Create circle using 3 points via script

[fredrikcarlssonnlm]

Hey

We want to create a circle using 3 points in a 3 dimensional space using scrips in Fusion360.

I dont find any fucntion for this.

There is alot of functions to create circles but not to create a circle from 3 points.

Br

Fredrik

[kandennti]

Hi @fredrikcarlssonnlm -San.

Try using the addByThreePoints method.

# Fusion360API Python script

import traceback
import adsk.core as core
import adsk.fusion as fusion

def run(context):
    ui: core.UserInterface = None
    try:
        app: core.Application = core.Application.get()
        ui = app.userInterface
        des: fusion.Design = app.activeProduct
        root: fusion.Component = des.rootComponent

        skt: fusion.Sketch = root.sketches.add(
            root.xYConstructionPlane
        )
        skt.sketchCurves.sketchCircles.addByThreePoints(
            core.Point3D.create(1,0,0),
            core.Point3D.create(2,1,2),
            core.Point3D.create(0,1,-1),
        )

    except:
        if ui:
            ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

[fredrikcarlssonnlm]

Have you tried this function?

Seems to be coming directly from ChatGPT?

We do not get this to work currently and have already tries this sadly.

[kandennti]

@fredrikcarlssonnlm -San.

It is running fine in my environment.

Fusion360 Ver2.0.18719

ms_python v2023.20.0

[BrianEkins]

addByThreePoints is not a method imagined by ChatGPT. Here's the official Fusion documentation for it.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-bb94f635-2b1f-4ee2-ad64-dc2418a8584a

[fredrikcarlssonnlm]

Thanks!

I will try this directly!

[fredrikcarlssonnlm]

Does this work with 3 dimensional points?

All the points are on the same construction plane but they dont have the same x,y or z cordinate.

[kandennti]

@fredrikcarlssonnlm -San.

If there are three points in a straight line, you will probably get an error, but otherwise it is fine.

[BrianEkins]

It does work in 3D space. It uses the coordinate system of the sketch. All sketches are 3D; it's just that we usually only draw on their X-Y plane, but they support geometry that exists outside that plane. 

If your coordinates are with respect to model space, you can use the Sketch.modelToSketchSpace method to convert the model space coordinates into sketch space coordinates and then use themto create your circle.