHorizon);
cosHorizons.x += max(0., (sampleCosHorizon - cosHorizons.x) * mix(1., 2. / float(j + 2), distanceFallOff));
}

sampleSceneUvDepth = getSceneUvAndDepth(viewPos - sampleViewOffset);
sampleSceneViewPos = getViewPosition(sampleSceneUvDepth.xy, sampleSceneUvDepth.z);
viewDelta = sampleSceneViewPos - viewPos;
if (abs(viewDelta.z) < thickness) {
float sampleCosHorizon = dot(viewDir, normalize(viewDelta));
cosHorizons.y = max(cosHorizons.y, sampleCosHorizon);
cosHorizons.y += max(0., (sampleCosHorizon - cosHorizons.y) * mix(1., 2. / float(j + 2), distanceFallOff));
}
}

Expand Down Expand Up @@ -353,7 +355,7 @@ function generateMagicSquareNoise( size = 5 ) {
data[ inx * 4 ] = ( randomVec.x * 0.5 + 0.5 ) * 255;
data[ inx * 4 + 1 ] = ( randomVec.y * 0.5 + 0.5 ) * 255;
data[ inx * 4 + 2 ] = 127;
data[ inx * 4 + 3 ] = 0;
data[ inx * 4 + 3 ] = 255;

}

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6 changes: 2 additions & 4 deletions examples/webgl_postprocessing_gtao.html
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Expand Up @@ -137,10 +137,7 @@
thickness: 1.,
scale: 1.,
samples: 16,
distanceFallOff: true,
clipRangeCheck: true,
depthRelativeBias: false,
nvAlignedSamples: false,
distanceFallOff: 1.,
screenSpaceRadius: false,
};
const pdParameters = {
Expand All @@ -158,6 +155,7 @@
gui.add( aoParameters, 'radius' ).min( 0.01 ).max( 1 ).step( 0.01 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'distanceExponent' ).min( 1 ).max( 4 ).step( 0.01 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'thickness' ).min( 0.01 ).max( 10 ).step( 0.01 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'distanceFallOff' ).min( 0 ).max( 1 ).step( 0.01 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'scale' ).min( 0.01 ).max( 2.0 ).step( 0.01 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'samples' ).min( 2 ).max( 32 ).step( 1 ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
gui.add( aoParameters, 'screenSpaceRadius' ).onChange( () => gtaoPass.updateGtaoMaterial( aoParameters ) );
Expand Down