d3dx_skinnedmesh.pdf
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2012-03-23
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Skinned Mesh Character Animation
with Direct3D 9.0c
Frank Luna
www.moon-labs.com
Copyright © 2004. All rights reserved.
Created on Monday, February 20, 2004
Update 1 on Friday, September 10, 2004
Real-Time character animation plays an important role in a wide variety of 3D
simulation programs, and particularly in 3D computer games. This paper describes the
data structures and algorithms used to drive a modern real-time character animation
system. In addition, it presents a thorough examination of the D3DX 9.0c Animation
API.
Section 1 describes the motion and data structural representation of a 3D
character. Section 2 focuses on the datasets needed to describe an animation sequence.
Section 3 examines an animation technique that works with rigid bodies and emphasizes
the problems associated with this approach. Section 4 explains a new animation
technique, vertex blending (also called skinned mesh animation), which does not suffer
the problems of rigid body animation. Section 5 shows how to implement a skinned
mesh character animation using the D3DX Animation API. Section 6 demonstrates how
to play multiple distinct animation sequences. Section 7 explores how to create new
animations from existing ones using the D3DX animation blending functionality. And
finally, Section 8 explains how to execute code in parallel with an animation sequence,
using the D3DX animation callback functionality.
1 An Overview of Character Mesh Hierarchies
Figure 1 shows a character mesh. The highlighted chain of bones in the figure is
called a skeleton. A skeleton provides a natural underlying structure for driving a
character animation system. The skeleton is surrounded by an exterior skin, which we
model as 3D geometry (vertices and polygons). Each bone in the skeleton influences the
shape and position of the skin, just like in real life; mathematically, bones are described
by transformation matrices which transform the skin geometry appropriately. Thus, as
we animate the skeleton, the attached skin is animated accordingly to reflect the current
pose of the skeleton.
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wqazwqaz2013-06-23文档的原理讲述很清楚，有公式有图
