As the transmission of 3D shape models through Internet becomes more important, the compression issue of shape models gets more critical. The issues for normal vectors have not yet been explored as much as it deserves, even though the size of the data for normal vectors can be significantly larger than its counterparts of topology and geometry. Presented in this paper is an approach to compress the normal vectors of a shape model represented in a mesh using the concept of clustering. It turns out that the proposed approach has a significant compression ratio without a serious sacrifice of the visual quality of the model.

Abstract 
1. Introduction 
2. Related Works 
3. Representations of normal vectors in VRML model 
4. Clustering of the normal vectors 
5. Normal Vector Compression 
6. Experiment 
7. Conclusion 
Acknowledgements 
Reference

• Deok-Soo Kim
• Youngsong Cho
• Dongsoo Cho
• Hyun Kim