topic Re: Sizing problem when performing a coincident constraint in Fusion API and Scripts Forum

Sizing problem when performing a coincident constraint

vitor.carneiro — Tue, 08 Jun 2021 19:09:42 GMT

Hello,

I would like help with the following problem.
I want to include a spline inside a sketch that already contains a line, and make two constraints: the first with the first point of the line and the spline, and the second, between the end point of the line and the middle of the spline.
But I encounter the problem of a line dimension error after the constraints (decreasing its size).
Here's the code and photo of the error found.

Note 1: I really need to insert the spline in the sketch, as this is just a test for another application, where it is necessary to perform this operation.

Note 2: I need the line to remain the same 8 cm as it initially has.

Thank you very much,
Vitor Urel

Re: Sizing problem when performing a coincident constraint

kandennti — Wed, 09 Jun 2021 09:04:06 GMT

Hi @vitor.carneiro .

How about adding a DistanceDimension in advance?

# Fusion360API Python script import adsk.core, adsk.fusion, traceback def run(context): ui = adsk.core.UserInterface.cast(None) try: app :adsk.fusion.Application = adsk.core.Application.get() ui = app.userInterface des :adsk.fusion.Design = app.activeProduct root :adsk.fusion.Component = des.rootComponent sk = root.sketches.add(root.xYConstructionPlane) sk1 = root.sketches.add(root.xYConstructionPlane) points = adsk.core.ObjectCollection.create() pnts = [ [0,0,0], [5,1,0], [6,4,0], [7,6,0], [2,3,0], [0,1,0], ] Pnt3D = adsk.core.Point3D for p in pnts: points.add(Pnt3D.create(p[0],p[1],p[2])) spline = sk1.sketchCurves.sketchFittedSplines.add(points) spline1 = sk.include(spline) spline2 = spline1.item(0) line = sk.sketchCurves.sketchLines.addByTwoPoints( Pnt3D.create(0,0,0), Pnt3D.create(8,0,0) ) # DistanceDimension sk.sketchDimensions.addDistanceDimension( line.startSketchPoint, line.endSketchPoint, adsk.fusion.DimensionOrientations.AlignedDimensionOrientation, Pnt3D.create(4,1,0)) sk.geometricConstraints.addCoincident( line.startSketchPoint, spline2.startSketchPoint ) sk.geometricConstraints.addCoincident( line.endSketchPoint, spline2 ) except: if ui: ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

Re: Sizing problem when performing a coincident constraint

BrianEkins — Fri, 11 Jun 2021 02:57:54 GMT

If you want the line to remain exactly where it was before adding the coincident constraints, I think the best solution is to fix both endpoints of the line. You can do that with something like this:

line.startSketchPoint.isFixed = True line.endSketchPoint.isFixed = True