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

/**
 * A light that gets emitted from a single point in all directions. A common
 * use case for this is to replicate the light emitted from a bare
 * lightbulb.
 *
 * This light can cast shadows - see the {@link PointLightShadow} for details.
 *
 * ```js
 * const light = new THREE.PointLight( 0xff0000, 1, 100 );
 * light.position.set( 50, 50, 50 );
 * scene.add( light );
 * ```
 *
 * @augments Light
 */
class PointLight extends Light {

/**
	 * Constructs a new point light.
	 *
	 * @param {(number|Color|string)} [color=0xffffff] - The light's color.
	 * @param {number} [intensity=1] - The light's strength/intensity measured in candela (cd).
	 * @param {number} [distance=0] - Maximum range of the light. `0` means no limit.
	 * @param {number} [decay=2] - The amount the light dims along the distance of the light.
	 */
	constructor( color, intensity, distance = 0, decay = 2 ) {

super( color, intensity );

/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isPointLight = true;

this.type = 'PointLight';

/**
		 * When distance is zero, light will attenuate according to inverse-square
		 * law to infinite distance. When distance is non-zero, light will attenuate
		 * according to inverse-square law until near the distance cutoff, where it
		 * will then attenuate quickly and smoothly to 0. Inherently, cutoffs are not
		 * physically correct.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.distance = distance;

/**
		 * The amount the light dims along the distance of the light. In context of
		 * physically-correct rendering the default value should not be changed.
		 *
		 * @type {number}
		 * @default 2
		 */
		this.decay = decay;

/**
		 * This property holds the light's shadow configuration.
		 *
		 * @type {PointLightShadow}
		 */
		this.shadow = new PointLightShadow();

}

/**
	 * The light's power. Power is the luminous power of the light measured in lumens (lm).
	 * Changing the power will also change the light's intensity.
	 *
	 * @type {number}
	 */
	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 };

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Name	Size	Perms	Modified	Actions
webgpu DIR	-	drwxr-xr-x	2025-03-28 11:04:38	Edit Download recursive recursive
AmbientLight.js	828 B	lrw-r--r--	2025-03-28 11:04:37	Edit Download recursive recursive
DirectionalLight.js	2.59 KB	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
DirectionalLightShadow.js	609 B	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
HemisphereLight.js	1.35 KB	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
Light.js	1.94 KB	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
LightProbe.js	2.24 KB	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
LightShadow.js	7.23 KB	lrw-r--r--	2025-03-28 11:04:38	Edit Download recursive recursive
PointLight.js	2.76 KB	lrw-r--r--	2025-03-28 11:04:39	Edit Download recursive recursive
PointLightShadow.js	2.99 KB	lrw-r--r--	2025-03-28 11:04:39	Edit Download recursive recursive
RectAreaLight.js	2.55 KB	lrw-r--r--	2025-03-28 11:04:39	Edit Download recursive recursive
SpotLight.js	4.46 KB	lrw-r--r--	2025-03-28 11:04:39	Edit Download recursive recursive
SpotLightShadow.js	1.34 KB	lrw-r--r--	2025-03-28 11:04:39	Edit Download recursive recursive

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