Plugin crashing..but not always

[Pedro Domingo]

Hi,

I have been working a few days in my first plugin node. Is just a pose reader with a editable cone angle value and 3 world matrix input.

It works perfectly, but sometimes, when some automated process affects the whole rig (like adding a constraint to the global rig and adding rotation to it) maya freezes.

I assume it's an unexpected loop on the plugin node, but I have not enough experience creating maya nodes to catch this error.

This is the code:

import maya.OpenMayaMPx as OpenMayaMPx

import maya.OpenMaya as om

import math

 

class PoseReaderNode(OpenMayaMPx.MPxNode):

    kPluginNodeId = om.MTypeId(0x00000120) 

 

    coneTarget = om.MObject() 

    coneAperture = om.MObject()

    coneBase = om.MObject()

    distance = om.MObject()

    coneRadius = om.MObject()

    coneTargetMatrix = om.MObject()

 

    def __init__(self):

        OpenMayaMPx.MPxNode.__init__(self)

 

    def compute(self, plug, data): #ok - the actual computation

        targetInputMatrixDataHandle = om.MDataHandle(data.inputValue( PoseReaderNode.coneTarget ))

        targetValue = targetInputMatrixDataHandle.asMatrix()

        apertureInputMatrixDataHandle = om.MDataHandle(data.inputValue( PoseReaderNode.coneAperture ))

        apertureValue = apertureInputMatrixDataHandle.asMatrix()

        baseInputMatrixDataHandle = om.MDataHandle(data.inputValue( PoseReaderNode.coneBase ))

        baseValue = baseInputMatrixDataHandle.asMatrix()

        coneRadius = data.inputValue(PoseReaderNode.coneRadius).asFloat()

        disOutput = data.outputValue(PoseReaderNode.distance)

        

        # FORM A

        targetMatrix = om.MTransformationMatrix(targetValue)

        apertureMatrix = om.MTransformationMatrix(apertureValue)

        baseMatrix = om.MTransformationMatrix(baseValue)

        target = targetMatrix.translation(om.MSpace.kWorld)

        aperture = apertureMatrix.translation(om.MSpace.kWorld)

        base = baseMatrix.translation(om.MSpace.kWorld)

        targetVec = target - base

        currentPoseVec = aperture - base

        angle = math.degrees(targetVec.angle(currentPoseVec))

        halfCone = float(coneRadius)*0.5

        ratioAngle = float(angle)/float(halfCone)

        if ratioAngle > 1:

            d = 0

        else:

            d = 1-ratioAngle

        disOutput.setFloat(float(d))

        data.setClean(plug)

def creator():

    return OpenMayaMPx.asMPxPtr(PoseReaderNode()) 

 

def initialize():

    nAttr = om.MFnNumericAttribute() 

    PoseReaderNode.coneRadius = nAttr.create("coneRadius","radius", om.MFnNumericData.kFloat,90.0)

    nAttr.setWritable(True)

    nAttr.setStorable(True)

    PoseReaderNode.addAttribute(PoseReaderNode.coneRadius)

    nAttr = om.MFnNumericAttribute() 

    PoseReaderNode.distance = nAttr.create("distance","dist", om.MFnNumericData.kFloat,0.0)

    nAttr.setWritable(False)

    nAttr.setStorable(True)

    PoseReaderNode.addAttribute(PoseReaderNode.distance)

    nMatrixAttr = om.MFnMatrixAttribute()

    PoseReaderNode.coneBase = nMatrixAttr.create("coneBase","base", om.MFnMatrixAttribute.kDouble)

    nMatrixAttr.setWritable(True)

    nMatrixAttr.setHidden(True)

    PoseReaderNode.addAttribute(PoseReaderNode.coneBase)

    nMatrixAttr = om.MFnMatrixAttribute()

    PoseReaderNode.coneTarget = nMatrixAttr.create("coneTarget","target", om.MFnMatrixAttribute.kDouble)

    nMatrixAttr.setWritable(True)

    nMatrixAttr.setHidden(True)

    PoseReaderNode.addAttribute(PoseReaderNode.coneTarget)

    nMatrixAttr = om.MFnMatrixAttribute()

    PoseReaderNode.coneAperture = nMatrixAttr.create("coneAperture","aperture", om.MFnMatrixAttribute.kDouble)

    nMatrixAttr.setWritable(True)

    nMatrixAttr.setHidden(True)

    PoseReaderNode.addAttribute(PoseReaderNode.coneAperture)

    PoseReaderNode.attributeAffects(PoseReaderNode.coneTarget, PoseReaderNode.distance)

    PoseReaderNode.attributeAffects(PoseReaderNode.coneRadius, PoseReaderNode.distance)

    PoseReaderNode.attributeAffects(PoseReaderNode.coneAperture, PoseReaderNode.distance) 

 

def initializePlugin(obj):

    plugin = OpenMayaMPx.MFnPlugin(obj, 'AnimaPoseReader', '0.1', 'macka')

    try:

        plugin.registerNode('AnimaPoseReader', PoseReaderNode.kPluginNodeId, creator, initialize)

    except:

        raise RuntimeError, 'initialization fail'

 

def uninitializePlugin(obj):

    plugin = OpenMayaMPx.MFnPlugin(obj)

    try:

        plugin.deregisterNode(PoseReaderNode.kPluginNodeId)

    except:

        raise RuntimeError, 'not unloading!'

I thought about the attributeAffects, but commenting those lines works the same (crappy)

Any idea about that would be really welcome guys, I really don't know where to look at my code.

[Paul Molodowitch]

My advice - get a python debugger that allows you to attach to a process, and see what it's actually doing. I personally use eclipse / pydev's debugger for this (about the only thing I still use eclipse for these days), and it's extremely helpful.  PyCharm apparently has this feature now as well, though I've found it's debugger buggier / less reliable than PyDev's in the past, so I haven't tried it out yet.  I'm sure there are many other options as well.

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