MGlobal global operation function
MGlobal
Function: a static class that provides general API functions
Features: no need to instantiate, you can use static methods directly
We can use its methods to do some functions that are not particularly targeted, but are just public. His methods are static methods, and we can call them directly.
1. First we import MGlobal in maya.OpenMaya
from maya.OpenMaya import MGlobal2. You can use apiVersion to get his api version
from maya.OpenMaya import MGlobal
MGlobal.apiVersion()
3. We want to get the selected objects in the scene, similar to our ls command
This command will store the content of our current selection in this sel. If an object is selected as shown in the figure, there is one element in the list of MSelection.
from maya.OpenMaya import MGlobal
sel = OpenMaya.MSelectionList()
OpenMaya.MGlobal.getActiveSelectionList(sel)
sel.length()
4. We can setActiveSelectionList(), direct selection of objects is equivalent to our selection command, which is similar to select followed by a group of lists, which contains the names of a group of objects.
from maya.OpenMaya import MGlobal
sel = OpenMaya.MSelectionList()
OpenMaya.MGlobal.getActiveSelectionList(sel)
OpenMaya.MGlobal.setActiveSelectionList(sel)
5. We can also use it to execute a python command, such as OpenMaya.MGlobal.excuteCommand("createNode'joint'")
There is no output result by default, so we need to use a variable to accept the output result
If sometimes our plug-in needs to call her original commands, we can call these things in AP. In the API, we can use excuteCommand followed by MEL or Python commands, then call the python command. For excutePythonCommand, we can also use it to judge the state in the scene.
For example, to determine whether the Y axis is up or the Z axis is up, return a bool value
Use it to display part of the information, display output warning or error information, you can use displayInfo
Display normal prompt information: OpenMaya.MGlobal.displayInfo('info msg.....')
Display warning message: OpenMaya.MGlobal.displayWarning('info msg.....')
Display error message: OpenMaya.MGlobal.displayError('info msg.....')
Change the position of the frame: OpenMaya.MGlobal.viewFrame(30)