The current paper presents a system for the dynamic simulation of the human hand. The simulation of the human hand offers the capability to acquire handshapes that correspond to letters of the finger alphabet, enabling an integrated representation of words and sentences. The hand model is designed using the Autodesk Inventor TM and Autodesk AutoCad TM design environments. The user is able to type words or sentences which are dynamically translated into postures according to the finger alphabet. The system is based on the physiometric characteristics of an average human hand. High precision design is utilized in every part through integration of all the necessary functionalities needed to perform the movements required. The system has been tested on more than 500 words with a letter representation success rate in the range of 95-97%.

Intuitive interactive methods for novice users to create 3D content and 3D geometry have eluded the CAGD community for several decades, and they continue to be critical yet unresolved challenges. The need for such methods is even more acute considering the fact that 3D printing is becoming a commodity. In contrast, modern geometric modeling tools are very complex and continue to be used primarily by professionals such as architects and engineers.Part of the difficulty of novice users to create 3D content might be found in the fact that input/output devices are mostly 2D. While novice users, in real life, do interact daily in 3D environments, typically, they do not create 3D content. In this work, we combine a Leap Motion device [42] / mouse+keyboard with the intuitive notion of sand art, or the creation of 3D artifacts on the seashore, using droplets of wet sand. The result is a very simple, yet highly interactive 3D modeling interface that is also demonstrated on several applications.