Modeling View-Dependent Surface Point Radiance with Parameter Maps
Student thesis: Master Thesis and HD Thesis
- Bjarne Mortensen
- Jens Andersen
4. term, Vision, Graphics and Interactive Systems, Master (Master Programme)
In this thesis, it is investigated how real world surfaces can be sampled, modeled and reconstructed in computer graphics applications where properties like view-dependent appearance and subtle geometric details are preserved.
A dense grid of sampling points on the surface are photographed from multiple view directions using high dynamic range imaging. The recorded radiances from each surface point are saved.
Models are fitted to the obtained data in order to achieve a unique and compact parametric representation of the radiance distribution on a per-point basis. Two models are employed: a modified Phong reflection model and spherical harmonics. The feasibility of these models are investigated in tests.
Custom vertex and fragment shader programs are implemented in OpenGL to be able to reconstruct the complex surface using simple geometry. The parameters and shader programs to the corresponding model are loaded onto the graphics card and used to recreate the view-dependent appearance of the surface in an interactive real time application.
Tests show strengths and weaknesses of both models and experience is gained regarding how the sampling should be performed for optimal results.
Language | English |
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Publication date | 2007 |
Number of pages | 149 |
Publishing institution | CVMT |