Maya Plug

[Rémi Deletrain]

Hello everyone.

I have a problem with Mplug.

I try to create inputs in MFnNumericsAttribute array in connectionMade function of my MPxNode.

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#   Function when connection made in node

def connectionMade(self, plug, otherPlug, asSrc):

    if not asSrc and plug == self.aSourceGeometry:

        self.add_weights_attributes(plug)

    return OpenMayaMPx.MPxNode.connectionMade(self, plug, otherPlug, asSrc)

#   Add weights attributes from source geometry cvs

def add_weights_attributes(self, plug):

    #   Plug Datas

    sourceGeometryHandle = OpenMaya.MPlug(self.thisMObject(), self.aSourceGeometry)

    sourceGeometryObject = sourceGeometryHandle.asMObject()

    weightsHandle = OpenMaya.MPlug(self.thisMObject(), self.aInputWeights)

    #   Curve

    mfnCurve = OpenMaya.MFnNurbsCurve(sourceGeometryObject)

    numCVs = mfnCurve.numCVs()

    #   Set Num of weights element

    weightsHandle.setNumElements(numCVs)

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I wish that when I connect a geometry in my node It adds as many inputs in my MFnNumericAttribut there points.

I thought it was this command "setNumElements" but nothing happens ...

Someone an idea? 

[Daniel Lindsey]

You need to set the attribute to an array type, and if you want to build it, you need to use the setUsesArrayBuilder as well.

[Rémi Deletrain]

THX Daniel.

Indeed I try with arrayBuilder and it works