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LightProbe: set from hemisphere light #16271

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Apr 18, 2019
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LightProbe: set from hemisphere light #16271

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39 changes: 39 additions & 0 deletions src/lights/LightProbe.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,45 @@ LightProbe.prototype = Object.assign( Object.create( Light.prototype ), {

isLightProbe: true,

setAmbientProbe: function ( color, intensity ) {

this.color.set( color );

this.intensity = intensity !== undefined ? intensity : 1;

this.sh.zero();

// without extra factor of PI in the shader, would be 2 / Math.sqrt( Math.PI );
this.sh.coefficients[ 0 ].set( 1, 1, 1 ).multiplyScalar( 2 * Math.sqrt( Math.PI ) );

},

setHemisphereProbe: function ( skyColor, groundColor, intensity ) {

// up-direction hardwired

this.color.setHex( 0xffffff );

this.intensity = intensity !== undefined ? intensity : 1;

var sky = new Color( skyColor );
var ground = new Color( groundColor );

/* cough */
sky = new Vector3( sky.r, sky.g, sky.b );
ground = new Vector3( ground.r, ground.g, ground.b );

// without extra factor of PI in the shader, should = 1 / Math.sqrt( Math.PI );
var c0 = Math.sqrt( Math.PI );
var c1 = c0 * Math.sqrt( 0.75 );

this.sh.zero();

this.sh.coefficients[ 0 ].copy( sky ).add( ground ).multiplyScalar( c0 );
this.sh.coefficients[ 1 ].copy( sky ).sub( ground ).multiplyScalar( c1 );

},

// https://www.ppsloan.org/publications/StupidSH36.pdf
setFromCubeTexture: function ( cubeTexture ) {

Expand Down