@openhps/core/src/three/nodes/utils/MatcapUVNode.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.matcapUV = exports.default = void 0;
var _TempNode = _interopRequireDefault(require("../core/TempNode.js"));
var _Normal = require("../accessors/Normal.js");
var _Position = require("../accessors/Position.js");
var _TSLBase = require("../tsl/TSLBase.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
 * Can be used to compute texture coordinates for projecting a
 * matcap onto a mesh. Used by {@link MeshMatcapNodeMaterial}.
 *
 * @augments TempNode
 */
class MatcapUVNode extends _TempNode.default {
  static get type() {
    return 'MatcapUVNode';
  }

  /**
   * Constructs a new matcap uv node.
   */
  constructor() {
    super('vec2');
  }
  setup() {
    const x = (0, _TSLBase.vec3)(_Position.positionViewDirection.z, 0, _Position.positionViewDirection.x.negate()).normalize();
    const y = _Position.positionViewDirection.cross(x);
    return (0, _TSLBase.vec2)(x.dot(_Normal.transformedNormalView), y.dot(_Normal.transformedNormalView)).mul(0.495).add(0.5); // 0.495 to remove artifacts caused by undersized matcap disks
  }
}
var _default = exports.default = MatcapUVNode;
/**
 * TSL function for creating a matcap uv node.
 *
 * @tsl
 * @function
 * @returns {MatcapUVNode}
 */
const matcapUV = exports.matcapUV = /*@__PURE__*/(0, _TSLBase.nodeImmutable)(MatcapUVNode);