feat: initialize project with core dependencies and game entry point

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

@@ -0,0 +1,109 @@
+import {
+	LineSegments,
+	BufferGeometry,
+	Float32BufferAttribute,
+	LineBasicMaterial
+} from 'three';
+
+/**
+ * A helper for visualizing an Octree.
+ *
+ * ```js
+ * const helper = new OctreeHelper( octree );
+ * scene.add( helper );
+ * ```
+ *
+ * @augments LineSegments
+ * @three_import import { OctreeHelper } from 'three/addons/helpers/OctreeHelper.js';
+ */
+class OctreeHelper extends LineSegments {
+
+	/**
+	 * Constructs a new Octree helper.
+	 *
+	 * @param {Octree} octree - The octree to visualize.
+	 * @param {number|Color|string} [color=0xffff00] - The helper's color.
+	 */
+	constructor( octree, color = 0xffff00 ) {
+
+		super( new BufferGeometry(), new LineBasicMaterial( { color: color, toneMapped: false } ) );
+
+		/**
+		 * The octree to visualize.
+		 *
+		 * @type {Octree}
+		 */
+		this.octree = octree;
+
+		/**
+		 * The helper's color.
+		 *
+		 * @type {number|Color|string}
+		 */
+		this.color = color;
+
+		this.type = 'OctreeHelper';
+
+		this.update();
+
+	}
+
+	/**
+	 * Updates the helper. This method must be called whenever the Octree's
+	 * structure is changed.
+	 */
+	update() {
+
+		const vertices = [];
+
+		function traverse( tree ) {
+
+			for ( let i = 0; i < tree.length; i ++ ) {
+
+				const min = tree[ i ].box.min;
+				const max = tree[ i ].box.max;
+
+				vertices.push( max.x, max.y, max.z ); vertices.push( min.x, max.y, max.z ); // 0, 1
+				vertices.push( min.x, max.y, max.z ); vertices.push( min.x, min.y, max.z ); // 1, 2
+				vertices.push( min.x, min.y, max.z ); vertices.push( max.x, min.y, max.z ); // 2, 3
+				vertices.push( max.x, min.y, max.z ); vertices.push( max.x, max.y, max.z ); // 3, 0
+
+				vertices.push( max.x, max.y, min.z ); vertices.push( min.x, max.y, min.z ); // 4, 5
+				vertices.push( min.x, max.y, min.z ); vertices.push( min.x, min.y, min.z ); // 5, 6
+				vertices.push( min.x, min.y, min.z ); vertices.push( max.x, min.y, min.z ); // 6, 7
+				vertices.push( max.x, min.y, min.z ); vertices.push( max.x, max.y, min.z ); // 7, 4
+
+				vertices.push( max.x, max.y, max.z ); vertices.push( max.x, max.y, min.z ); // 0, 4
+				vertices.push( min.x, max.y, max.z ); vertices.push( min.x, max.y, min.z ); // 1, 5
+				vertices.push( min.x, min.y, max.z ); vertices.push( min.x, min.y, min.z ); // 2, 6
+				vertices.push( max.x, min.y, max.z ); vertices.push( max.x, min.y, min.z ); // 3, 7
+
+				traverse( tree[ i ].subTrees );
+
+			}
+
+		}
+
+		traverse( this.octree.subTrees );
+
+		this.geometry.dispose();
+
+		this.geometry = new BufferGeometry();
+		this.geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+
+	}
+
+	/**
+	 * 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 { OctreeHelper };