The present invention relates to a system (200) for rendering a three-dimensional object, comprising an input device (202, 302), a processor (204, 306), and a picture reproduction device (206, 308). The input device (202, 302) comprises an image sensor (303) for capturing images of a first hand of a user, and is arranged to communicate the image to the processor (204, 306). The processor (204, 306) is arranged to process the images to determine movements of at least a part of the first hand for generating a control signal. The picture reproduction device (206, 308) is arranged to display 3D data of the three-dimensional object according to the control signal. While capturing images of the first hand of the user, the input device (202, 302) is adapted to be held in a second hand of the user during operation. A method complying with the features of the system (200) is also disclosed.