[其它] Compression and Direct Manipulation of Complex Blendshape Models

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发表于 2011-12-28 10:52:21 |只看该作者 |倒序浏览

Compression and Direct Manipulation of Complex Blendshape Models

Jaewoo Seo Geoffrey Irvingy J. P. Lewisz Junyong Nohx

KAIST Weta Digital Weta Digital KAIST

Abstract

We present a method to compress complex blendshape models and

thereby enable interactive, hardware-accelerated animation of these

models. Facial blendshape models in production are typically large

in terms of both the resolution of the model and the number of tar-

get shapes. They are represented by a single huge blendshape ma-

trix, whose size presents a storage burden and prevents real-time

processing. To address this problem, we present a new matrix com-

pression scheme based on a hierarchically semi-separable (HSS)

representation with matrix block reordering. The compressed data

are also suitable for parallel processing. An efﬁcient GPU imple-

mentation provides very fast feedback of the resulting animation.

Compared with the original data, our technique leads to a huge im-

provement in both storage and processing efﬁciency without incur-

ring any visual artifacts. As an application, we introduce an ex-

tended version of the direct manipulation method to control a large

number of facial blendshapes efﬁciently and intuitively.

CR Categories: I.3.7 [Computer Graphics]: Three-Dimensional

Graphics and Realism—Animation;

Keywords: blendshape, compression, direct manipulation

1 Introduction

Blendshapes are a predominant technique for the creation of real-

istic and semi-realistic facial animation. The strength of the blend-

shape method lies in its simple and interpretable parameterization:

the artist deﬁnes an ‘expression space’ with shapes such as raise-

inner-brow-right, and then models each shape exactly as desired.

Blendshape deformers are available in most commercial graphics

packages such as Autodesk maya and 3ds max, and virtual charac-

ters created with this technique abound in recent popular ﬁlms.

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