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import { LightShadow } from './LightShadow.js';
import { PerspectiveCamera } from '../cameras/PerspectiveCamera.js';
import { Matrix4 } from '../math/Matrix4.js';
import { Vector2 } from '../math/Vector2.js';
import { Vector3 } from '../math/Vector3.js';
import { Vector4 } from '../math/Vector4.js';

const _projScreenMatrix = /*@__PURE__*/ new Matrix4();
const _lightPositionWorld = /*@__PURE__*/ new Vector3();
const _lookTarget = /*@__PURE__*/ new Vector3();

/**
 * Represents the shadow configuration of point lights.
 *
 * @augments LightShadow
 */
class PointLightShadow extends LightShadow {

/**
	 * Constructs a new point light shadow.
	 */
	constructor() {

super( new PerspectiveCamera( 90, 1, 0.5, 500 ) );

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

this._frameExtents = new Vector2( 4, 2 );

this._viewportCount = 6;

this._viewports = [
			// These viewports map a cube-map onto a 2D texture with the
			// following orientation:
			//
			//  xzXZ
			//   y Y
			//
			// X - Positive x direction
			// x - Negative x direction
			// Y - Positive y direction
			// y - Negative y direction
			// Z - Positive z direction
			// z - Negative z direction

// positive X
			new Vector4( 2, 1, 1, 1 ),
			// negative X
			new Vector4( 0, 1, 1, 1 ),
			// positive Z
			new Vector4( 3, 1, 1, 1 ),
			// negative Z
			new Vector4( 1, 1, 1, 1 ),
			// positive Y
			new Vector4( 3, 0, 1, 1 ),
			// negative Y
			new Vector4( 1, 0, 1, 1 )
		];

this._cubeDirections = [
			new Vector3( 1, 0, 0 ), new Vector3( - 1, 0, 0 ), new Vector3( 0, 0, 1 ),
			new Vector3( 0, 0, - 1 ), new Vector3( 0, 1, 0 ), new Vector3( 0, - 1, 0 )
		];

this._cubeUps = [
			new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ), new Vector3( 0, 1, 0 ),
			new Vector3( 0, 1, 0 ), new Vector3( 0, 0, 1 ),	new Vector3( 0, 0, - 1 )
		];

}

/**
	 * Update the matrices for the camera and shadow, used internally by the renderer.
	 *
	 * @param {Light} light - The light for which the shadow is being rendered.
	 * @param {number} [viewportIndex=0] - The viewport index.
	 */
	updateMatrices( light, viewportIndex = 0 ) {

const camera = this.camera;
		const shadowMatrix = this.matrix;

const far = light.distance || camera.far;

if ( far !== camera.far ) {

camera.far = far;
			camera.updateProjectionMatrix();

}

_lightPositionWorld.setFromMatrixPosition( light.matrixWorld );
		camera.position.copy( _lightPositionWorld );

_lookTarget.copy( camera.position );
		_lookTarget.add( this._cubeDirections[ viewportIndex ] );
		camera.up.copy( this._cubeUps[ viewportIndex ] );
		camera.lookAt( _lookTarget );
		camera.updateMatrixWorld();

shadowMatrix.makeTranslation( - _lightPositionWorld.x, - _lightPositionWorld.y, - _lightPositionWorld.z );

_projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
		this._frustum.setFromProjectionMatrix( _projScreenMatrix );

}

export { PointLightShadow };

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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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