This dissertation, "VR Interfaces for Conceptual Design Using Geometric Modeling Techniques" by Jianming, Zheng, 鄭建明, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124139 Subjects: Geometrical models Virtual reality Human-computer interation Computer-aided design