On Thu, Sep 25, 2008 at 7:16 AM, Mario Dubec <[EMAIL PROTECTED]> wrote:
> Ok, i will try that if statement at the beginning.
>
> It crashes either:
> 1. when i plug anything into it, correct or incorrect does not matter
> 2. when I have plugin loaded and try to create new scene in current Maya
> session
No, I meant at what point in your compute() method does it crash. You
have a print statement at each stage. What's the last one to be
displayed before it crashes?
> By moving it to connection methods, should I call them at the beginning of
> compute? Or return some status from them? (like unknown parameter) Never
> used those :( I am quite new to API :(
You don't need to call the connection methods at all. Maya will call
them whenever a connection is made to your node or broken. So you'd
want something like this:
import maya.OpenMaya as om
import maya.OpenMayaFX as omfx
class myNode(om.MPxNode):
particleNode = om.MObject() # to hold particleNode
attr
fluidNode = om.MObject() # to hold fluidNode attr
debugMe = om.MObject() # to hold debugMe attr
def __init__(self):
self.particleNodeValid = False
self.fluidNodeValid = False
ompx.MPxNode.__init__(self)
def connectionMade(self, myPlug, otherPlug, iAmSrc):
if not iAmSrc:
if myPlug == myNode.particleNode:
otherNode = otherPlug.node()
# If the connection is to a particle
node, mark it valid.
if otherNode.hasFn(om.MFn.kParticle):
self.particleNodeIsValid = True
self.particleNodeFn =
omfx.MFnParticleSystem(otherNode)
else:
self.particleNodeIsValid = False
self.particleNodeFn = None
elif myPlug == myNode.fluidNode:
otherNode = otherPlug.node()
# If the connection is to a fluid node,
mark it valid.
if otherNode.hasFn(om.MFn.kFluid):
self.fluidNodeIsValid = True
self.fluidNodeFn =
omfx.MFnFluid(otherNode)
else:
self.fluidNodeIsValid = False
self.fluidNodeFn = None
def connectionBroken(self, myPlug, otherPlug, iWasSrc):
if not iWasSrc:
if myPlug == myNode.particleNode:
self.particleNodeIsValid = False
self.particleNodeFn = None
elif myPlug == myNode.fluidNode:
self.fluidNodeIsValid = False
self.fluidNodeFn = None
def compute(self, plug, block):
if plug == myNode.debugMe:
if self.particleNodeIsValid and
self.fluidNodeIsValid:
result = "both connected"
elif self.particleNodeIsValid:
result = "particle connected"
elif self.fluidNodeIsValid:
result = "fluid connected"
else
result = "neither connected"
block.outputValue(myNode.debugMe).setString(result)
return om.MStatus.kSuccess
# This is not an attribute that I recognize, so let
Maya know that
it should handle it.
return om.MStatus.kUnknownParameter
So you use connectionMade and connectionBroken to maintain a pair of
flags indicating which connections are currently valid. I've also got
them creating the corresponding function sets so that they'll be ready
for compute() to use when its needs them. If you find that it's still
crashing then try having compute() create the functionsets for itself.
The compute() simply checks the flags to see what's valid and takes
action based on that.
--
-deane
--~--~---------~--~----~------------~-------~--~----~
Yours,
Maya-Python Club Team.
-~----------~----~----~----~------~----~------~--~---
