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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