BufferGeometry/Loader: Handle index.

src/core/BufferGeometry.js

@@ -1084,10 +1084,20 @@ THREE.BufferGeometry.prototype = {
 
 		data.data = { attributes: {} };
 
-		var attributes = this.attributes;
-		var groups = this.groups;
+		var index = this.index;
 
-		var boundingSphere = this.boundingSphere;
+		if ( index !== null ) {
+
+			var array = Array.prototype.slice.call( index.array );
+
+			data.data.index = {
+				type: index.array.constructor.name,
+				array: array
+			};
+
+		}
+
+		var attributes = this.attributes;
 
 		for ( var key in attributes ) {
 
@@ -1103,12 +1113,16 @@ THREE.BufferGeometry.prototype = {
 
 		}
 
+		var groups = this.groups;
+
 		if ( groups.length > 0 ) {
 
 			data.data.groups = JSON.parse( JSON.stringify( groups ) );
 
 		}
 
+		var boundingSphere = this.boundingSphere;
+
 		if ( boundingSphere !== null ) {
 
 			data.data.boundingSphere = {

src/loaders/BufferGeometryLoader.js

@@ -36,6 +36,15 @@ THREE.BufferGeometryLoader.prototype = {
 
 		var geometry = new THREE.BufferGeometry();
 
+		var index = json.data.index;
+
+		if ( index !== undefined ) {
+
+			var typedArray = new self[ index.type ]( index.array );
+			geometry.addIndex( new THREE.BufferAttribute( typedArray, 1 ) );
+
+		}
+
 		var attributes = json.data.attributes;
 
 		for ( var key in attributes ) {