pymel.api.plugins¶

from pymel.api.plugins import Command
class testCmd(Command):
    def doIt(self, args):
        print "doIt..."

testCmd.register()
cmds.testCmd()
testCmd.deregister()

import math

import pymel.api.plugins as plugins
import maya.OpenMaya as om

class PymelSineNode(plugins.DependNode):
    '''Example node adapted from maya's example sine node plugin

    Shows how much easier it is to create a plugin node using pymel.api.plugins
    '''
    # For quick testing, if _typeId is not defined, pymel will create one by
    # hashing the node name. For longer-term uses, you should explicitly set
    # own typeId like this
    #
    # (NOTE - if using the automatic typeId generation, the hashlib python
    # builtin library must be functional / working from within maya... due
    # to dynamic library linking issues (ie, libssl, libcrypto), this
    # may not always be the case out-of-the-box on some linux distros
    _typeId = om.MTypeId(0x900FF)

    # by default, the name of the node will be the name of the class - to
    # override and set your own maya node name, do this:
    #_name = 'PymelSineNode'

    @classmethod
    def initialize(cls):
        # input
        nAttr = om.MFnNumericAttribute()
        cls.input = nAttr.create( "input", "in", om.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        cls.addAttribute( cls.input )

        # output
        cls.output = nAttr.create( "output", "out", om.MFnNumericData.kFloat, 0.0 )
        nAttr.setStorable(1)
        nAttr.setWritable(1)
        cls.addAttribute( cls.output )

        # set attributeAffects relationships
        cls.attributeAffects( cls.input, cls.output )

    def compute(self, plug, dataBlock):
        if ( plug == self.output ):
            dataHandle = dataBlock.inputValue( self.input )
            inputFloat = dataHandle.asFloat()
            result = math.sin( inputFloat )
            outputHandle = dataBlock.outputValue( self.output )
            outputHandle.setFloat( result )
            dataBlock.setClean( plug )
            return om.MStatus.kSuccess
        return om.MStatus.kUnknownParameter

## initialize the script plug-in
def initializePlugin(mobject):
    PymelSineNode.register(mobject)

# uninitialize the script plug-in
def uninitializePlugin(mobject):
    PymelSineNode.deregister(mobject)