@openhps/core/src/three/nodes/lighting/HemisphereLightNode.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _AnalyticLightNode = _interopRequireDefault(require("./AnalyticLightNode.js"));
var _UniformNode = require("../core/UniformNode.js");
var _MathNode = require("../math/MathNode.js");
var _Normal = require("../accessors/Normal.js");
var _Lights = require("../accessors/Lights.js");
var _UniformGroupNode = require("../core/UniformGroupNode.js");
var _Color = require("../../math/Color.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
 * Module for representing hemisphere lights as nodes.
 *
 * @augments AnalyticLightNode
 */
class HemisphereLightNode extends _AnalyticLightNode.default {
  static get type() {
    return 'HemisphereLightNode';
  }

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

    /**
     * Uniform node representing the light's position.
     *
     * @type {UniformNode<vec3>}
     */
    this.lightPositionNode = (0, _Lights.lightPosition)(light);

    /**
     * A node representing the light's direction.
     *
     * @type {Node<vec3>}
     */
    this.lightDirectionNode = this.lightPositionNode.normalize();

    /**
     * Uniform node representing the light's ground color.
     *
     * @type {UniformNode<vec3>}
     */
    this.groundColorNode = (0, _UniformNode.uniform)(new _Color.Color()).setGroup(_UniformGroupNode.renderGroup);
  }

  /**
   * Overwritten to updated hemisphere light specific uniforms.
   *
   * @param {NodeFrame} frame - A reference to the current node frame.
   */
  update(frame) {
    const {
      light
    } = this;
    super.update(frame);
    this.lightPositionNode.object3d = light;
    this.groundColorNode.value.copy(light.groundColor).multiplyScalar(light.intensity);
  }
  setup(builder) {
    const {
      colorNode,
      groundColorNode,
      lightDirectionNode
    } = this;
    const dotNL = _Normal.normalView.dot(lightDirectionNode);
    const hemiDiffuseWeight = dotNL.mul(0.5).add(0.5);
    const irradiance = (0, _MathNode.mix)(groundColorNode, colorNode, hemiDiffuseWeight);
    builder.context.irradiance.addAssign(irradiance);
  }
}
var _default = exports.default = HemisphereLightNode;