Low-frequency Precomputed Radiance Transfer for Animation Models with Compressed Coefficients
Date Issued
2007
Date
2007
Author(s)
Yeh, Kuan-Lin
DOI
en-US
Abstract
Precomputed radiance transfer (PRT) is a technique to bring global illumination into real-time applications. The method precomputes the complicated transport of light represented by a transfer function and exploits the linearity of light transport to reduce the light integral to a simple linear algebra operation.
For a deformable model composed with a sequence of meshes, data from precomputation occupy plenty of storage. Based on the assumption that the transfer function is linear to the animation parameters, we represent a method to infer the linearity with a set of reference poses as its input. At run-time, each coefficient of transfer functions are approximated with dot product between the current animation parameters and per-vertex coefficients. The method introduces little computational overhead and saves storage by storing
only one set of coefficients at each vertex regardless the length of an animation.
Our main contribution is to propose a simple algorithm which can be easily implemented on GPU to approximate transfer functions. We analysis the method by comparing error rates and storage to CPCA, which used to be a compression strategy of PRT in a static scene. Since transfer functions of a
given animation are approximated at run-time, theres is no costly precomputation on transfer functions required.
Subjects
事前輻射轉移計算
壓縮
動畫模型
重新打光
全域照明
precomputed radiance transfer
compression
global illuminaition
relighting
animated models
Type
thesis
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