identity matrix - causing problems

[MichaelT_123]

Hi WhomInTheKnow,

I have spent quite few hours trying to debug some dynamic code. I would have never considered that identity matrix will show malicious behaviour, but it did!

It turns that moveFeature can not accept identity matrix as an argument.

It is hard to believe, isn't it?

Please check it yourself by running moveFeature sample script while commenting one line (red marker):

        # Create a transform to do move

        vector = adsk.core.Vector3D.create(0.0, 10.0, 0.0)

        transform = adsk.core.Matrix3D.create()

        #transform.translation = vector

The error is symptomatically cryptic:

    moveFeats.add(moveFeatureInput)

  File "C:/Users/MichaelT/AppData/Local/Autodesk/webdeploy/production/20eba7b8590bd15aa5cf30169381ceca41f2dc77/Api/Python/packages\adsk\fusion.py", line 18803, in add

    return _fusion.MoveFeatures_add(self, *args)

RuntimeError: 3 : invalid transform

Sincerely

MichaelT

[kandennti]

Hi MichaelT_123.

I tried changing this sample.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-153E540B-6246-460C-8B6A-4C58165CEBAA 

Certainly an error occurred.
Since there is no point in converting with the identity matrix,
It seems necessary to check in advance.

・・・
        # Create a transform to do move
        vector = adsk.core.Vector3D.create(0.0, 10.0, 0.0)
        transform = adsk.core.Matrix3D.create()
        #transform.translation = vector

        if transform.isEqualTo(adsk.core.Matrix3D.create()):
            return

        # Create a move feature
        moveFeats = features.moveFeatures
・・・

In the conversion that does nothing even manually, the OK button was gray and could not be pressed.

[MichaelT_123]

Hi Kondennti-san,

Thank you for checking,... it means that it is not the fatamorgana.

Identity matrix is the foundation of ALGEBRA as we know it. Also Identity has the special and well understood meanings in many other fields. 

Disallowing or disobeying its properties in any system and particularly in geometrical one is a NONSENSE.

With Regards

MichaelT