Input Regions (2) 

SmoothMeshNormals works equally well with MeshRegion, BoundaryMeshRegion and other linear regions:

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SmoothMeshNormals works with open and closed regions:

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Criteria (3) 

Specify the dihedral angle threshold used to classify edges as hard:

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A negative angle threshold will classify all edges as hard:

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An angle threshold of Infinity will classify all edges as soft:

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Specify the indices of the hard edges explicitly:

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Use All to classify all edges as hard:

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Use None to classify all edges as soft:

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Specify the face smoothing groups explicitly:

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Visualize the specified smoothing groups:

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Excluded face indices are considered to be in their own isolated smoothing group:

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Forms (5) 

Use "Graphics" to get a graphics object with the partially smoothed surface:

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Use "SmoothingGroupGraphics" to visualize the separate face smoothing groups with arbitrary colors:

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Use "GraphicsComplex" to get the GraphicsComplex that represents the partially smoothed surface:

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Apply custom styling:

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Use "SmoothFaceGraph" to get a Graph of adjacent faces connected by a soft edge:

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The connected components of this graph represent the separate face smoothing groups:

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These components can be returned directly using "SmoothFaceGroups":

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Use a list of multiple forms to avoid repeated computation:

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