Add .toJSON to BufferAttribute

Author: Temdog007

src/core/BufferAttribute.js

@@ -319,6 +319,16 @@ Object.assign( BufferAttribute.prototype, {
 
 		return new this.constructor( this.array, this.itemSize ).copy( this );
 
+	},
+
+	toJSON: function() {
+
+		return {
+			itemSize: this.itemSize,
+			type: this.array.constructor.name,
+			array: Array.prototype.slice.call( this.array ),
+			normalized: this.normalized
+		};
 	}
 
 } );

src/core/BufferGeometry.js

@@ -1063,12 +1063,7 @@ BufferGeometry.prototype = Object.assign( Object.create( EventDispatcher.prototy
 
 			var attribute = attributes[ key ];
 
-			var attributeData = {
-				itemSize: attribute.itemSize,
-				type: attribute.array.constructor.name,
-				array: Array.prototype.slice.call( attribute.array ),
-				normalized: attribute.normalized
-			};
+			var attributeData = attribute.toJSON();
 
 			if ( attribute.name !== '' ) attributeData.name = attribute.name;
 
@@ -1089,12 +1084,7 @@ BufferGeometry.prototype = Object.assign( Object.create( EventDispatcher.prototy
 
 				var attribute = attributeArray[ i ];
 
-				var attributeData = {
-					itemSize: attribute.itemSize,
-					type: attribute.array.constructor.name,
-					array: Array.prototype.slice.call( attribute.array ),
-					normalized: attribute.normalized
-				};
+				var attributeData = attribute.toJSON();
 
 				if ( attribute.name !== '' ) attributeData.name = attribute.name;
 

src/core/InstancedBufferAttribute.js

@@ -36,6 +36,18 @@ InstancedBufferAttribute.prototype = Object.assign( Object.create( BufferAttribu
 
 		return this;
 
+	},
+
+	toJSON: function ()	{
+
+		var data = BufferAttribute.prototype.toJSON.call( this );
+
+		data.meshPerAttribute = this.meshPerAttribute;
+
+		data.isInstancedBufferAttribute = true;
+
+		return data;
+
 	}
 
 } );