When a mesh is smoothed, every selected vertex is moved towards the average position of its neighbors. Is there a way to do the opposite, given a mesh with bumps, curves and corners, to move selected vertices by small amounts opposite of what mesh smoothing would do?
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Can Blender "un-smooth" a mesh?
An alternative method to reverse an operation is to add 2 shape keys, enter editmode with with a non-basis shape, edit the mesh (smooth it for example), exit editmode, then slide the shape key to a negative value you can then optionally apply it to the base mesh.
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