sineNode.py

#-
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# import maya
# maya.cmds.loadPlugin("sineNode.py")
# maya.cmds.createNode("spSineNode")
# maya.cmds.getAttr("spSineNode1.output")

import math, sys

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

kPluginNodeTypeName = "spSineNode"

sineNodeId = OpenMaya.MTypeId(0x87000)

# Node definition
class sineNode(OpenMayaMPx.MPxNode):
        # class variables
        input = OpenMaya.MObject()
        output = OpenMaya.MObject()
        def __init__(self):
                OpenMayaMPx.MPxNode.__init__(self)
        def compute(self,plug,dataBlock):
                if ( plug == sineNode.output ):
                        dataHandle = dataBlock.inputValue( sineNode.input )
                        
                        inputFloat = dataHandle.asFloat()
                        result = math.sin( inputFloat ) * 10.0
                        outputHandle = dataBlock.outputValue( sineNode.output )
                        outputHandle.setFloat( result )
                        dataBlock.setClean( plug )

                return OpenMaya.kUnknownParameter

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

# initializer
def nodeInitializer():
        # input
        nAttr = OpenMaya.MFnNumericAttribute()
        sineNode.input = nAttr.create( "input", "in", OpenMaya.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        # output
        nAttr = OpenMaya.MFnNumericAttribute()
        sineNode.output = nAttr.create( "output", "out", OpenMaya.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        nAttr.setWritable(1)
        # add attributes
        sineNode.addAttribute( sineNode.input )
        sineNode.addAttribute( sineNode.output )
        sineNode.attributeAffects( sineNode.input, sineNode.output )
        
# initialize the script plug-in
def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
                mplugin.registerNode( kPluginNodeTypeName, sineNodeId, nodeCreator, nodeInitializer )
        except:
                sys.stderr.write( "Failed to register node: %s" % kPluginNodeTypeName )
                raise

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