Draft OCA

    From FreeCAD Documentation


    Draft OCA is a software module used by the Std Open.svg Std Open, Std Import.svg Std Import and Std Export.svg Std Export commands to handle the OCA file format.

    The OCA file format is a 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 can be imported:

    • Lines
    • Arcs and Circles
    • Closed areas


    The following FreeCAD objects can be exported:

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


    See Import Export Preferences.


    See also: Autogenerated API documentation and FreeCAD Scripting Basics.

    To export objects to OCA use the export method of the importOCA module.

    importOCA.export(exportList, filename)
    • For the Windows OS: use a / (forward slash) as the path separator in filename.


    import FreeCAD as App
    import Draft
    import importOCA
    doc = App.newDocument()
    polygon1 = Draft.make_polygon(3, radius=500)
    polygon2 = Draft.make_polygon(5, radius=1500)
    objects = [polygon1, polygon2]
    importOCA.export(objects, "/home/user/Pictures/myfile.oca")