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Ive been getting further into items and models. And ive noticed that some units in custom games are multiple models that are put into one actor. or something like that. For example, theres a game called battlecraft on starcraft 2 arcade, and theres a hero called the uberlisk. This unit is a massive ultralisk but with 6 spine crawlers on its back. How can someone do this? I would like to know.
The basic mechanism is that the spine crawler models are created in the actor events of the actor for the uberlisk, whose main model is an ultralisk. Thus the spine crawlers are "attached" to the ultralisk model. They're not actual spine crawler units, in case there was any confusion there.
The use of host site operations causes the spines to attach to the right points on the ultralisk model, and some events in the uberlisk's main actor using references and signaling tell the spines when to animate. The Leviathan from the campaign actually uses the same tricks for its spine tentacles, and is easily accessed for reverse-engineering if you have that kind of mind. It might be good to look over the spine crawler attack actors first though, because there's some fairly unique stuff involved in these tentacle attacks that has nothing to do with the multi-modelness of the units.
If you're not big on reverse-engineering, try googling "sc2 uberlisk tutorial" or similar terms. The uberlisk is actually pretty widely known and not unique to battlecraft, and, without clicking any links, it appears that such a search is pretty fruitful.
There are probably a few ways to get some of the results here, so don't get mad if you find a tutorial that doesn't use quite what I described.
The Uberlisk is an extremely complex unit to create. I suggest you start with something smaller.
Here's a link to Beginner's Attachment Guide by ProzaicMuze:
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