Please use this identifier to cite or link to this item: http://dspace.cityu.edu.hk/handle/2031/4802
Title: 3D rendering using a hemishperical basis
Authors: Hui, Kai Hei
Department: Department of Electronic Engineering
Issue Date: 2007
Supervisor: Supervisor: Dr. Leung, Andrew C S. Assessor: Dr. Fong, Anthony S S
Abstract: Illuminating 3-Dimension objects under a distant environment is a very time-consuming process. Using spherical harmonic (SH) to represent the reflectance property is a technique for reducing the huge number of shading calculations. A study on using the SH basis to represent the reflectance, including the visibility, of surface elements and the lighting environment was carried out. Based on the visual C++ 6.0 platform (OpenGL language) and Cg platform, a hardware shading engine for diffuse surfaces with visibility has been built. In my study, the number of SH coefficients for rendering is varied. The visual result shows that using 25-49 SH coefficients can only simulate a very rough shadow effect. Using 81 SH coefficients can obtain an acceptable shadow effect. Finally, several factors that affect the rendering quality were discussed.
Appears in Collections:Electronic Engineering - Undergraduate Final Year Projects

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