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

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _SpotLightNode = _interopRequireDefault(require("./SpotLightNode.js"));
var _TextureNode = require("../accessors/TextureNode.js");
var _TSLBase = require("../tsl/TSLBase.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
 * An IES version of the default spot light node.
 *
 * @augments SpotLightNode
 */
class IESSpotLightNode extends _SpotLightNode.default {
  static get type() {
    return 'IESSpotLightNode';
  }

  /**
   * Overwrites the default implementation to compute an IES conform spot attenuation.
   *
   * @param {Node<float>} angleCosine - The angle to compute the spot attenuation for.
   * @return {Node<float>} The spot attenuation.
   */
  getSpotAttenuation(angleCosine) {
    const iesMap = this.light.iesMap;
    let spotAttenuation = null;
    if (iesMap && iesMap.isTexture === true) {
      const angle = angleCosine.acos().mul(1.0 / Math.PI);
      spotAttenuation = (0, _TextureNode.texture)(iesMap, (0, _TSLBase.vec2)(angle, 0), 0).r;
    } else {
      spotAttenuation = super.getSpotAttenuation(angleCosine);
    }
    return spotAttenuation;
  }
}
var _default = exports.default = IESSpotLightNode;