topic Re: Multiple input to a splitBodyFeature ? in Fusion API and Scripts Forum

Multiple input to a splitBodyFeature ?

andreas.pedersen8EDUH — Mon, 21 Feb 2022 22:00:06 GMT

I am trying to split a model into sections of 1cm along one axis(lets say Y-axis)

The model is about 700cm high, so there will be 699 sections. I want to read out the volume of each of theese "slices". So if there is a way that doesnt involve splitting the body, I am all ears.

I can do it using the API, but the time it takes is extreme. (10 minutes)

Are there any better(read:faster) way than making an offset plane, using it as a splitting tool and splitting the body.?

I cant seem to find a way to get the split-feature to accept multiple inputs, i think that is part of the problem, because the timeline gets filled with plane-fetures and split-features. I have also tried to model a continuous line that covers the model in a back-and-forth kind of way, but no luck.

Any thoughts ?

Thanks.

Andreas

Re: Multiple input to a splitBodyFeature ?

kandennti — Tue, 22 Feb 2022 03:33:21 GMT

Hi @andreas.pedersen8EDUH .

Think of it as an idea.

I found the analyzeInterference method to be very fast when I tried it here before.

https://forums.autodesk.com/t5/fusion-360-api-and-scripts/find-any-interferance-with-active-objects-and-only-one-tool/m-p/10885516

You may want to try creating a box as the tools of the split in advance and check for interference.

Re: Multiple input to a splitBodyFeature ?

MichaelT_123 — Tue, 22 Feb 2022 11:18:08 GMT

Hi Mr. Andreas.Pedersen8EDUH,

Consider implementing the splitting process in the domain of TemporaryBRepManager.

It should run much faster. The F360 docs contain some examples of HOW TO DO IT.

Regards

MichaelT

Re: Multiple input to a splitBodyFeature ?

BrianEkins — Wed, 23 Feb 2022 05:57:03 GMT

I wrote this add-in a few years ago and it might be close to what you're looking for.

https://ekinssolutions.com/sliceitup/

Re: Multiple input to a splitBodyFeature ?

andreas.pedersen8EDUH — Wed, 23 Feb 2022 07:42:05 GMT

Thanks for your reply! I will look into this, but as I understand, it will still require 700 tool-boxes ?

-Andreas

Re: Multiple input to a splitBodyFeature ?

andreas.pedersen8EDUH — Wed, 23 Feb 2022 07:43:01 GMT

Thank you for your suggestion, I will look into this, as this may be what I need for reducing the time.

_Andreas

Re: Multiple input to a splitBodyFeature ?

andreas.pedersen8EDUH — Wed, 23 Feb 2022 07:44:04 GMT

Thank you for your contribution. Looks nice. If I cant fix my script, I will look into your plugin.

-Andreas

Re: Multiple input to a splitBodyFeature ?

kandennti — Wed, 23 Feb 2022 23:19:51 GMT

@andreas.pedersen8EDUH .

>it will still require 700 tool-boxes ?

Yes, it is.
I'd like to try it out and compare, but I'm busy with work and don't have the time.

Re: Multiple input to a splitBodyFeature ?

kandennti — Thu, 24 Feb 2022 14:38:25 GMT

@andreas.pedersen8EDUH .

We created a sample to compare.

I didn't know how to do the splitting using TemporaryBRepManager, so I used the booleanOperation method.

The result of my test was that TemporaryBRepManager was faster to process.
I feel that the reason for the slowness is the fact that Component.bRepBodies.add needs to be done twice when using the analyzeInterference method.

