This paper presents a visibility sphere marching algorithm of constructing polyhedral models from Dexel volume models in haptic virtual sculpting for virtual prototyping and manufacturing. This paper presents a top-down approach in analyzing the conversion problem. The proposed visibility sphere marching algorithm is composed of 3 sub-algorithms: roof and floor covering, wall-building and hole-filling algorithms. Dexel volume model is used as the in-process model representation during interactive modification in a virtual sculpting system. The stock material represented in Dexel volume model is sculpted into a designed model using a developed haptic sculpting system. The sculpted Dexel volume model can be converted to polyhedral surface model in STL format by the proposed visibility sphere marching algorithm. Polyhedral surface model can then be input to and processed by available CAM (Computer-aided Manufacturing) or RP (Rapid Prototyping) systems. The presented technique can be used in virtual sculpting, CAD/CAM, NC (numerically-controlled) machining verification, and rapid prototyping.

This content is only available via PDF.
You do not currently have access to this content.