CircleBufferGeometry: fix normals bug

src/extras/geometries/CircleBufferGeometry.js

@@ -28,7 +28,7 @@ THREE.CircleBufferGeometry = function ( radius, segments, thetaStart, thetaLengt
 	var uvs = new Float32Array( vertices * 2 );
 
 	// center data is already zero, but need to set a few extras
-	normals[ 3 ] = 1.0;
+	normals[ 2 ] = 1.0;
 	uvs[ 0 ] = 0.5;
 	uvs[ 1 ] = 0.5;