Quake Hack tech notes
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Description
All sub-models _must_ load during worldspawn!
You can load a hack chunk with a copy of the sub-model as many times as you desire.
As long as it was loaded during worldspawn.
My solution - load one of every hack on the base map
Sub-models are doors, plats, func_wall, etc.
Any entity that uses map brush for its model.
If you have a hack chunk with a sub-model that wasnt cached during worldspawn, it will end up invisible and / or possibly do weird stuff.