Here's an example of how Quad Remesher works in Blender. This would really be the only way I'd consider doing automated retopo for any animated objects. Zbrush also has a fantastic automatic retopo solution called Zremesher, which works similar to Quad Remesher. So if you have access to Zbrush, that could be an alternative solution. I really feel both of those solutions are better than Instant Meshes.

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