Indexed BoxHelper.

@WestLangley as far as I can see, BoundingBoxHelper is no longer needed?

src/extras/helpers/BoxHelper.js

@@ -4,8 +4,12 @@
 
 THREE.BoxHelper = function ( object ) {
 
+	var indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );
+	var positions = new Float32Array( 8 * 3 );
+
 	var geometry = new THREE.BufferGeometry();
-	geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( 72 ), 3 ) );
+	geometry.addAttribute( 'index', new THREE.IndexBufferAttribute( indices, 1 ) );
+	geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
 
 	THREE.LineSegments.call( this, geometry, new THREE.LineBasicMaterial( { color: 0xffff00 } ) );
 
@@ -49,49 +53,19 @@ THREE.BoxHelper.prototype.update = ( function () {
 		7: max.x, min.y, min.z
 		*/
 
-		var vertices = this.geometry.attributes.position.array;
-
-		vertices[ 0 ] = max.x; vertices[ 1 ] = max.y; vertices[ 2 ] = max.z;
-		vertices[ 3 ] = min.x; vertices[ 4 ] = max.y; vertices[ 5 ] = max.z;
-
-		vertices[ 6 ] = min.x; vertices[ 7 ] = max.y; vertices[ 8 ] = max.z;
-		vertices[ 9 ] = min.x; vertices[ 10 ] = min.y; vertices[ 11 ] = max.z;
-
-		vertices[ 12 ] = min.x; vertices[ 13 ] = min.y; vertices[ 14 ] = max.z;
-		vertices[ 15 ] = max.x; vertices[ 16 ] = min.y; vertices[ 17 ] = max.z;
-
-		vertices[ 18 ] = max.x; vertices[ 19 ] = min.y; vertices[ 20 ] = max.z;
-		vertices[ 21 ] = max.x; vertices[ 22 ] = max.y; vertices[ 23 ] = max.z;
-
-		//
-
-		vertices[ 24 ] = max.x; vertices[ 25 ] = max.y; vertices[ 26 ] = min.z;
-		vertices[ 27 ] = min.x; vertices[ 28 ] = max.y; vertices[ 29 ] = min.z;
-
-		vertices[ 30 ] = min.x; vertices[ 31 ] = max.y; vertices[ 32 ] = min.z;
-		vertices[ 33 ] = min.x; vertices[ 34 ] = min.y; vertices[ 35 ] = min.z;
-
-		vertices[ 36 ] = min.x; vertices[ 37 ] = min.y; vertices[ 38 ] = min.z;
-		vertices[ 39 ] = max.x; vertices[ 40 ] = min.y; vertices[ 41 ] = min.z;
-
-		vertices[ 42 ] = max.x; vertices[ 43 ] = min.y; vertices[ 44 ] = min.z;
-		vertices[ 45 ] = max.x; vertices[ 46 ] = max.y; vertices[ 47 ] = min.z;
-
-		//
-
-		vertices[ 48 ] = max.x; vertices[ 49 ] = max.y; vertices[ 50 ] = max.z;
-		vertices[ 51 ] = max.x; vertices[ 52 ] = max.y; vertices[ 53 ] = min.z;
-
-		vertices[ 54 ] = min.x; vertices[ 55 ] = max.y; vertices[ 56 ] = max.z;
-		vertices[ 57 ] = min.x; vertices[ 58 ] = max.y; vertices[ 59 ] = min.z;
-
-		vertices[ 60 ] = min.x; vertices[ 61 ] = min.y; vertices[ 62 ] = max.z;
-		vertices[ 63 ] = min.x; vertices[ 64 ] = min.y; vertices[ 65 ] = min.z;
+		var position = this.geometry.attributes.position;
+		var array = position.array;
 
-		vertices[ 66 ] = max.x; vertices[ 67 ] = min.y; vertices[ 68 ] = max.z;
-		vertices[ 69 ] = max.x; vertices[ 70 ] = min.y; vertices[ 71 ] = min.z;
+		array[  0 ] = max.x; array[  1 ] = max.y; array[  2 ] = max.z;
+		array[  3 ] = min.x; array[  4 ] = max.y; array[  5 ] = max.z;
+		array[  6 ] = min.x; array[  7 ] = min.y; array[  8 ] = max.z;
+		array[  9 ] = max.x; array[ 10 ] = min.y; array[ 11 ] = max.z;
+		array[ 12 ] = max.x; array[ 13 ] = max.y; array[ 14 ] = min.z;
+		array[ 15 ] = min.x; array[ 16 ] = max.y; array[ 17 ] = min.z;
+		array[ 18 ] = min.x; array[ 19 ] = min.y; array[ 20 ] = min.z;
+		array[ 21 ] = max.x; array[ 22 ] = min.y; array[ 23 ] = min.z;
 
-		this.geometry.attributes.position.needsUpdate = true;
+		position.needsUpdate = true;
 
 		this.geometry.computeBoundingSphere();