Difference between revisions of "Draft OCA"

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Revision as of 20:31, 21 February 2020

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Draft OCA

Menu location
File → Export → Open CAD format (*.oca)
Default shortcut
Introduced in version
See also
Draft SVG, Draft DXF


This function imports OCA/GCAD files. The OCA file format is community effort to create a free, simple and open CAD file format.

OCA is largely based on the GCAD file format generated from gCAD3D. Both formats can be imported in FreeCAD, and the OCA files exported by FreeCAD can be opened in gCAD3D.


The following OCA objects get imported at the moment:

  • Lines
  • Arcs and Circles
  • Closed areas


Works the same way as opening but places the objects in the active document instead of creating a new one.


Objects that can be exported at the moment:

  • Lines and wires (polylines)
  • Arcs and circles
  • Faces


The following parameters can be specified in the Draft Preferences tab, Edit → Preferences → Draft:

  • Import closed areas or not


See also: Draft API and FreeCAD Scripting Basics.

You can export elements to OCA by using the following function:

importOCA.export(exportList, filename)


import FreeCAD, Draft, importOCA

p1 = FreeCAD.Vector(0, 0, 0)
p2 = FreeCAD.Vector(1000, 1000, 0)
p3 = FreeCAD.Vector(2200, 1500, 0)
p4 = FreeCAD.Vector(2500, -100, 0)

obj1 = Draft.makeWire([p1, p2, p3, p4])
obj2 = Draft.makeWire([p1, -2.3*p2, -0.8*p3, -1.8*p4])

objects = [obj1, obj2]

importOCA.export(objects, "/home/user/Pictures/myfile.oca")