[Maya-Python] Custom Manipulator

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Marcus Ottosson

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Jun 2, 2018, 2:24:45 PM6/2/18
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Hi all,

I’m scratching my head over trying to get a manipulator to influence an attribute.

For example, I’ve got a composeMatrix node with an .inputTranslate attribute that I’d like to add a manipulator for.


I’ve been looking at the MFnFreePointTriadManip which has got a .connectToPointPlug() method taking an MPlug. 

from maya.api import OpenMaya as om, OpenMayaUI as omui

composeMatrix = cmds.createNode("composeMatrix")
msel = om.MSelectionList()
msel.add(composeMatrix)
mobj = msel.getDependNode(0)
fn = om.MFnDependencyNode(mobj)
mplug = fn.findPlug("inputTranslate", False)

fn = omui.MFnFreePointTriadManip()
fn.connectToPointPlug(mplug)

# Error: (kFailure): Object does not exist
# Traceback (most recent call last):
#   File "<maya console>", line 2, in <module>
# RuntimeError: (kFailure): Object does not exist #

This happens for both API 1.0 and 2.0.

My understanding is that this function set is only usable during the creation of a plug-in, is that right? If so, is there any way of using this, or anything like it, to instantiate a custom manipulator “on-demand”, for a native Maya node and attribute such as composeMatrix.inputTranslate?

​

Serguei Kalentchouk

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Jun 2, 2018, 5:42:55 PM6/2/18
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Hey Marcus,

Not sure if creating manipulator outside of the relevant plugin callback is even valid but besides that, in your example  omui.MFnFreePointTriadManip() is just a function set that is not bound to to any actual maya object hence the error.


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Marcus Ottosson

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Jun 2, 2018, 6:07:33 PM6/2/18
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omui.MFnFreePointTriadManip() is just a function set that is not bound to to any actual maya object hence the error.

I figure maybe it’d work like the function sets for other things.

from maya.api import OpenMaya as
 om

fn = om.MFnDependencyNode()
mobj = fn.create("composeMatrix")

Especially as it also has a .create() method. But alas, it does not seem to be the case.

What other ways are there? Could it be a placeholder plug-in (like we did for undo)? What I’m looking for is just a manipulator for an attribute that normally does not have one.

​

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Joe Weidenbach

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Jun 2, 2018, 7:58:27 PM6/2/18
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Hey Marcus,

I’ve not done it myself (yet), but I believe that what you’re looking for is a custom context. This context can be set up (through MMessages) to become active on selection of specific nodes, and then it can assign/control the necessary manipulators:

Basically you’d implement a MPxContext that handles the clicks to send commands to your manipulator, then a MPXContextCommand to create the context and add the manipulators, and finally set up an MMessage Handler (or a scriptjob in the userSetup.py) to call your context command to set things up.  The other option (potentially, again, haven't tried, but just looking at the docs) is to create a custom selection context (using MPxSelectionContext) and set things up to use it instead of the default selection context (probably through hacking the base scripts).

Maya API: MPxContext

Hope that at least points you in the right direction,

Joe

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Marcus Ottosson

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Jun 3, 2018, 4:14:45 AM6/3/18
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Thanks Joe! Investigating those next.

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