Macro Extract Wires from Mesh

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Macro Extract Wires from Mesh.png Macro Extract Wires from Mesh

Description
Finds boundary wires in selected mesh objects. Boundary wires are formed from all the edges found in the mesh that are shared by only one face, that is, they are "border" edges. The found wires get added to the document (one compound per mesh object), while the mesh itself gets hidden.

Macro version : 1
Date last modification : 2016-12-17
FreeCAD version : All
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Author
Yorik
Download
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Links
Macro Version
1
Date last modification
2016-12-17
FreeCAD Version(s)
All
Default shortcut
None
See also
None


Description

Finds boundary wires in selected mesh objects. Boundary wires are formed from all the edges found in the mesh that are shared by only one face, that is, they are "border" edges. The found wires get added to the document (one compound per mesh object), while the mesh itself gets hidden.

Script

ToolBar Icon Macro Extract Wires from Mesh.png

Macro_Extract_Wires_from_Mesh.FCMacro

#!/usr/bin/python

# This macro will extract wires from selected meshes
# The result is a new Part Compound containing wires, one per original mesh object
# The selected meshes will be hidden but still selected after the operation.
# Warning, it takes a bit of time...

import FreeCAD,FreeCADGui,Part,Draft,DraftGeomUtils,Mesh
for obj in FreeCADGui.Selection.getSelection():
    if obj.isDerivedFrom("Mesh::Feature"):
        shape = Part.Shape()
        shape.makeShapeFromMesh(obj.Mesh.Topology,0.1)
        edges = []
        lut = {}
        for f in shape.Faces:
            for e in f.Edges:
                lut.setdefault(e.hashCode(),[]).append(e)
        for k,v in lut.items():
            if len(v) == 1:
                edges.extend(v)
        if edges:
            wires = DraftGeomUtils.findWires(edges)
            if wires:
                Part.show(Part.makeCompound(wires))
                obj.ViewObject.hide()