FreeCAD

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# FreeCAD TemplatePyMod module
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# (c) 2010 Werner Mayer LGPL
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import Mesh,Part,MeshPart
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faces = []
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mesh = App.ActiveDocument.ActiveObject.Mesh
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segments = mesh.getPlanarSegments(0.00001) # use rather strict tolerance here
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for i in segments:
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   if len(i) > 0:
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      # a segment can have inner holes
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      wires = MeshPart.wireFromSegment(mesh, i)
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      # we assume that the exterior boundary is that one with the biggest bounding box
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      if len(wires) > 0:
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         ext=None
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         max_length=0
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         for i in wires:
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            if i.BoundBox.DiagonalLength > max_length:
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               max_length = i.BoundBox.DiagonalLength
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               ext = i
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         wires.remove(ext)
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         # all interior wires mark a hole and must reverse their orientation, otherwise Part.Face fails
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         for i in wires:
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            i.reverse()
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         # make sure that the exterior wires comes as first in the list
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         wires.insert(0, ext)
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         faces.append(Part.Face(wires))
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shell=Part.Compound(faces)
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Part.show(shell)
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#solid = Part.Solid(Part.Shell(faces))
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#Part.show(solid)
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