Adding Scripted modifier

[ztravnicky]

Having this script in scripts/startup (script.ms file)

plugin modifier modifier_B
name:"B"
classID:(genClassID returnValue:true)
(
	rollout b "TestB"(
		button btnB "ADD A"
		
		fn addA obj = (
			addmodifier obj (modifier_A())
		)
		
		on btnB pressed do (
			for o in objects do (
				addA o 
			)
		)
	)
)

plugin modifier modifier_A
name:"A"
classID:(genClassID returnValue:true)
(
	rollout ra "TestA"(
		button btnA "OK"
		
		on btnA pressed do (
			print "Modifier A"
		)
	)
)

When hitting buton "TestB" is causing an error (undefined modifier), even the modifiers should be global! Changing the order will fix this error. Why is this happening? Is it BUG with the chance to be fixed soon? It behaves the same way in all version of MAX.

[Steve_Curley]

Modifier_A is undefined as far as modifier_B is concerned, or rather it's not defined within the rollout code. You need a "forward reference".
See http://help.autodesk.com/view/3DSMAX/2015/ENU/?guid=__files_GUID_608825CD_D025_4054_91E2_2562A6AB31C...

[ztravnicky]

I'm sorry, but this code is not giving success... Am I missing something?

plugin modifier modifier_B
name:"B"
classID:(genClassID returnValue:true)
(
	local modifier_A
	
	rollout b "TestB"(		
		button btnB "ADD A"
		
		fn addA obj = (
			addmodifier obj (modifier_A())
		)
		
		on btnB pressed do (
			for o in objects do (
				addA o 
			)
		)
	)
)

plugin modifier modifier_A
name:"A"
classID:(genClassID returnValue:true)
(
	rollout ra "TestA"(
		button btnA "OK"
		
		on btnA pressed do (
			print "Modifier A"
		)
	)
)

[Steve_Curley]

Try putting it inside the rollout, after the rollout b "TestB"( line.

[ztravnicky]

I already did...

Did you try and it worked for you?

[Steve_Curley]

Nope, because I've not played with that kind of scripting before, but almost every error of that kind is pretty much always down to not following the info on the linked page exactly. Almost guaranteed - and there's rollout code in your example...

[Steve_Curley]

Ok, took a while to understand what's going on here.
The "forward declaration" does need to be inside the rollout code, but because both modifiers are being created globally the declaration has to be "global" not "local".

Also, I think you should change both of the classID statements to be actual class IDs not random ones. Having them random will cause errors if you execute the script twice because you'll get "Runtime error: Plugin redefinition: Cannot change ClassID".