Added fromBufferGeometry() method to Geometry.

src/core/Geometry.js

@@ -95,6 +95,92 @@ THREE.Geometry.prototype = {
 
 	},
 
+	fromBufferGeometry: function ( geometry ) {
+
+		var scope = this;
+
+		var attributes = geometry.attributes;
+
+		var indices = attributes.index !== undefined && attributes.index.array;
+		var normals = attributes.normal !== undefined && attributes.normal.array;
+		var colors = attributes.color !== undefined && attributes.color.array;
+		var uvs = attributes.uv !== undefined && attributes.uv.array;
+
+		var vertices = attributes.position.array;
+
+		var tempNormals = [];
+		var tempUVs = [];
+
+		for ( var i = 0, j = 0; i < vertices.length; i += 3, j += 2 ) {
+
+			scope.vertices.push( new THREE.Vector3( vertices[ i ], vertices[ i + 1 ], vertices[ i + 2 ] ) );
+
+			if ( normals !== undefined ) {
+
+				tempNormals.push( new THREE.Vector3( normals[ i ], normals[ i + 1 ], normals[ i + 2 ] ) );
+
+			}
+
+			if ( colors !== undefined ) {
+
+				scope.colors.push( new THREE.Color( colors[ i ], colors[ i + 1 ], colors[ i + 2 ] ) );
+
+			}
+
+			if ( uvs !== undefined ) {
+
+				tempUVs.push( new THREE.Vector2( uvs[ j ], uvs[ j + 1 ] ) );
+
+			}
+
+		}
+
+		var addFace = function ( a, b, c ) {
+
+			var vertexNormals = normals !== undefined ? [ tempNormals[ a ], tempNormals[ b ], tempNormals[ c ] ] : [];
+			var vertexColors = colors !== undefined ? [ scope.colors[ a ], scope.colors[ b ], scope.colors[ c ] ] : [];
+
+			scope.faces.push( new THREE.Face3( a, b, c, vertexNormals, vertexColors ) );
+			scope.faceVertexUvs[ 0 ].push( [ tempUVs[ a ], tempUVs[ b ], tempUVs[ c ] ] );
+
+		};
+
+		if ( indices !== undefined ) {
+
+			var indices = attributes.index.array;
+
+			for ( var i = 0; i < indices.length; i += 3 ) {
+
+				addFace( indices[ i ], indices[ i + 1 ], indices[ i + 2 ] );
+
+			}
+
+		} else {
+
+			for ( var i = 0; i < vertices.length / 3; i += 3 ) {
+
+				addFace( i, i + 1, i + 2 );
+
+			}
+
+		}
+
+		if ( geometry.boundingBox !== null ) {
+
+			this.boundingBox = geometry.boundingBox.clone();
+
+		}
+
+		if ( geometry.boundingSphere !== null ) {
+
+			this.boundingSphere = geometry.boundingSphere.clone();
+
+		}
+
+		return this;
+
+	},
+
 	center: function () {
 
 		this.computeBoundingBox();