topic Re: Remove loops from SketchFittedSpline in Fusion API and Scripts Forum

Remove loops from SketchFittedSpline

moritz.bischof1 — Wed, 23 Mar 2022 22:56:53 GMT

A script im working on generates points and draws a SketchFittedSpline through them. In the image above, you can see a part of the SketchFittedSpline, and the blue area it encloses. However, there is also this loop (which i circled in green) which i would like to get rid of.

I already tried a lot of approaches, like manually calculating intersections using the Bently-Ottmann algorithm, but that went nowhere.

I would highly appreciate some guidance where to start! I was hoping that some features of the API would make this somewhat easy so that I could avoid having to calculate everything manually.

Re: Remove loops from SketchFittedSpline

MichaelT_123 — Thu, 24 Mar 2022 00:35:18 GMT

Hi Mr Moritz.Bischof1,

Consider the following:

Identify a profile you want to 'preserve'
Iterate through the spline's fit points.
Check if a given fit point falls within profile or not (perhaps algorithm here does need the explanation)
Dependent upon the objective include in the calculation profile's edge or implement some tolerances
Mark the spline fittedPoints which fall outside the profile (or outside tolerance)
Draw a new spline including all fit points from the previous one, but marked

Regards

MichaelT

Re: Remove loops from SketchFittedSpline

moritz.bischof1 — Thu, 24 Mar 2022 02:09:12 GMT

Hey Michael,

thanks for the reply.

While you did not directly answer the question, you motivated me to dig a bit deeper in the API docs, and I found a solution which works.

1. create a temporary sketch

2. create my shape in the temporary sketch using lines

3. get the profile from the temporary sketch im interested in:

biggest = None for p in tmp_sketch.profiles: if biggest is None or p.areaProperties().area > biggest.areaProperties().area: biggest = p

4. copy all points from the profile

# copy points from profile into new list resulting_profile_curves = biggest.profileLoops.item(0).profileCurves new_point_list = adsk.core.ObjectCollection.create() for curve in resulting_profile_curves: line: Line3D = curve.geometry new_point_list.add(line.endPoint.copy())

5. create the final SketchFittedSpline in the "original" sketch

6. delete temporary sketch

Definetely got more familiar with the API trying to figure this out ^^