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

Open Hybrid Positioning System - Core component

import AnalyticLightNode from './AnalyticLightNode.js';
import { normalWorld } from '../accessors/Normal.js';
import { uniformArray } from '../accessors/UniformArrayNode.js';
import { Vector3 } from '../../math/Vector3.js';
import getShIrradianceAt from '../functions/material/getShIrradianceAt.js';

/**
 * Module for representing light probes as nodes.
 *
 * @augments AnalyticLightNode
 */
class LightProbeNode extends AnalyticLightNode {
  static get type() {
    return 'LightProbeNode';
  }

  /**
   * Constructs a new light probe node.
   *
   * @param {?LightProbe} [light=null] - The light probe.
   */
  constructor(light = null) {
    super(light);
    const array = [];
    for (let i = 0; i < 9; i++) array.push(new Vector3());

    /**
     * Light probe represented as a uniform of spherical harmonics.
     *
     * @type {UniformArrayNode}
     */
    this.lightProbe = uniformArray(array);
  }

  /**
   * Overwritten to updated light probe specific uniforms.
   *
   * @param {NodeFrame} frame - A reference to the current node frame.
   */
  update(frame) {
    const {
      light
    } = this;
    super.update(frame);

    //

    for (let i = 0; i < 9; i++) {
      this.lightProbe.array[i].copy(light.sh.coefficients[i]).multiplyScalar(light.intensity);
    }
  }
  setup(builder) {
    const irradiance = getShIrradianceAt(normalWorld, this.lightProbe);
    builder.context.irradiance.addAssign(irradiance);
  }
}
export default LightProbeNode;