I've been wondering this for a couple years now. So now I will ask, how does this work and can I reproduce it? I assume someone will say, its something to do with engine and not something I can do.

trig waittill("trigger", player);
//player becomes the player that triggered it
self waittill( "damage", amount, attacker, directionVec, point, type ); 
//All of these vars are ?returned?

Can I make a custom function do this and how?

waittill is what I call a "special" function. It doesn't act like any normal function, whatever you put in as an argument actually becomes a defined variable. You can do

ent notify( "string", trigger );

and somewhere else you can do

ent waittill( "string", trigger );

and 'trigger' will automatically be a defined variable, defined as the trigger you passed on in the 'notify' in the other function. You don't even have to add

trigger = undefined;

above it. It just works. This has proven super useful to me.

But i can't make a new "special function" can I?

I have a waittill trigger function that doesn't use triggers, that would be great if I could get to work like the normal one.

No you cannot make your own. For something like that though, I would recommend using

struct = SpawnStruct();

to have something to notify on and be saved as the 'trigger' in your system. For those who are unclear, structs do NOT cound towards g_spawn, you cannot even delete them.

No you cannot make your own. For something like that though, I would recommend using

struct = SpawnStruct();

to have something to notify on and be saved as the 'trigger' in your system. For those who are unclear, structs do NOT cound towards g_spawn, you cannot even delete them.

Lol, yup, that is one of the methods, but I usually just use the ent itself. Okay, thanks for confirming that I can't reproduce it.