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Linear Blend Skinning

Linear Blend Skinning. 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)

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Linear Blend Skinning

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  1. Linear Blend Skinning

  2. Same technique – different names • Linear blend skinning • Skeleton Subspace Deformation (SSD) • Smooth skinning (in Maya)

  3. 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

  4. 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)

  5. 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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