58 lines
1.0 KiB
JavaScript
58 lines
1.0 KiB
JavaScript
import { Light } from './Light.js';
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import { PointLightShadow } from './PointLightShadow.js';
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class PointLight extends Light {
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constructor( color, intensity, distance = 0, decay = 2 ) {
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super( color, intensity );
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this.isPointLight = true;
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this.type = 'PointLight';
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this.distance = distance;
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this.decay = decay;
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this.shadow = new PointLightShadow();
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}
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get power() {
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// compute the light's luminous power (in lumens) from its intensity (in candela)
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// for an isotropic light source, luminous power (lm) = 4 π luminous intensity (cd)
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return this.intensity * 4 * Math.PI;
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}
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set power( power ) {
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// set the light's intensity (in candela) from the desired luminous power (in lumens)
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this.intensity = power / ( 4 * Math.PI );
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}
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dispose() {
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this.shadow.dispose();
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}
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copy( source, recursive ) {
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super.copy( source, recursive );
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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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