feat: initialize project with core dependencies and game entry point

node_modules/three/examples/jsm/helpers/VertexTangentsHelper.js

@@ -0,0 +1,133 @@
+import {
+	BufferGeometry,
+	Float32BufferAttribute,
+	LineSegments,
+	LineBasicMaterial,
+	Vector3
+} from 'three';
+
+const _v1 = new Vector3();
+const _v2 = new Vector3();
+
+/**
+ * Visualizes an object's vertex tangents.
+ *
+ * Requires that tangents have been specified in the geometry as a buffer attribute or
+ * have been calculated using {@link BufferGeometry#computeTangents}.
+ * ```js
+ * const helper = new VertexTangentsHelper( mesh, 1, 0xff0000 );
+ * scene.add( helper );
+ * ```
+ *
+ * @augments LineSegments
+ * @three_import import { VertexTangentsHelper } from 'three/addons/helpers/VertexTangentsHelper.js';
+ */
+class VertexTangentsHelper extends LineSegments {
+
+	/**
+	 * Constructs a new vertex tangents helper.
+	 *
+	 * @param {Object3D} object - The object for which to visualize vertex tangents.
+	 * @param {number} [size=1] - The helper's size.
+	 * @param {number|Color|string} [color=0xff0000] - The helper's color.
+	 */
+	constructor( object, size = 1, color = 0x00ffff ) {
+
+		const geometry = new BufferGeometry();
+
+		const nTangents = object.geometry.attributes.tangent.count;
+		const positions = new Float32BufferAttribute( nTangents * 2 * 3, 3 );
+
+		geometry.setAttribute( 'position', positions );
+
+		super( geometry, new LineBasicMaterial( { color, toneMapped: false } ) );
+
+		/**
+		 * The object for which to visualize vertex tangents.
+		 *
+		 * @type {Object3D}
+		 */
+		this.object = object;
+
+		/**
+		 * The helper's size.
+		 *
+		 * @type {number}
+		 * @default 1
+		 */
+		this.size = size;
+
+		this.type = 'VertexTangentsHelper';
+
+		/**
+		 * Overwritten and set to `false` since the object's world transformation
+		 * is encoded in the helper's geometry data.
+		 *
+		 * @type {boolean}
+		 * @default false
+		 */
+		this.matrixAutoUpdate = false;
+
+		this.update();
+
+	}
+
+	/**
+	 * Updates the vertex normals preview based on the object's world transform.
+	 */
+	update() {
+
+		this.object.updateMatrixWorld( true );
+
+		const matrixWorld = this.object.matrixWorld;
+
+		const position = this.geometry.attributes.position;
+
+		//
+
+		const objGeometry = this.object.geometry;
+
+		const objPos = objGeometry.attributes.position;
+
+		const objTan = objGeometry.attributes.tangent;
+
+		let idx = 0;
+
+		// for simplicity, ignore index and drawcalls, and render every tangent
+
+		for ( let j = 0, jl = objPos.count; j < jl; j ++ ) {
+
+			_v1.fromBufferAttribute( objPos, j ).applyMatrix4( matrixWorld );
+
+			_v2.fromBufferAttribute( objTan, j );
+
+			_v2.transformDirection( matrixWorld ).multiplyScalar( this.size ).add( _v1 );
+
+			position.setXYZ( idx, _v1.x, _v1.y, _v1.z );
+
+			idx = idx + 1;
+
+			position.setXYZ( idx, _v2.x, _v2.y, _v2.z );
+
+			idx = idx + 1;
+
+		}
+
+		position.needsUpdate = true;
+
+	}
+
+	/**
+	 * Frees the GPU-related resources allocated by this instance. Call this
+	 * method whenever this instance is no longer used in your app.
+	 */
+	dispose() {
+
+		this.geometry.dispose();
+		this.material.dispose();
+
+	}
+
+}
+
+export { VertexTangentsHelper };