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import { Light } from './Light.js';
import { SpotLightShadow } from './SpotLightShadow.js';
import { Object3D } from '../core/Object3D.js';
/**
* @author alteredq / http://alteredqualia.com/
*/
function SpotLight( color, intensity, distance, angle, penumbra, decay ) {
Light.call( this, color, intensity );
this.type = 'SpotLight';
this.position.copy( Object3D.DefaultUp );
this.updateMatrix();
this.target = new Object3D();
Object.defineProperty( this, 'power', {
get: function () {
// 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: function ( 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;
}
} );
this.distance = ( distance !== undefined ) ? distance : 0;
this.angle = ( angle !== undefined ) ? angle : Math.PI / 3;
this.penumbra = ( penumbra !== undefined ) ? penumbra : 0;
this.decay = ( decay !== undefined ) ? decay : 1; // for physically correct lights, should be 2.
this.shadow = new SpotLightShadow();
}
SpotLight.prototype = Object.assign( Object.create( Light.prototype ), {
constructor: SpotLight,
isSpotLight: true,
copy: function ( source ) {
Light.prototype.copy.call( this, 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;
}
} );
export { SpotLight };
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