custom node array attribute not saved properly

[casf01]

I have this node that store an array of 2 double

                nAttr = om.MFnNumericAttribute()

               myNode.points = nAttr.create("Points", "p", om.MFnNumericData.k2Double)

             nAttr.storable = True

          nAttr.readable = True

          nAttr.array        = True

              nAttr.writable = True

          myNode.addAttribute(myNode.points)

then when I do go in the node hit add a new item save my scene and re-open it, the array is empty but when I change the value to something else like (1.0, 0)and save it's fine and it my (1.0, 0 ) value is saved.

It seems like an item with a default value won't save itself :/

What can I do ?

[Fred]

so far the only solution I found was to set the attribute to keyable and key the default value if needed but that doens't seems like the best solution

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[Michael Boon]

Have you tried doing it inside an MDGModifier? I haven't, but my guess would be that the DG is not being updated until you set a key.

[Angelo Sta. Catalina]

The default behavior for an MPxNode is to only save when the value differs from the default value or if there is an incoming connection. You can read more about it in the MPxNode doc's. You can change the behavior by overwriting the method:

om.MPxNode.shouldSave()

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[casf01]

Thanks, overriding the shouldSave method fixed the issue :)