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Placer Shape and Ctrl Shape
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You can adjust a size by using the above attribute.
You need to adjust both, and then you will get the above shapes when you convert to animation Rig
Wrist placer
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This page will help you below cases,
You have already snapped finger places ( forget to move the diamond object<root of hand placer> )
orYou don’t like your wrist position and you would move wrist position of arms.
You would end up that wrist connection should move and all finger placers as well