PointLight.js•1.03 kB
import { Light } from './Light.js';
import { PointLightShadow } from './PointLightShadow.js';
class PointLight extends Light {
constructor( color, intensity, distance = 0, decay = 2 ) {
super( color, intensity );
this.isPointLight = true;
this.type = 'PointLight';
this.distance = distance;
this.decay = decay;
this.shadow = new PointLightShadow();
}
get power() {
// compute the light's luminous power (in lumens) from its intensity (in candela)
// for an isotropic light source, luminous power (lm) = 4 π luminous intensity (cd)
return this.intensity * 4 * Math.PI;
}
set power( power ) {
// set the light's intensity (in candela) from the desired luminous power (in lumens)
this.intensity = power / ( 4 * Math.PI );
}
dispose() {
this.shadow.dispose();
}
copy( source, recursive ) {
super.copy( source, recursive );
this.distance = source.distance;
this.decay = source.decay;
this.shadow = source.shadow.clone();
return this;
}
}
export { PointLight };