@openhps/core/dist/esm/three/nodes/lighting/RectAreaLightNode.js

Open Hybrid Positioning System - Core component

import AnalyticLightNode from './AnalyticLightNode.js';
import { texture } from '../accessors/TextureNode.js';
import { uniform } from '../core/UniformNode.js';
import { lightViewPosition } from '../accessors/Lights.js';
import { renderGroup } from '../core/UniformGroupNode.js';
import { Matrix4 } from '../../math/Matrix4.js';
import { Vector3 } from '../../math/Vector3.js';
import { NodeUpdateType } from '../core/constants.js';
const _matrix41 = /*@__PURE__*/new Matrix4();
const _matrix42 = /*@__PURE__*/new Matrix4();
let _ltcLib = null;

/**
 * Module for representing rect area lights as nodes.
 *
 * @augments AnalyticLightNode
 */
class RectAreaLightNode extends AnalyticLightNode {
  static get type() {
    return 'RectAreaLightNode';
  }

  /**
   * Constructs a new rect area light node.
   *
   * @param {?RectAreaLight} [light=null] - The rect area light source.
   */
  constructor(light = null) {
    super(light);

    /**
     * Uniform node representing the half height of the are light.
     *
     * @type {UniformNode<vec3>}
     */
    this.halfHeight = uniform(new Vector3()).setGroup(renderGroup);

    /**
     * Uniform node representing the half width of the are light.
     *
     * @type {UniformNode<vec3>}
     */
    this.halfWidth = uniform(new Vector3()).setGroup(renderGroup);

    /**
     * The `updateType` is set to `NodeUpdateType.RENDER` since the light
     * relies on `viewMatrix` which might vary per render call.
     *
     * @type {string}
     * @default 'render'
     */
    this.updateType = NodeUpdateType.RENDER;
  }

  /**
   * Overwritten to updated rect area light specific uniforms.
   *
   * @param {NodeFrame} frame - A reference to the current node frame.
   */
  update(frame) {
    super.update(frame);
    const {
      light
    } = this;
    const viewMatrix = frame.camera.matrixWorldInverse;
    _matrix42.identity();
    _matrix41.copy(light.matrixWorld);
    _matrix41.premultiply(viewMatrix);
    _matrix42.extractRotation(_matrix41);
    this.halfWidth.value.set(light.width * 0.5, 0.0, 0.0);
    this.halfHeight.value.set(0.0, light.height * 0.5, 0.0);
    this.halfWidth.value.applyMatrix4(_matrix42);
    this.halfHeight.value.applyMatrix4(_matrix42);
  }
  setupDirectRectArea(builder) {
    let ltc_1, ltc_2;
    if (builder.isAvailable('float32Filterable')) {
      ltc_1 = texture(_ltcLib.LTC_FLOAT_1);
      ltc_2 = texture(_ltcLib.LTC_FLOAT_2);
    } else {
      ltc_1 = texture(_ltcLib.LTC_HALF_1);
      ltc_2 = texture(_ltcLib.LTC_HALF_2);
    }
    const {
      colorNode,
      light
    } = this;
    const lightPosition = lightViewPosition(light);
    return {
      lightColor: colorNode,
      lightPosition,
      halfWidth: this.halfWidth,
      halfHeight: this.halfHeight,
      ltc_1,
      ltc_2
    };
  }

  /**
   * Used to configure the internal BRDF approximation texture data.
   *
   * @param {RectAreaLightTexturesLib} ltc - The BRDF approximation texture data.
   */
  static setLTC(ltc) {
    _ltcLib = ltc;
  }
}
export default RectAreaLightNode;