@openhps/core/dist/esm/three/nodes/utils/EquirectUVNode.js

Open Hybrid Positioning System - Core component

import TempNode from '../core/TempNode.js';
import { positionWorldDirection } from '../accessors/Position.js';
import { nodeProxy, vec2 } from '../tsl/TSLBase.js';

/**
 * Can be used to compute texture coordinates for projecting an
 * equirectangular texture onto a mesh for using it as the scene's
 * background.
 *
 * ```js
 * scene.backgroundNode = texture( equirectTexture, equirectUV() );
 * ```
 *
 * @augments TempNode
 */
class EquirectUVNode extends TempNode {
  static get type() {
    return 'EquirectUVNode';
  }

  /**
   * Constructs a new equirect uv node.
   *
   * @param {Node<vec3>} [dirNode=positionWorldDirection] - A direction vector for sampling which is by default `positionWorldDirection`.
   */
  constructor(dirNode = positionWorldDirection) {
    super('vec2');

    /**
     * A direction vector for sampling why is by default `positionWorldDirection`.
     *
     * @type {Node<vec3>}
     */
    this.dirNode = dirNode;
  }
  setup() {
    const dir = this.dirNode;
    const u = dir.z.atan(dir.x).mul(1 / (Math.PI * 2)).add(0.5);
    const v = dir.y.clamp(-1.0, 1.0).asin().mul(1 / Math.PI).add(0.5);
    return vec2(u, v);
  }
}
export default EquirectUVNode;

/**
 * TSL function for creating an equirect uv node.
 *
 * @tsl
 * @function
 * @param {?Node<vec3>} [dirNode=positionWorldDirection] - A direction vector for sampling which is by default `positionWorldDirection`.
 * @returns {EquirectUVNode}
 */
export const equirectUV = /*@__PURE__*/nodeProxy(EquirectUVNode).setParameterLength(0, 1);