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Virtual Reality: Concepts and Technologies
book

Virtual Reality: Concepts and Technologies

by Philippe Fuchs, Guillaume Moreau, Pascal Guitton
July 2011
Beginner content levelBeginner
432 pages
16h 6m
English
CRC Press
Content preview from Virtual Reality: Concepts and Technologies
Models for visual rendering 349
compress this data. This step should maintain the characteristics of the BTF as much
as possible and offer a quick decompression.
A large number of compression methods consider a BTF as a collection of discrete
textures or an “apparent BRDF varying spatially’’ (ABRDF Wong et al., 1997). Note
that in this approach, the ABRDF are not physically plausible as non reciprocal, since
they consider the scattering of other parts of the surface.
The most natural compression is to approach the BTF in each pixel by a BRDF
model.
BTF(x, ρ
r
, ρ
i
) f
r,x
(ω
i
ω
r
) (15.2)
The BRDF models f
r
(ω
i
ω
r
) must be, however, quick enough in assessment ...
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Publisher Resources

ISBN: 9780203802953