Hello, everyone. I have just finished Robert Galanakis' "*Practical Maya
Programming with Python*" book, where in its Chapter 8 a Dependency Graph
plugin is developed. My problem is, I don't know how it can be used or
invoked inside Maya; using plugins 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 questions basically reside at the bottom of this post.
In Chapter 7, he teaches us a* Command plugin* 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 plugin 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
Graph 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 Graph 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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