Reproducible crash when adding attribute to face in direct edit mode

[JesusFreke]

The below script seems like it should be fine, but it causes fusion 360 to hang for a couple of seconds and then crash.

import adsk.core
import adsk.fusion
import traceback

app = adsk.core.Application.get()
root = adsk.core.Application.get().activeProduct.rootComponent

def _create_component(parent_component, *bodies, name):
    new_occurrence = parent_component.occurrences.addNewComponent(adsk.core.Matrix3D.create())
    new_occurrence.component.name = name
    for body in bodies:
        new_occurrence.component.bRepBodies.add(body)
    return new_occurrence


def box(x, y, z, *, name="Box") -> adsk.fusion.Occurrence:
    box_body = adsk.fusion.TemporaryBRepManager.get().createBox(adsk.core.OrientedBoundingBox3D.create(
        adsk.core.Point3D.create(x/2, y/2, z/2),
        adsk.core.Vector3D.create(1, 0, 0),
        adsk.core.Vector3D.create(0, 1, 0),
        x, y, z))
    occurrence = _create_component(root, box_body, name=name)
    return occurrence


def run(context):
    try:
        app.activeProduct.designType = adsk.fusion.DesignTypes.DirectDesignType
        first = box(1, 1, 1, name="first")
        first.bRepBodies[0].faces[0].attributes.add("namespace", "name", "value")
    except:
        traceback.print_exc()

The crash occurs at the last line of run(), where it tries to add an attribute to a face. The crash doesn't happen in parametric mode (with _create_component using a base feature to add the body to the new component, of course).

[JesusFreke]

I played around with this a bit more, and it seems like this only occurs for bodies that were created with the TemporaryBRepManager and then added to a component.

I did find a workaround at least. You can temporarily go into parametric mode just before adding the temporary body to the component, add the body in the context of a base feature, and then go back into direct mode immediately afterward. Afterwards, you can set an attribute on one of the body's faces without triggering the crash.

def _create_component(parent_component, *bodies, name):
    app.activeProduct.designType = adsk.fusion.DesignTypes.ParametricDesignType
    new_occurrence = parent_component.occurrences.addNewComponent(adsk.core.Matrix3D.create())
    base_feature = new_occurrence.component.features.baseFeatures.add()
    base_feature.startEdit()
    new_occurrence.component.name = name
    for body in bodies:
        new_occurrence.component.bRepBodies.add(body, base_feature)
    base_feature.finishEdit()
    app.activeProduct.designType = adsk.fusion.DesignTypes.DirectDesignType
    return new_occurrence