Updated builds.

build/three.js

@@ -35033,32 +35033,40 @@ THREE.WireframeHelper = function ( object ) {
 
 		}
 
-	} else {
+	} else if ( object.geometry.offsets ) {
 
 		var vertices = object.geometry.attributes.position.array;
-		var faces = object.geometry.attributes.index.array;
+		var indices = object.geometry.attributes.index.array;
+		var offsets = object.geometry.offsets
 
 		// allocate maximal size
-		var edges = new Uint32Array(2 * faces.length);
+		var edges = new Uint32Array(2 * indices.length);
 
-		for ( var i = 0, l = faces.length / 3; i < l; i ++ ) {
+		for ( var o = 0, ol = offsets.length; o < ol; ++ o ) {
 
-			for ( var j = 0; j < 3; j ++ ) {
+			var start = offsets[ o ].start;
+			var count = offsets[ o ].count;
+			var index = offsets[ o ].index;
+			var il;
 
-				var index = i * 3;
+			for ( var i = start, il = start + count; i < il; i += 3 ) {
 
-				edge[ 0 ] = faces[ index + j ];
-				edge[ 1 ] = faces[ index + ( j + 1 ) % 3 ];
-				edge.sort( sortFunction );
+				for ( var j = 0; j < 3; j ++ ) {
 
-				var key = edge.toString();
+					edge[ 0 ] = index + indices[ i + j ];
+					edge[ 1 ] = index + indices[ i + ( j + 1 ) % 3 ];
+					edge.sort( sortFunction );
 
-				if ( hash[ key ] === undefined ) {
+					var key = edge.toString();
 
-					edges[ 2 * numEdges ] = edge[ 0 ];
-					edges[ 2 * numEdges + 1 ] = edge[ 1 ];
-					hash[ key ] = true;
-					numEdges ++;
+					if ( hash[ key ] === undefined ) {
+
+						edges[ 2 * numEdges ] = edge[ 0 ];
+						edges[ 2 * numEdges + 1 ] = edge[ 1 ];
+						hash[ key ] = true;
+						numEdges ++;
+
+					}
 
 				}
 
@@ -35083,6 +35091,36 @@ THREE.WireframeHelper = function ( object ) {
 			}
 
 		}
+	} else {
+
+		var vertices = object.geometry.attributes.position.array;
+		var numEdges = vertices.length / 3;
+		var numTris = numEdges / 3;
+
+		geometry.addAttribute( 'position', Float32Array, 2 * numEdges , 3 );
+		var coords = geometry.attributes.position.array;
+
+		for ( var i = 0, l = numTris; i < l; i ++ ) {
+
+			var index = i * 9;
+			var index2 = 2 * index;
+
+			for ( var j = 0; j < 3; j ++ ) {
+
+				var vertex1 = j * 3;
+				var vertex2 = ( ( j + 1 ) % 3 ) * 3;
+				coords[ index2 + 0 ] = vertices[ index + vertex1 ];
+				coords[ index2 + 1 ] = vertices[ index + vertex1 + 1 ];
+				coords[ index2 + 2 ] = vertices[ index + vertex1 + 2 ];
+
+				coords[ index2 + 3 ] = vertices[ index + vertex2 ];
+				coords[ index2 + 4 ] = vertices[ index + vertex2 + 1 ];
+				coords[ index2 + 5 ] = vertices[ index + vertex2 + 2 ];
+
+			}
+
+		}
+
 	}
 
 	THREE.Line.call( this, geometry, new THREE.LineBasicMaterial( { color: 0xffffff } ), THREE.LinePieces );