63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
import { Light } from './Light.js';
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import { PerspectiveCamera } from '../cameras/PerspectiveCamera.js';
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import { LightShadow } from './LightShadow.js';
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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function PointLight( color, intensity, distance, decay ) {
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Light.call( this, color, intensity );
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this.type = 'PointLight';
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Object.defineProperty( this, 'power', {
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get: function () {
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// intensity = power per solid angle.
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// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
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return this.intensity * 4 * Math.PI;
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},
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set: function ( power ) {
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// intensity = power per solid angle.
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// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
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this.intensity = power / ( 4 * Math.PI );
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}
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} );
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this.distance = ( distance !== undefined ) ? distance : 0;
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this.decay = ( decay !== undefined ) ? decay : 1; // for physically correct lights, should be 2.
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this.shadow = new LightShadow( new PerspectiveCamera( 90, 1, 0.5, 500 ) );
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}
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PointLight.prototype = Object.assign( Object.create( Light.prototype ), {
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constructor: PointLight,
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isPointLight: true,
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copy: function ( source ) {
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Light.prototype.copy.call( this, source );
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this.distance = source.distance;
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this.decay = source.decay;
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this.shadow = source.shadow.clone();
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return this;
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}
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} );
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export { PointLight };
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