[Closed] face selection change callback

Dec 23, 2008 2:32 pm

Hey everybody!

I’m working on a script that offers a smoothing-group-like UI for material IDs. As in: loads of small button, one per ID.

For this I need a a function that highlights the buttons according to the material IDs of the selected faces.
Do you know a good callback/change handler that can do this?
I tried ‘when geometry changes’, but it doesn’t get called on selection change.

Thanks and merry christmas!

2 Replies

ZeBoxx2

Dec 23, 2008 2:32 pm

You can either use the “when select” changeHandler, or use the Node Event System (3ds Max 2009) which has a subObjectSelectionChanged callback function parameter.

Note that the “when select” changeHandler also triggers on standard node selection/deselection, so it’s up to you to filter those out and only worry about subObject-level selection changes.

Edit: example for meshes


myObj = $
oldFaceSelectionCount = ((myObj.selectedFaces as bitArray) as array).count
deleteAllChangeHandlers id:#test
when select myObj changes id:#test do (
	newFaceSelection = myObj.selectedFaces as bitArray
	newFaceSelectionCount = (newFaceSelection as array).count
	if (newFaceSelectionCount != oldFaceSelectionCount) then (
		oldFaceSelectionCount = newFaceSelectionCount
		matIDs = #()
		for i in newFaceSelection do (
			appendIfUnique matIDs (getFaceMatID myObj i)
		)
		print matIDs #nomap
	)
)

harefort

Dec 23, 2008 2:32 pm

Works like a charm.
Thanks!