SC2Mapster

@Mesden: Go

How about using a Upgrade, that enables the Ability? And then add a requirement to the Ability that the Upgrade must be researched.
Reasearching a Upgrade can be done by triggers.

The Event will not fire when you convert a Preset into an Unit as third Parameter (tested it out). Let's see, if there's an other event, that would work...

Edit:
Found nothing that would do the job, but you can use a hardcore (baaad) Variant:
Use a periodic Timer Event, that checks if Any Unit of Player 1 is in Range of Any Unit of Player 2...
Not pretty, but functional.

@copperfront: Go

Would be much easier. Do it like gorang said, but use the player as index in the array (players ar represented as integer in sc2)

Player_Spawnregion = No Region <Region[4]>

Buy Marine
    Events
        Unit - Any Unit Enters Buy Marine
    Local Variables
    Conditions
        (Number of Living units in (Any units in Buy Marine owned by player (Triggering player) matching Excluded: Missile, Dead, Hidden, with at most Any Amount)) == 3
    Actions
        Unit Group - Pick each unit in (Any units in Buy Marine owned by player (Triggering player) matching Excluded: Missile, Dead, Hidden, with at most Any Amount) and do (Actions)
            Actions
                Unit - Kill (Picked unit)
                Unit - Create 1 Marine > 3 for player (Triggering player) at (Center of Player_Spawnregion [(Triggering player)]) facing 270.0 degrees (No Options)

Don't forget to initialize the region array with yout player regions...

Cheers Then

@anteevy: Go

I've seen a explanation how those Multi-Variation Models work: http://forums.sc2mapster.com/development/map-development/2614-multiple-models-for-1-unit-o_o/#p3

But for your Problem:

1. Create a new Model for your Actor.
2. Set the Model-Property of this Model (damn names) to the specific Modelfile you want to use.
3. Set the Model-Property of your Actor to your created Model.
4. done.

I've tried this myself with a Hero that used one of the Colonist Models... Hope this helps you.

Cheers Then

@ItsPawl: Go

Thanks a lot! I figured out that it was even enough to set the unit flag Buried to enable for removing the glow.

I'm trying this in the opposite way: what to have cloak without that glow. Any ideas?

@ItsPawl: Go

Tried same with Nova's Cloak but, like I said before, it didn't work...

@Fellius: Go

Thought so. That would hide the Unit for all because this action is synchronously done by all player.

Hey everyone out there!

Since days I stick with a problem: I want to create a Actor or Unit wich is only visible to a single Player.

Tried to do do it with the Actor-Filter Property but this done nothing. Setting Actor's Model to Invisible via Catalog Field Value (with a Trigger) thrown an error (CatalogFieldNotSet or something like that). Cloaking the Unit has done Invisibility, but then the unit hat this blue Glow and thats not what I wanted. Haven't found a Actor Event wich would do the job...

Anybody an Idea for this? Thanks for helping... Cheers