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# yTwistNode.py

    #-
    # ==========================================================================
    # Copyright (C) 1995 - 2006 Autodesk, Inc. and/or its licensors.  All
    # rights reserved.
    #
    # The coded instructions, statements, computer programs, and/or related
    # material (collectively the "Data") in these files contain unpublished
    # information proprietary to Autodesk, Inc. ("Autodesk") and/or its
    # licensors, which is protected by U.S. and Canadian federal copyright
    # law and by international treaties.
    #
    # The Data is provided for use exclusively by You. You have the right
    # to use, modify, and incorporate this Data into other products for
    # purposes authorized by the Autodesk software license agreement,
    # without fee.
    #
    # The copyright notices in the Software and this entire statement,
    # including the above license grant, this restriction and the
    # following disclaimer, must be included in all copies of the
    # Software, in whole or in part, and all derivative works of
    # the Software, unless such copies or derivative works are solely
    # in the form of machine-executable object code generated by a
    # source language processor.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
    # AUTODESK DOES NOT MAKE AND HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED
    # WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF
    # NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
    # PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE, OR
    # TRADE PRACTICE. IN NO EVENT WILL AUTODESK AND/OR ITS LICENSORS
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    # DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES, EVEN IF AUTODESK
    # AND/OR ITS LICENSORS HAS BEEN ADVISED OF THE POSSIBILITY
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    # ==========================================================================
    #+

    # import maya
    # maya.cmds.loadPlugin("yTwistNode.py")
    # maya.cmds.sphere()
    # maya.cmds.deformer( type='spyTwistNode' )

    import math, sys

    import maya.OpenMaya as OpenMaya
    import maya.OpenMayaAnim as OpenMayaAnim
    import maya.OpenMayaMPx as OpenMayaMPx

    kPluginNodeTypeName = "spyTwistNode"

    yTwistNodeId = OpenMaya.MTypeId(0x8702)

    # Node definition
    class yTwistNode(OpenMayaMPx.MPxDeformerNode):
        # class variables
        angle = OpenMaya.MObject()
        # constructor
        def __init__(self):
            OpenMayaMPx.MPxDeformerNode.__init__(self)
        # deform
        def deform(self,dataBlock,geomIter,matrix,multiIndex):
            #
            # get the angle from the datablock
            angleHandle = dataBlock.inputValue( self.angle )
            angleValue = angleHandle.asDouble()
            #
            # get the envelope
            envelope = OpenMayaMPx.cvar.MPxDeformerNode_envelope
            envelopeHandle = dataBlock.inputValue( envelope )
            envelopeValue = envelopeHandle.asFloat()
            #
            # iterate over the object and change the angle
            while geomIter.isDone() == False:
                point = geomIter.position()
                ff = angleValue * point.y * envelopeValue
                if ff != 0.0:
                    cct= math.cos(ff)
                    cst= math.sin(ff)
                    tt= point.x*cct-point.z*cst
                    point.z= point.x*cst + point.z*cct
                    point.x=tt
                geomIter.setPosition( point )
                geomIter.next()

    # creator
    def nodeCreator():
        return OpenMayaMPx.asMPxPtr( yTwistNode() )

    # initializer
    def nodeInitializer():
        # angle
        nAttr = OpenMaya.MFnNumericAttribute()
        yTwistNode.angle = nAttr.create( "angle", "fa", OpenMaya.MFnNumericData.kDouble, 0.0 )
        #nAttr.setDefault(0.0)
        nAttr.setKeyable(True)
        # add attribute
        try:
            yTwistNode.addAttribute( yTwistNode.angle )
            outputGeom = OpenMayaMPx.cvar.MPxDeformerNode_outputGeom
            yTwistNode.attributeAffects( yTwistNode.angle, outputGeom )
        except:
            sys.stderr.write( "Failed to create attributes of %s node\n", kPluginNodeTypeName )

    # initialize the script plug-in
    def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.registerNode( kPluginNodeTypeName, yTwistNodeId, nodeCreator, nodeInitializer, OpenMayaMPx.MPxNode.kDeformerNode )
        except:
            sys.stderr.write( "Failed to register node: %s\n" % kPluginNodeTypeName )

    # uninitialize the script plug-in
    def uninitializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
            mplugin.deregisterNode( yTwistNodeId )
        except:
            sys.stderr.write( "Failed to unregister node: %s\n" % kPluginNodeTypeName )