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Blender 2.49 Scripting by Michel J. Anders

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Selecting ultra sharp faces

Many tools exist to select faces that are in some sense unwieldy to work with. Blender has built-in tools to select faces that have an area that is too small or that have a perimeter that is too short. However, it lacks a tool to select faces with edges that form angles that are sharper than some limit. In some modeling tasks it would be very convenient if we could select such faces, as they are generally difficult to manipulate and may give rise to ugly artifacts when applying a subsurface modifier or deforming a mesh.

Note

Note that Blender's select sharp edges tool (Ctrl + Alt + Shift + S) does something different despite its name; it selects those edges that are shared by exactly two faces whose angle of contact ...

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