Ian, you rock!
OpenMaya.MFileIO.isReadingFile() handles all the cases that I need (open,
reference, import) and OpenMaya.MDGMessage.addNodeAddedCallback() accepts
an explicit node type as a second argument, so the callback system won't
call my script to inspect every single node. Great! The only remaining
minor gotcha is that duplicating a node of this type will change the
attributes, but thats something the users can probably live with.
Thanks a lot!
Cheers,
Szabolcs
Just for the archives:
--
import maya.OpenMaya as OpenMaya
import maya.cmds as cmds
def nodeCreationCB(node, info):
if OpenMaya.MFileIO.isReadingFile():
return
mayaNodeName = OpenMaya.MFnDependencyNode(node).name()
cmds.setAttr(mayaNodeName + '.attr', 1)
cbid = OpenMaya.MDGMessage.addNodeAddedCallback(nodeCreationCB,
'myNodeType')
--
On Thursday, March 30, 2017 at 4:26:18 PM UTC+2, Ian Waters wrote:
>
> Hey,
> You can run that check without a callback:
>
> from maya import OpenMaya as om
>
> if not om.MFileIO.isReadingFile():
> change some stuff...
>
> That would avoid callback spaghetti :)
> Best,
> Ian
>
> On 30 Mar 2017, at 12:20, Szabolcs <[email protected] <javascript:>>
> wrote:
>
> Hi,
>
> I'd like to change the default attribute values of a certain node type,
> but because of an existing asset library I can't simply change the defaults
> in the plugin, because that would break existing Maya scenes. I tried using
> OpenMaya.MDGMessage.addNodeAddedCallback() to setup a callback to change
> the attributes after node creation and it works ok, but the problem is that
> the callback executes not only when a new node is created by hand (or
> script) but also when a scene file is loaded / imported / referenced. I
> could disable the callback for scene load using another callback (yuck!)
> but it sounds like its leading into a mess of callbacks fighting with each
> other. I'm also not super happy about having a callback that examines the
> node type of every created node either, I'm afraid that it would slow down
> some scripts.
>
> So the question is: is there a bulletproof solution for doing something
> like this? Or are there any tricks to check the reason of the
> addNodeAddedCallback being called? Or should I simply hijack createNode and
> shadingNode commands and wrap them into custom code (for both mel and
> python)? Any suggestion is much appreciated!
>
> Cheers,
> Szabolcs
>
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