Linear Blend Skinning

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# Linear Blend Skinning - PowerPoint PPT Presentation

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

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Presentation Transcript

### 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)
• 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.