backend/libs/three/lights/RectAreaLight.js

import { Light } from './Light.js';

class RectAreaLight extends Light {
	constructor(color, intensity, width = 10, height = 10) {
		super(color, intensity);

		this.type = 'RectAreaLight';

		this.width = width;
		this.height = height;
	}

	get power() {
		// compute the light's luminous power (in lumens) from its intensity (in nits)
		return this.intensity * this.width * this.height * Math.PI;
	}

	set power(power) {
		// set the light's intensity (in nits) from the desired luminous power (in lumens)
		this.intensity = power / (this.width * this.height * Math.PI);
	}

	copy(source) {
		super.copy(source);

		this.width = source.width;
		this.height = source.height;

		return this;
	}

	toJSON(meta) {
		const data = super.toJSON(meta);

		data.object.width = this.width;
		data.object.height = this.height;

		return data;
	}
}

RectAreaLight.prototype.isRectAreaLight = true;

export { RectAreaLight };