Hi Carlos,
Dependency Nodes are basically (once created) like other dependency nodes
in Maya. So, you can (once the plugin is loaded, either through script or
through the plugins manager) call createNode('<your plugin's node name>"),
which will create your node, and then you just connect and/or set attrs on
that node. It's identical to, say, a multiplyDivide node or a
plusMinusAverage.
Hope that helps,
Joe
On Tue, Jan 13, 2015 at 1:32 AM, Carlos Montes <[email protected]>
wrote:
> Hello, everyone. I have just finished Robert Galanakis' "*Practical Maya
> Programming with Python*" book, where in its Chapter 8 a dependency graph
> plug-in is developed. My problem is, I don't know how it can be used or
> invoked inside Maya; using plug-ins for this software is new for me. I will
> provide some code from the book to try to expose where my doubtfulness
> resides, but the question remains the
>
> In Chapter 7, he teaches us a* Command plug-in* can be called with
> pymel.core's loadPlugin in the Script Editor, and then a plugin_name
> variable that was defined inside the Python plugin file can be used as a
> method that invokes the plugin.
>
> This is what it would look like in the Script Editor's Python tab, for a
> Command plug-in to be used :
>
> import pymel.core as pmc
> pmc.loadPlugin('playsoundplugin.py')
> pmc.playSound()
>
> Inside 'playsoundplugin.py', that variable called plugin_name is defined
> as the method you invoke to play a Sound in Maya, by using a creator
> function and initializing the plugin with registerCommand.
>
> plugin_name = 'playSound'
>
> def create_plugin():
> return OpenMayaMPx.asMPxPtr(SoundPlayer())
>
> def initializePlugin(mobject):
> plugin = OpenMayaMPx.MFnPlugin(mobject)
> plugin.registerCommand(plugin_name, create_plugin)
>
> It's very straightforward, and it all makes sense with has been taught in
> the book; he even offers a very interesting way to add flags to the command
> call.
> For Chapter 8, though, he doesn't show how we can use the quite complex
> *Dependency
> Node plugin* where he creates a node and its attributes with
> specifications and concrete subclasses. The plugin takes three input
> values, and a compute function takes care of determining two output
> attributes.
>
> Similar to the Command plugin creation, the node plugin also uses similar
> creator and initialization functions; but this time, a new type with the
> 'circler' name is created:
>
> def register_circler(fnplugin):
> inputnames = ['input', 'scale', 'frames']
> reg, dereg = create_node(NT_DEPENDSNODE, 'circler', 0x60005, [ value1,
> value2, value3 ])
> reg(fnplugin)
>
> def initializePlugin(mobject):
> register_circler(OpenMayaMPx.MFnPlugin(mobject))
>
> And here is where my question is; Command plug-ins can be called with the
> plugin_name variable, but how can I use a Dependency Node plugin then? How
> can I create this dependency node with input and output attributes inside
> Maya? Do all Dependency Node plugins share the same procedure to be used?
>
> I hope the question is not too vague or non understandable. Thank you for
> reading.
>
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