as per Mr. Doob's Request, I removed hilbert2d from the folder.

src/extras/geometries/hilbert2D.js

@@ -1,60 +0,0 @@
-/**
- * Hilbert Curve: Generates 2D-Coordinates in a very fast way.
- *
- * @author Dylan Grafmyre
- *
- * Based on work by:
- * @author Thomas Diewald
- * @link http://www.openprocessing.org/sketch/15493
- *
- * @param center     Center of Hilbert curve.
- * @param size       Total width of Hilbert curve.
- * @param iterations Number of subdivisions.
- * @param v1         Corner index -X, -Z.
- * @param v2         Corner index -X, +Z.
- * @param v3         Corner index +X, +Z.
- * @param v4         Corner index +X, -Z.
- */
-function hilbert2D (center, size, iterations, v0, v1, v2, v3) {
-	// Default Vars
-	var center     = undefined !== center ? center : new THREE.Vector3(0, 0, 0),
-		size       = undefined !== size ? size : 10,
-		size       = undefined !== side ? side : 10,
-		half       = size / 2,
-		iterations = undefined !== iterations ? iterations : 1,
-		v0 = undefined !== v0 ? v0 : 0,
-		v1 = undefined !== v1 ? v1 : 1,
-		v2 = undefined !== v2 ? v2 : 2,
-		v3 = undefined !== v3 ? v3 : 3
-	;
-
-	var vec_s = [
-		new THREE.Vector3(center.x - half, center.y, center.z - half),
-		new THREE.Vector3(center.x - half, center.y, center.z + half),
-		new THREE.Vector3(center.x + half, center.y, center.z + half),
-		new THREE.Vector3(center.x + half, center.y, center.z - half)
-	];
-
-	var vec = [
-		vec_s[ v0 ],
-		vec_s[ v1 ],
-		vec_s[ v2 ],
-		vec_s[ v3 ]
-	];
-
-	// Recurse iterations
-	if (0 <= --iterations) {
-		var tmp = [];
-
-		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 0 ], half, iterations, v0, v3, v2, v1 ) );
-		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 1 ], half, iterations, v0, v1, v2, v3 ) );
-		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 2 ], half, iterations, v0, v1, v2, v3 ) );
-		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 3 ], half, iterations, v2, v1, v0, v3 ) );
-
-		// Return recursive call
-		return tmp;
-	}
-
-	// Return complete Hilbert Curve.
-	return vec;
-}