topic Error when reading rotationValue in Fusion API and Scripts Forum

Error when reading rotationValue

Anonymous — Mon, 12 Oct 2020 22:26:54 GMT

I am trying to change the angel of a simple revolution as BuiltIn joint like this:

import adsk.core, adsk.fusion, adsk.cam, traceback def run(context): ui = None try: app = adsk.core.Application.get() ui = app.userInterface design = adsk.fusion.Design.cast(app.activeProduct) root = design.rootComponent occ = root.occurrences.itemByName("MyComponent:1") ui.messageBox(occ.name) driveJoint = occ.component.asBuiltJoints.itemByName("Rev7") revMotion = adsk.fusion.RevoluteJointMotion.cast(driveJoint.jointMotion) somevar = revMotion.rotationValue revMotion.rotationValue = somevar ui.messageBox(revMotion.rotationValue) except: if ui: ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

The problem is that I always get an error when trying to read the value of `rotationValue` like in this line:

revMotion.rotationValue

--------------------------- Fusion 360 --------------------------- Failed: Traceback (most recent call last): File "C:/Users/XXX/AppData/Roaming/Autodesk/Autodesk Fusion 360/API/Scripts/Simulator/Simulator.py", line 22, in run somevar = revMotion.rotationValue File "C:/Users/XXX/AppData/Local/Autodesk/webdeploy/production/e93c21ea16478b49c4dee1f65accf1a11ae6ef96/Api/Python/packages\adsk\fusion.py", line 50025, in _get_rotationValue return _fusion.RevoluteJointMotion__get_rotationValue(self) RuntimeError: 2 : InternalValidationError : axis --------------------------- OK ---------------------------

Could anyone help me to get rid of this error? I cannot understand totally why this is happening..

What I am trying to achieve is getting a relative motion, so just to increase the current angel like this:

revMotion.rotationValue = revMotion.rotationValue + 1

Re: Error when reading rotationValue

kandennti — Tue, 13 Oct 2020 04:04:10 GMT

Hi @Anonymous .

Isn't driveJoint set to None?

driveJoint = occ.joints.itemByName ("Rev7")

How about changing to?

Re: Error when reading rotationValue

Anonymous — Tue, 13 Oct 2020 07:03:12 GMT

Hello, actually noy because I am able to move the joint when I write an explicit value to the rotationValue, but reading it causes the error.

Re: Error when reading rotationValue

kandennti — Wed, 14 Oct 2020 00:54:33 GMT

I ran the following code with the model data in the attachment.
I couldn't reproduce the situation.

import adsk.core, adsk.fusion, adsk.cam, traceback def run(context): ui = None try: app = adsk.core.Application.get() ui = app.userInterface design = adsk.fusion.Design.cast(app.activeProduct) root = design.rootComponent occ = root.occurrences.itemByName("MyComponent:1") ui.messageBox(occ.name) driveJoint = occ.joints.itemByName("Rev7") revMotion = adsk.fusion.RevoluteJointMotion.cast(driveJoint.jointMotion) somevar = revMotion.rotationValue revMotion.rotationValue = somevar ui.messageBox(str(revMotion.rotationValue)) except: if ui: ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))