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

Open Hybrid Positioning System - Core component

import AnalyticLightNode from './AnalyticLightNode.js';
import { getDistanceAttenuation } from './LightUtils.js';
import { uniform } from '../core/UniformNode.js';
import { renderGroup } from '../core/UniformGroupNode.js';
import { pointShadow } from './PointShadowNode.js';
export const directPointLight = ({
  color,
  lightVector,
  cutoffDistance,
  decayExponent
}) => {
  const lightDirection = lightVector.normalize();
  const lightDistance = lightVector.length();
  const attenuation = getDistanceAttenuation({
    lightDistance,
    cutoffDistance,
    decayExponent
  });
  const lightColor = color.mul(attenuation);
  return {
    lightDirection,
    lightColor
  };
};

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

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

    /**
     * Uniform node representing the cutoff distance.
     *
     * @type {UniformNode<float>}
     */
    this.cutoffDistanceNode = uniform(0).setGroup(renderGroup);

    /**
     * Uniform node representing the decay exponent.
     *
     * @type {UniformNode<float>}
     */
    this.decayExponentNode = uniform(2).setGroup(renderGroup);
  }

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

  /**
   * Overwritten to setup point light specific shadow.
   *
   * @return {PointShadowNode}
   */
  setupShadowNode() {
    return pointShadow(this.light);
  }
  setupDirect(builder) {
    return directPointLight({
      color: this.colorNode,
      lightVector: this.getLightVector(builder),
      cutoffDistance: this.cutoffDistanceNode,
      decayExponent: this.decayExponentNode
    });
  }
}
export default PointLightNode;