topic Re: How can create a patch by a loop in Fusion API and Scripts Forum

How can create a patch by a loop

ho-kou — Fri, 25 Feb 2022 02:31:09 GMT

Hi everybody,
I want to create a patch using the loop inside Fig.1 and Fig.2 according to the following flow.
①Gets all loops for each face of the target body.
②If the loop obtained in ① has an internal shape, use this loop to create a sketch.
③Create a patch using the sketch profile created in ②.
Issue: Depending on the shape of the internal loop, the sketch profile for patch creation may not be generated.
For example, [sample_a.step] is NG. [Sample_b.step] is OK.
Can you tell me how to create a patch even with the shape of [sample_a.step]?

# Assuming you have not changed the general structure of the template no modification is needed in this file. from . import commands from .lib import fusion360utils as futil import adsk.core, adsk.fusion, adsk.cam, traceback _app = None _ui = None _design = None _rootComp = None def run(context): try: # This will run the start function in each of your commands as defined in commands/__init__.py commands.start() # fusion情報を取得 global _app, _ui _app = adsk.core.Application.get() _ui = _app.userInterface product = _app.activeProduct global _design _design = adsk.fusion.Design.cast(product) global _rootComp _rootComp = _design.rootComponent allBodies = _rootComp.bRepBodies bodycount = allBodies.count if allBodies.count < 1: _ui.messageBox('Body count is not exist') return newbody = allBodies.item(0) # create patch oresult = [-1] CreatePatch(newbody, oresult) return except: futil.handle_error('run') # create patch def CreatePatch(targetbody, oresult): try: oresult[0] = -1 i = 0 j = 0 for face in targetbody.faces: for Loop in face.loops: if Loop.isOuter: # if Loop is Outer continue # create sketch by inter loop brepEdges = Loop.edges skt = createsketch(brepEdges) # can not get sketch's profile profilecurve = skt.profiles[0] # Create the patch feature by sketch's profile patches = _rootComp.features.patchFeatures patchInput = patches.createInput(profilecurve, adsk.fusion.FeatureOperations.NewBodyFeatureOperation) patches.add(patchInput) oresult[0] = 0 except: _ui.messageBox('Failed:\n{}'.format(traceback.format_exc())) # crate loop's sketch def createsketch(brepEdges): try: oresult = -1 skt :adsk.fusion.Sketch = _rootComp.sketches.add(_rootComp.xYConstructionPlane) skt.arePointsShown = False edge = brepEdges.item(0) edgegeo :adsk.core.NurbsCurve3D = None curveType = edge.geometry.curveType sktFits = None if curveType == 2: # Circle3DCurveType sktFits :adsk.fusion.SketchFixedSplines = skt.sketchCurves.sketchFixedSplines else: # NurbsCurve3DCurveType sktFits :adsk.fusion.SketchFittedSplines = skt.sketchCurves.sketchFittedSplines for edge in brepEdges: if curveType == 2: # Circle3DCurveType edgegeo = edge.geometry.asNurbsCurve sktFits.addByNurbsCurve(edgegeo) else: # NurbsCurve3DCurveType edgegeo = edge.geometry eva :adsk.core.SurfaceEvaluator = edgegeo.evaluator _, sPnt, ePnt = eva.getEndPoints() _, [sPrm, ePrm] = eva.getParametersAtPoints([sPnt, ePnt]) # get Transit point _, pnts = eva.getStrokes(sPrm, ePrm, 0.01) pntLst = adsk.core.ObjectCollection.create() [pntLst.add(p) for p in pnts] sktFits.add(pntLst) skt.name = 'test' return skt except: _ui.messageBox('Failed:\n{}'.format(traceback.format_exc())) def stop(context): try: # Remove all of the event handlers your app has created futil.clear_handlers() # This will run the start function in each of your commands as defined in commands/__init__.py commands.stop() except: futil.handle_error('stop')

Re: How can create a patch by a loop

tykapl.breuil — Fri, 25 Feb 2022 08:33:46 GMT

The problem you encounter is that a SketchProfile is, in my understanding, planar. You logically encounter a problem when trying to make a profile from a non planar edge. However, according to the documentation, a PatchFeature can take BRepGeometry, thus we should be able to forego using a sketch all together. I've tried to throw in a sample code, tell me if it works out for you.

# create patch def CreatePatch(targetbody, oresult): try: oresult[0] = -1 i = 0 j = 0 for face in targetbody.faces: for Loop in face.loops: Loop: adsk.fusion.BRepLoop if Loop.isOuter: # if Loop is Outer continue # create sketch by inter loop brepEdges = Loop.edges pathEdgeCollection = adsk.core.ObjectCollection.create() [pathEdgeCollection.add(edge) for edge in brepEdges] path = adsk.fusion.Path.create(pathEdgeCollection, 0) # Create the patch feature by sketch's profile global _rootComp patches = _rootComp.features.patchFeatures patchInput = patches.createInput( path, adsk.fusion.FeatureOperations.NewBodyFeatureOperation ) patches.add(patchInput) oresult[0] = 0 except: _ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

For the first sample, which gave you trouble, the script produced this :

Re: How can create a patch by a loop

MichaelT_123 — Fri, 25 Feb 2022 08:52:07 GMT

Hi Mr. Ho-Kou,

Consider ... instead of creating sketch with profile to be used as a patch, split a face of target body with the surface body tool, and use the resulting cut-off face as a patch(s). Contrary to sketch profiles they don't need to be flat.

Look at the attached file. I believe that converting this idea to respective script would be ... a piece of cake 👩‍🍳 .

Regards

MichaelT

Re: How can create a patch by a loop

ho-kou — Fri, 25 Feb 2022 09:40:15 GMT

hi,Paul Breuil

Use your code, i am succeed to create the patch,

thank you very much.

Re: How can create a patch by a loop

ho-kou — Fri, 25 Feb 2022 09:42:18 GMT

hi Michael Tomsia

thanks for your solution.

I try to do it.