Some embodiments provide a non-transitory machine-readable medium that stores a program executable by at least one processing unit of a device. The program provides a display area for viewing a 3D model that includes a plurality of three-dimensional (3D) objects. The program further provides a tool for viewing 3D objects in the 3D model. The program also determines a 3D object in the plurality of 3D objects in the 3D model to hide. The program further hides the determined 3D object in the 3D model.