Abstract
An input device for editing a 3D model displayed in a screen is provided. The input device includes a signal transceiver module and a telescopic sensing component. The signal transceiver module communicates with a graphic system to obtain information of the 3D model. The signal transceiver module includes a first and a second transceiver respectively disposed at a first and a second location of the input device for obtaining a plurality of spatial information of the input device. An expansion of the telescopic sensing component reflects the force of the input device applied to the screen, and the length of the input device is adjusted according to the force. The signal transceiver module transmits the expansion and the spatial information to the graphic system to allow the graphic system to generate a virtual object in the 3D model for simulating the state of the input device merging into the screen.