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have you checked your delete non-deformer history settings?
make sure its set to All non-deformer history.
ive had a quick play, and there nothing i can see to specifically delete selected history, but theres a few ways to tackle this.
best way might be to delete connections from the skin-node to the mesh, and make sure all the non-deformer nodes are connected to the mesh, delete the history then reconnect the skin node.
you could set up a duplicate object mesh, connect the projection etc (all the stuff you want to delete) from original mesh to duplicate, delete the history on that then connect the skin-node etc to the duplicate?
another way would be to export the skin-weights, delete all history (if the non-deformer history still doesn’t work) then reskin the joints and import the skin-weights.
if you abit script savvy, you should also be able to have a look into what maya does when it deletes the history.
hope that helps.
Lee Dunham | Character TD
ldunham.blogspot.com
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