@openhps/core/dist/esm/three/nodes/accessors/Tangent.js

Open Hybrid Positioning System - Core component

import { attribute } from '../core/AttributeNode.js';
import { cameraViewMatrix } from './Camera.js';
import { modelViewMatrix } from './ModelNode.js';
import { Fn, vec4 } from '../tsl/TSLBase.js';

/**
 * TSL object that represents the tangent attribute of the current rendered object.
 *
 * @tsl
 * @type {Node<vec4>}
 */
export const tangentGeometry = /*@__PURE__*/Fn(builder => {
  if (builder.geometry.hasAttribute('tangent') === false) {
    builder.geometry.computeTangents();
  }
  return attribute('tangent', 'vec4');
})();

/**
 * TSL object that represents the vertex tangent in local space of the current rendered object.
 *
 * @tsl
 * @type {Node<vec3>}
 */
export const tangentLocal = /*@__PURE__*/tangentGeometry.xyz.toVar('tangentLocal');

/**
 * TSL object that represents the vertex tangent in view space of the current rendered object.
 *
 * @tsl
 * @type {Node<vec3>}
 */
export const tangentView = /*@__PURE__*/modelViewMatrix.mul(vec4(tangentLocal, 0)).xyz.toVarying('v_tangentView').normalize().toVar('tangentView');

/**
 * TSL object that represents the vertex tangent in world space of the current rendered object.
 *
 * @tsl
 * @type {Node<vec3>}
 */
export const tangentWorld = /*@__PURE__*/tangentView.transformDirection(cameraViewMatrix).toVarying('v_tangentWorld').normalize().toVar('tangentWorld');

/**
 * TSL object that represents the transformed vertex tangent in view space of the current rendered object.
 *
 * @tsl
 * @type {Node<vec3>}
 */
export const transformedTangentView = /*@__PURE__*/tangentView.toVar('transformedTangentView');

/**
 * TSL object that represents the transformed vertex tangent in world space of the current rendered object.
 *
 * @tsl
 * @type {Node<vec3>}
 */
export const transformedTangentWorld = /*@__PURE__*/transformedTangentView.transformDirection(cameraViewMatrix).normalize().toVar('transformedTangentWorld');