# Fusion360API Python script import traceback import adsk.fusion import adsk.core import time def run(context): ui = adsk.core.UserInterface.cast(None) try: app: adsk.core.Application = adsk.core.Application.get() ui = app.userInterface des: adsk.fusion.Design = app.activeProduct msg: str = 'Select Solid Body' selFiltter: str = 'SolidBodies' sel: adsk.core.Selection = selectEnt(msg, selFiltter) if not sel: return targetBody:adsk.fusion.BRepBody = sel.entity des.designType = adsk.fusion.DesignTypes.ParametricDesignType # start test app.log(' -- test start --') t = time.time() # Please switch between test1 and test2 to execute. test1(targetBody) # Design.analyzeInterference # test2(targetBody) # TemporaryBRepManager.booleanOperation app.log(f'done: {time.time() - t} s') 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.get() ui = app.userInterface sel = ui.selectEntity(msg, filterStr) return sel except: return None # TemporaryBRepManager.booleanOperation Method # https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-F845AD0E-D25F-4FDD-B31B-3E6DFC5A8A9B def test2( targetBody: adsk.fusion.BRepBody, step: float = 1): app: adsk.core.Application = adsk.core.Application.get() measMgr: adsk.core.MeasureManager = app.measureManager oriBBox: adsk.core.OrientedBoundingBox3D = measMgr.getOrientedBoundingBox( targetBody, adsk.core.Vector3D.create(1, 0, 0), adsk.core.Vector3D.create(0, 1, 0), ) minZ = oriBBox.centerPoint.z - oriBBox.height * 0.5 halfStep = step * 0.5 count = int((oriBBox.height // step) + 1) baseBBox: adsk.core.OrientedBoundingBox3D = oriBBox.copy() baseBBox.centerPoint = adsk.core.Point3D.create( oriBBox.centerPoint.x, oriBBox.centerPoint.y, minZ + halfStep ) baseBBox.height = step tempMgr: adsk.fusion.TemporaryBRepManager = adsk.fusion.TemporaryBRepManager.get() tempBodies = [] for idx in range(count): bBox: adsk.core.OrientedBoundingBox3D = baseBBox.copy() pnt: adsk.core.Point3D = bBox.centerPoint.copy() pnt.z = minZ + halfStep + (step * idx) bBox.centerPoint = pnt tempBodies.append(tempMgr.createBox(bBox)) # -- Same process until this part -- resBodies = [] for tempBody in tempBodies: clone: adsk.fusion.BRepBody = tempMgr.copy(targetBody) tempMgr.booleanOperation( clone, tempBody, adsk.fusion.BooleanTypes.IntersectionBooleanType ) resBodies.append(clone) comp: adsk.fusion.Component = targetBody.parentComponent bodies: adsk.fusion.BRepBodies = comp.bRepBodies resBaseFeat: adsk.fusion.BaseFeature = comp.features.baseFeatures.add() resBaseFeat.startEdit() try: for body in resBodies: bodies.add( body, resBaseFeat ) except: pass finally: resBaseFeat.finishEdit() app.log(f' bodies count: {resBaseFeat.bodies.count}') # Design.analyzeInterference Method # https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-7B17A057-49A7-4332-ACD1-F6FA4EA84C88 def test1( targetBody: adsk.fusion.BRepBody, step: float = 1): app: adsk.core.Application = adsk.core.Application.get() measMgr: adsk.core.MeasureManager = app.measureManager oriBBox: adsk.core.OrientedBoundingBox3D = measMgr.getOrientedBoundingBox( targetBody, adsk.core.Vector3D.create(1, 0, 0), adsk.core.Vector3D.create(0, 1, 0), ) minZ = oriBBox.centerPoint.z - oriBBox.height * 0.5 halfStep = step * 0.5 count = int((oriBBox.height // step) + 1) baseBBox: adsk.core.OrientedBoundingBox3D = oriBBox.copy() baseBBox.centerPoint = adsk.core.Point3D.create( oriBBox.centerPoint.x, oriBBox.centerPoint.y, minZ + halfStep ) baseBBox.height = step tempMgr: adsk.fusion.TemporaryBRepManager = adsk.fusion.TemporaryBRepManager.get() tempBodies = [] for idx in range(count): bBox: adsk.core.OrientedBoundingBox3D = baseBBox.copy() pnt: adsk.core.Point3D = bBox.centerPoint.copy() pnt.z = minZ + halfStep + (step * idx) bBox.centerPoint = pnt tempBodies.append(tempMgr.createBox(bBox)) # -- Same process until this part -- comp: adsk.fusion.Component = targetBody.parentComponent bodies: adsk.fusion.BRepBodies = comp.bRepBodies bodyObjs: adsk.core.ObjectCollection = adsk.core.ObjectCollection.create() bodyObjs.add(targetBody) toolBaseFeat: adsk.fusion.BaseFeature = comp.features.baseFeatures.add() toolBaseFeat.startEdit() try: for body in tempBodies: bodyObjs.add( bodies.add( body, toolBaseFeat ) ) except: pass finally: toolBaseFeat.finishEdit() des: adsk.fusion.Design = app.activeProduct interferanceResults: adsk.fusion.InterferenceResults = des.analyzeInterference( des.createInterferenceInput(bodyObjs) ) interBodies = [] res: adsk.fusion.InterferenceResult for res in interferanceResults: interBodies.append(res.interferenceBody) resBaseFeat: adsk.fusion.BaseFeature = comp.features.baseFeatures.add() resBaseFeat.startEdit() try: for body in interBodies: bodies.add( body, resBaseFeat ) except: pass finally: resBaseFeat.finishEdit() # resBaseFeat.bodies.count <- 0 app.log(f' bodies count: {len(interBodies)}') toolBaseFeat.deleteMe()

Re: Multiple input to a splitBodyFeature ?

andreas.pedersen8EDUH — Fri, 25 Feb 2022 08:25:41 GMT

WOW! That was lightning fast compared to my code!

It went from 221 seconds to 10.5 seconds!

I dont need the resulting bodies, just the volumes, best thing is if there is no change on the original model.

Edited your code to not add the resulting bodies, just collectiong their volumes, and the execution time went down to 5.9 seconds! That is very acceptable for me!

Thank you,@kandennti so much!

-Andreas