three
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JavaScript 3D library
71 lines (42 loc) • 1.45 kB
JavaScript
import { Light } from './Light.js';
import { SpotLightShadow } from './SpotLightShadow.js';
import { Object3D } from '../core/Object3D.js';
class SpotLight extends Light {
constructor( color, intensity, distance = 0, angle = Math.PI / 3, penumbra = 0, decay = 1 ) {
super( color, intensity );
this.type = 'SpotLight';
this.position.copy( Object3D.DefaultUp );
this.updateMatrix();
this.target = new Object3D();
this.distance = distance;
this.angle = angle;
this.penumbra = penumbra;
this.decay = decay; // for physically correct lights, should be 2.
this.shadow = new SpotLightShadow();
}
get power() {
// intensity = power per solid angle.
// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
return this.intensity * Math.PI;
}
set power( power ) {
// intensity = power per solid angle.
// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
this.intensity = power / Math.PI;
}
dispose() {
this.shadow.dispose();
}
copy( source ) {
super.copy( source );
this.distance = source.distance;
this.angle = source.angle;
this.penumbra = source.penumbra;
this.decay = source.decay;
this.target = source.target.clone();
this.shadow = source.shadow.clone();
return this;
}
}
SpotLight.prototype.isSpotLight = true;
export { SpotLight };