Clean up.

src/geometries/CylinderGeometry.js

@@ -66,7 +66,7 @@ function CylinderBufferGeometry( radiusTop, radiusBottom, height, radialSegments
 
 	openEnded = openEnded !== undefined ? openEnded : false;
 	thetaStart = thetaStart !== undefined ? thetaStart : 0.0;
-	thetaLength = thetaLength !== undefined ? thetaLength : 2.0 * Math.PI;
+	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
 
 	// buffers