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A maya custom node for output motion path with heart shape
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"""A maya custom node for output motion path with heart shape""" | |
__author__ = 'Huang Weibo <xracz.fx@gmail.com>' | |
__version__ = '1.0' | |
__status__ = "release" | |
__date__ = "2013/3/12" | |
__copyright__ = "Copyright 2013, riggingtd.com" | |
import math, sys | |
import maya.OpenMaya as OpenMaya | |
import maya.OpenMayaMPx as OpenMayaMPx | |
kPluginNodeTypeName = "heartNode" | |
heartNodeId = OpenMaya.MTypeId(0x1001111) | |
# Node definition | |
class HeartNode(OpenMayaMPx.MPxNode): | |
# class variables | |
aOutX = OpenMaya.MObject() | |
aOutY = OpenMaya.MObject() | |
aInValue = OpenMaya.MObject() | |
def __init__(self): | |
super(HeartNode,self).__init__() | |
def compute(self,plug,dataBlock): | |
if (plug != HeartNode.aOutX and plug != HeartNode.aOutY): | |
return OpenMaya.kUnknownParameter | |
inputValue = dataBlock.inputValue (HeartNode.aInValue).asFloat() | |
#heart curve function formula | |
outputX = 16*math.pow(math.sin(inputValue),3) | |
outputY = 13*math.cos(inputValue) - 5*math.cos(2*inputValue) \ | |
- 2*math.cos(3*inputValue) - math.cos(4*inputValue) | |
try: | |
hOutputX = dataBlock.outputValue (HeartNode.aOutX) | |
hOutputY = dataBlock.outputValue (HeartNode.aOutY) | |
except: | |
sys.stderr.write ('Failed to get MDataHandle outputValue output') | |
raise | |
hOutputX.setFloat (outputX) | |
hOutputX.setClean() | |
hOutputY.setFloat (outputY) | |
hOutputY.setClean() | |
dataBlock.setClean(plug) | |
return OpenMaya.MStatus.kSuccess | |
# creator | |
def nodeCreator(): | |
return OpenMayaMPx.asMPxPtr( HeartNode() ) | |
# initializer | |
def nodeInitializer(): | |
nAttr = OpenMaya.MFnNumericAttribute() | |
# output | |
HeartNode.aOutX = nAttr.create( "outX", "outX", OpenMaya.MFnNumericData.kFloat, 0.0 ) | |
nAttr.setWritable (0) | |
nAttr.setStorable (0) | |
HeartNode.addAttribute (HeartNode.aOutX) | |
HeartNode.aOutY = nAttr.create( "outY", "outY", OpenMaya.MFnNumericData.kFloat, 0.0 ) | |
nAttr.setWritable (0) | |
nAttr.setStorable (0) | |
HeartNode.addAttribute (HeartNode.aOutY) | |
# input | |
HeartNode.aInValue = nAttr.create( "inValue", "inValue", OpenMaya.MFnNumericData.kFloat, 0.0 ) | |
nAttr.setKeyable (1) | |
HeartNode.addAttribute (HeartNode.aInValue) | |
HeartNode.attributeAffects (HeartNode.aInValue, HeartNode.aOutX) | |
HeartNode.attributeAffects (HeartNode.aInValue, HeartNode.aOutY) | |
return OpenMaya.MStatus.kSuccess | |
# initialize the script plug-in | |
def initializePlugin(mobject): | |
mplugin = OpenMayaMPx.MFnPlugin(mobject) | |
try: | |
mplugin.registerNode( kPluginNodeTypeName, heartNodeId, 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( heartNodeId ) | |
except: | |
sys.stderr.write( "Failed to deregister node: %s" % kPluginNodeTypeName ) | |
raise |
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