topic Re: How the fusion 360 API gets the bounding box of the parameter space in Fusion API and Scripts Forum

How the fusion 360 API gets the bounding box of the parameter space

2544173825 — Fri, 18 Nov 2022 02:15:46 GMT

I want to use the Fusion 360 API to get a parameter space bounding box, UV bounding, for a face, but I didn't find the relevant method.

Re: How the fusion 360 API gets the bounding box of the parameter space

kandennti — Fri, 18 Nov 2022 04:55:49 GMT

Hi @2544173825 .

It can be obtained with the SurfaceEvaluator object.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-GUID-31dad9b2-ee1d-4216-8100-09ea44f9967a

We have created a script that displays the parameter range of the selected surface.

# Fusion360API Python script import traceback import adsk.fusion import adsk.core def run(context): ui = adsk.core.UserInterface.cast(None) try: app: adsk.core.Application = adsk.core.Application.get() ui = app.userInterface msg: str = 'Select' selFilter: str = 'Faces' sel: adsk.core.Selection = selectEnt(msg, selFilter) if not sel: return selectFace: adsk.fusion.BRepFace = sel.entity eva: adsk.core.SurfaceEvaluator = selectFace.evaluator bBox: adsk.core.BoundingBox2D = eva.parametricRange() _, pointMin = eva.getPointAtParameter(bBox.minPoint) _, pointMax = eva.getPointAtParameter(bBox.maxPoint) msglst = ['-- Parameter --'] msglst.append(f'min:{bBox.minPoint.asArray()}') msglst.append(f'min:{bBox.maxPoint.asArray()}') msglst.append('-- Position --') msglst.append(f'min:{pointMin.asArray()}') msglst.append(f'min:{pointMax.asArray()}') ui.messageBox('\n'.join(msglst)) except: if ui: ui.messageBox('Failed:\n{}'.format(traceback.format_exc())) def selectEnt( msg: str, filterStr: str) -> adsk.core.Selection: try: app: adsk.core.Application = adsk.core.Application.get() ui: adsk.core.UserInterface = app.userInterface sel = ui.selectEntity(msg, filterStr) return sel except: return None

Note that "face.evaluator" and "face.geometry.evaluator" give different results.

Re: How the fusion 360 API gets the bounding box of the parameter space

2544173825 — Fri, 18 Nov 2022 06:35:25 GMT

Thanks for your prompt reply！
This method looks very nice, but I don't quite understand statements like msg: str = 'select' which doesn't seem to be very common in python, he seems to be declaring a string type variable, but isn't the variable declaration in python possible to use msg = 'select' directly? Are the two equivalent? Also, is there any difference between select here and the entity I get via body.faces(edges)?

Re: How the fusion 360 API gets the bounding box of the parameter space

kandennti — Fri, 18 Nov 2022 07:32:45 GMT

@2544173825 .

As for ": str", it is a python type hints.
It has no effect on execution.

If you get it with body.faces(edges), elements in the root component are fine, but for elements in the occurrence (GUI component), you will have a problem.

You need to consider about proxies here.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-88A4DB43-CFDD-4CFF-B124-7EE67915A07A

Re: How the fusion 360 API gets the bounding box of the parameter space

2544173825 — Sat, 19 Nov 2022 06:51:02 GMT

I found a bug with parametricRange. When I debug a program, the first time I get a 2D bounding box through this method, it seems to be fine, but when I break the debug and start it again, there are some problems with the 2D wraparound box I get. This is reflected in the returned maxpoint, which may appear as maxpoint=minpoint, or maxpoint.y=minpoint.y. When I restart VScode and Fusion 360, it returns to normal.

for face in tem_body.faces: face_id = face.tempId face_type = face.geometry.objectType face_normal = face.geometry.normal face_reversed = face.isParamReversed face_are = face.area centroid_point = face.centroid point_on_face = face.pointOnFace uvgrid(face=face, method='point') def uvgrid(face, num_u = 10, num_v = 10, method=None, reverse = True): assert num_u >= 2 assert num_v >= 2 eval = face.evaluator face_para_bounding = eval.parametricRange() point_max = face_para_bounding.maxPoint point_min = face_para_bounding.minPoint

Re: How the fusion 360 API gets the bounding box of the parameter space

kandennti — Sat, 19 Nov 2022 08:09:03 GMT

@2544173825 .

I have not tried many, but I have no such experience.
Is there an f3d file that can be attached?

Re: How the fusion 360 API gets the bounding box of the parameter space

2544173825 — Sat, 19 Nov 2022 12:10:08 GMT

I have not .f3d file. I get part information from .smt file, but, I cannot upload .smt file. I had upload .step file.

Re: How the fusion 360 API gets the bounding box of the parameter space

kandennti — Sat, 19 Nov 2022 13:58:41 GMT

@2544173825 .

Thanks for the data. smt file can be attached to the forum if you zip it.

I have seen the data. Perhaps the two sides here will be the problem.

I think it is due to the fact that they are periodic.

The periodicity can be checked by using the getParamAnomaly method.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-d6b7d30a-972b-4117-9292-c0a87be8ba62

I have checked and U is periodic.

Re: How the fusion 360 API gets the bounding box of the parameter space

2544173825 — Mon, 21 Nov 2022 01:51:12 GMT

Thanks