Hi Guys,
I'm trying to create a custom MPX node, which is doing some
calculation based on a bone's scale in a hierarchy. So far my compute
code is working properly. I want to run the compute block always if
the any bone in the hierarchy got new world matrix (either by pos, rot
or scale change). But what I'm getting here, worldmatrix attribute of
a node not getting changed always untill you querry from outside (eg.
through MEL). Below is my test code....I have a input matrix plug
which connected to worlMatrix of a tranformNode. I expect when I'm
scaling or moving position of the transform node...compute block of my
node should get called...but not getting desired result...am I missing
somthing?
Thanks
Susanta
class ChainLengthCalc(omx.MPxNode):
kPluginNodeTypeName = "ChainLengthCalc"
kPluginNodeTypeId = om.MTypeId(0xd1a9257)
def __init__(self):
omx.MPxNode.__init__(self)
def compute(self,plug,dataBlock):
if plug == self.currentChainLength:
print "hello"
return om.MStatus.kSuccess;
return m.MStatus.kUnknownParameter;
@classmethod
def creator(cls):
return omx.asMPxPtr( cls() )
@classmethod
def initialize(cls):
unitAttr = om.MFnUnitAttribute()
cls.currentChainLength = \
unitAttr.create("currentChainLength", "ccl",
om.MFnUnitAttribute.kDistance, 0)
unitAttr.setKeyable(False)
unitAttr.setWritable(False)
cls.addAttribute(cls.currentChainLength)
mAttr = om.MFnMatrixAttribute()
cls.drivingBoneMatrixAttr = mAttr.create( "drivingBoneMatrix",
"dbm")
mAttr.setStorable(True)
mAttr.setWritable(True)
cls.addAttribute(cls.drivingBoneMatrixAttr)
cls.attributeAffects(cls.drivingBoneMatrixAttr,
cls.currentChainLength)
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