Modify radius of solid body (cylinder/sphere)

[j.han97]

Hi all,

I am trying to modify radius of curved body (cylinder/sphere) via API. I have tried the OffsetFeatures in the documentation but it seemed to offset the surface ONLY instead of the whole body.

I have used the sample code in the documentation:

def demo_offsetFeatures_add(rootComp: adsk.fusion.Design.rootComponent):
    offsetFace = _ui.selectEntity('Select the face to offset.', 'Faces').entity
    offsetFaces = adsk.core.ObjectCollection.create()
    offsetFaces.add(offsetFace)
    distance = adsk.core.ValueInput.createByReal(2)
    operation = adsk.fusion.FeatureOperations.NewBodyFeatureOperation

    offsetFeatures = rootComp.features.offsetFeatures
    input = offsetFeatures.createInput(offsetFaces, distance, operation)
    offsetFeature = offsetFeatures.add(input)

This results in a new surface body.

Is there any way to modify the radius of the solid body? Any help is appreciated!

[kandennti]

Hi @j.han97 .

I thought I could just set the operation of OffsetFeatures.createInput to "JoinFeatureOperation".

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-2c24d7ef-a571-4d01-aa9f-987ee8620022 

# Fusion360API Python script

import traceback
import adsk.fusion
import adsk.core

def run(context):
    ui: adsk.core.UserInterface = None
    try:
        app: adsk.core.Application = adsk.core.Application.get()
        ui = app.userInterface

        msg: str = 'Select the face to offset.'
        selFiltter: str = 'Faces'
        sel: adsk.core.Selection = selectEnt(msg, selFiltter)
        if not sel:
            return

        # select face
        offsetFace: adsk.fusion.BRepFace = sel.entity

        # ObjectCollection
        offsetFaces: adsk.core.ObjectCollection = adsk.core.ObjectCollection.create()
        offsetFaces.add(offsetFace)

        # component
        comp: adsk.fusion.Component = offsetFace.body.parentComponent

        # OffsetFacesFeatures
        offsetFeatures: adsk.fusion.OffsetFeatures = comp.features.offsetFeatures

        # OffsetFeatureInput
        offsetIpt: adsk.fusion.OffsetFeatureInput = offsetFeatures.createInput(
            offsetFaces,
            adsk.core.ValueInput.createByReal(2),
            # adsk.fusion.FeatureOperations.NewBodyFeatureOperation # surface
            adsk.fusion.FeatureOperations.JoinFeatureOperation # error
        )

        # create OffsetFeature
        offsetFeature: adsk.fusion.OffsetFeature = offsetFeatures.add(offsetIpt)

    except:
        if ui:
            ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

def selectEnt(
        msg: str,
        filtterStr: str) -> adsk.core.Selection:

    try:
        app = adsk.core.Application.get()
        ui = app.userInterface
        sel = ui.selectEntity(msg, filtterStr)
        return sel
    except:
        return None

When I actually try this, I get an error.
I was not able to Offset the solid.

[j.han97]

Hi kandennti,

Thanks for your reply!

I have noticed this line in the documentation:

'NewBodyFeatureOperation' and 'NewComponentFeatureOperation' are the options supported.

---

I guess Fusion 360 API simply does not support this function at current stage.