Manipulating Shape and Material of Bidirectional Texture Functions
Date Issued
2005
Date
2005
Author(s)
Chao, Sung-Hsiang
DOI
en-US
Abstract
Currently, realistic rendering of complex materials in real-time is still a big challenge. Many graphics researchers have devoted to study representations of real-world materials for better rendering quality. The most critical issue is that: it is hard to separate the intermixed shading of complex materials, which is generated by surface meso-structure and reflectance. In this thesis, a method is presented to manipulate shape and reflectance of bidirectional texture functions (BTFs), which is a general representation of complex materials. We first separate a BTF into shape (surface meso-structure, or a normal map in practice) and reflectance (bidirectional reflectance distribution functions, BRDFs). Furthermore, we can manipulate the shape and reflectance to create new synthesized materials.
Two phases are employed to achieve our objective. First, assuming that the reflectance of every pixel in a BTF behaves independently, we recover the per-pixel normal and BRDF parameters based on photometric stereo. Afterwards, we provide a friendly user interface and several operations to manipulate the recovered shape and reflectance to produce numerous plausible materials. In consideration of cost of the acquisition a real BTF, our work provides an alternative method for generation of complex material.
Subjects
雙向材質函式
貼圖
繪製
BTF
Texture
Rendering
Type
thesis
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