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## PowerPoint Slideshow about ' Linear Blend Skinning' - sydnee-moses

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Same technique – different names

- Linear blend skinning
- Skeleton Subspace Deformation (SSD)
- Smooth skinning (in Maya)

How it works?

- Static character model (skeleton with joints) in neutral pose (dress pose)
- Each vertex assigned a set of influences with blending weight
- Rigidly transform each neutral pose vertex (by all of its influencing joints)
- Blending weights are used to combine these transformed positions

Problems

- It cannot represent complex deformations and suffers from characteristic artifacts (candy-wrapper, collapse effect on wrists and around bending joints)
- Why?
Vertices are transformed by linearly interpolated matrices (collapses near 180 degrees)

Solutions

- Avoiding such a dissimilar blending transformations (extra transformations that properly interpolates without collapsing
- I.e. twisting wrists - extra joint that interpolates the rotation angle correctly
- Could be used also for muscles, wrinkles and etc.
- The key: since vertices choose weighted sums of transformations, if any linear scaling of an added joint is beneficial it may be used.

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