Try using myNode.thisMObject() instead of OpenMaya.MObject(), thus removing the need to have a myMojbect at all.... Also, the callback function needs to have and only have the arguments found in MNodeMessage::MAttr2PlugFunction. If *args isn't that, then it isn't going to work... On Sep 3, 5:10 pm, johnvdz <[email protected]> wrote: > thanks guys. > > this is basically what i have. > > class myNode(OpenMayaMPx.MPxDeformerNode ): > myMobject=OpenMaya.MObject() > def __init__(self): > OpenMayaMPx.MPxDeformerNode.__init__( self ) > def postConstructor(self): > > attrChangedCBId=OpenMaya.MNodeMessage.addAttributeChangedCallback( > myNode.myMobject, myNode.attrChangedCallback, self) > def attrChangedCallback(*args): > print 'this node callback is working' > > however i generally get a > > # RuntimeError: (kInvalidParameter): Unexpected Internal Failure // > this is in the post constructor. > > not sure if i have implemented it wrong > > john > > On 09/04/2011 05:44 AM, Chad Vernon wrote: > > > > > > > > > You can also use setDependentsDirty to check when things change. > > > On Sat, Sep 3, 2011 at 12:33 PM, notanymike <[email protected] > > <mailto:[email protected]>> wrote: > > > In c++ I usually install it in MPxNode's postConstructor method and > > remove it in it's ~MPxNode method > > > However I don't know what the "~" equivalent to Python is... > > > On Sep 3, 7:49 am, johnvdz <[email protected] > > <mailto:[email protected]>> wrote: > > > hi all, > > > > i'm really scratching my head here. anyone know of an example > > out there > > > for attributeCallbacks > > (MNodeMessage.addAttributeChangedCallback) within > > > a deformer or mpxnode. > > > > not sure if i should be putting this in the __init__ func or in > > its own > > > custom constructor. > > > > I'm not really sure about what its passing how to deal with what it > > > passes so any examples would be great. Google search doesn't > > bring up > > > much python stuff. > > > > i need to be able to pass some message to update for the node to > > > recalculate an array of values. > > > > thanks in advance > > > > john > > > -- > > view archives:http://groups.google.com/group/python_inside_maya > > change your subscription settings: > > http://groups.google.com/group/python_inside_maya/subscribe > > > -- > > view archives:http://groups.google.com/group/python_inside_maya > > change your subscription settings: > >http://groups.google.com/group/python_inside_maya/subscribe
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