The ‘labels and attributes’ on the left-hand side of the screen show there is only one defined object, named ‘plate’ if you click on that you can modify its placement (i.e. Lines 15 & 16 set a perspective view, and adjust the zoom level so the part fits in the display space. Line 14 adds the resulting object to the current document without this step, the object won’t be visible. The plate is then cut with the cylinder, creating a hole 20 units in diameter. Lines 12 & 13 create a cylinder with 10 units radius and 2 units high, offset from the origin using a ‘Vector’ object, which defines a position in 3-dimensional (x,y,z) space. The makeFillet method requires a list of edges, and we only want to modify the vertical edges, so the list of edges is filtered by checking the z-dimension length is non-zero. Lines 10 & 11 create the rounded corners (‘fillets’ in FreeCAD terminology), with a radius of 5 units. Line 9 creates a square plate, size 50 x 30 units, and 2 units thick. As a safeguard, if you currently have a named document open, the script will error out This means that every time you run the script you get a new clean document to display the result. Lines 6-8 remove a previous unnamed document, and create a new one.
Freecad python scripting examples code#
However the code is more than a single line, so some explanations are in order: The result is a plate with rounded corners, and a large off-centre hole: Verticals = Ĭyl = Part.makeCylinder(10, 2, Vector(20, 15, 0))ĭoc.addObject("Part::Feature", "plate").Shape = plateįreeCADGui.activeDocument().activeView().viewAxonometric()įreeCADGui.SendMsgToActiveView("ViewFit") # Simple test of FreeCAD Part scripting, from iosoft.blog Simple 3D objects (cube, cylinder etc.) can be created with a single line of code: Like many 3D CAD packages, FreeCAD uses the Constructive Solid Geometry (CSG) method, where the final design is built up by adding (fusing) elements together, and subtracting (cutting) one element from another.
exec(open("/Projects/FreeCAD/test.py").read()) You can directly execute a file by entering a command at the Python console, e.g. Executing a file from the FreeCAD Python console
Unfortunately, there are some subtle differences when executing a file in this manner, as opposed to the other methods, see my usage of the recompute() function in the later code examples. When complete, the file can be run by pressing ctrl-F6.
You are then presented with a nice-looking editor window, into which you can paste one of the examples from this blog. You can load a Python script into FreeCAD using the normal GUI File Open. Hence, if you are experiencing problems with previously-good code that suddenly doesn’t work, it is worth restarting FreeCAD in case this fixes the problem. If FreeCAD encounters a problem with your script, it will generally give a sensible error message, however very occasionally a script can corrupt the internals of the program, so it fails to respond in the usual manner. If you make that change, it is necessary to exit & re-enter FreeCAD for the change to take effect. They are stored in the default location for scripts you can alter this to a directory of your choosing, by changing the ‘user macros location’ in the dialog box. Executing as a MacroĬlick on Macro then Macros… and you are given a list of Python macro files that can be executed.
Freecad python scripting examples full#
If you want to see the box in its full 3-D glory, either use the GUI controls to change the viewpoint, or add the following 2 lines: FreeCADGui.activeDocument().activeView().viewAxonometric()įreeCADGui.SendMsgToActiveView("ViewFit") 2. The result is a bit underwhelming all you can see is the bottom left-hand corner of a square. In the FreeCAD Python console window, try entering: FreeCAD.newDocument("Unnamed") There are several ways of running a Python script in FreeCAD: 1. The examples here have been tested with FreeCAD v0.16, and the current version 0.18 Running Python code This is very much a work-in-progress, but hopefully will provide some useful pointers if you’re a Python programmer doing occasional 3D design. This is simple in theory, but a bit tricky in practice I’ll spare you the many frustrating false-starts I’ve made, and describe some simple ways of producing 3D objects from scratch in Python. Most packages support some form of scripting, so why not program my complete design from scratch, without touching the GUI? FreeCAD is a (free) 3D design package, with a comprehensive Python interface, so seems to be ideal… 3D CAD packages can be hard work there is a lot to learn, which can be a major problem for an infrequent user such as myself.
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