main local.trigorigin local.soundorigin local.targetname local.name local.horn local.setsize1 local.setsize2:

	local.trig = spawn trigger_use
	local.trig.origin = local.trigorigin
	if(local.setsize1 == NIL || local.setsize2 == NIL) { local.trig setsize ( -30 -30 -30 ) ( 30 30 30 ) }
	if(local.setsize1 != NIL && local.setsize2 != NIL) { local.trig setsize local.setsize1 local.setsize2 }
	local.trig setthread engine_onoff_horn

	local.trig.engine = 0 // holds the truck trigger's current state (engine off/on: 0 or 1).
	local.trig.horn = local.horn // 0 = no horn, 1 = honk while vehicle is on only, 2 = honk while on or off
	local.trig.name = local.name // some vehicles (tanks, planes, halftracks) do not have horns.
	local.trig.targetname = local.targetname

	local.engine = spawn script_model targetname (local.targetname)
	local.engine model "static/indycrate.tik" // need a model for script_models to do "loopsound".
	local.engine.origin = local.soundorigin 
	local.engine notsolid
	local.engine.scale = 0.001
	//local.engine hide // loopsound does not work if script_model is hidden; use .scale = 0.001 instead.
	
end

engine_onoff_horn:

	local.player = parm.other
	local.team = local.player.dmteam // dmteam checks probably not needed, but helps prevent triggering if player changes team or goes to spectator.
	
	local.holdtimer = 0
	while(local.player.useheld == 1 && local.player.dmteam == local.team && isalive local.player)
	{ 
		if(local.holdtimer == 0) 
		{ 
			local.player stopwatch 3 // begin counting when USE key is held.
		}
		if(local.holdtimer >= 60) // 20 loops/sec * 3 seconds = 60.
		{  
			local.player stopwatch 0

			if(self.engine == 0) 
			{ 
				local.player iprint (self.name + " has turned on.")
				$(self.targetname) playsound (self.name + "_ignitionstart")
				wait 1
				$(self.targetname) loopsound (self.name + "_idleloop")
			}
			if(self.engine == 1) 
			{ 
				local.player iprint (self.name + " has turned off.")
				$(self.targetname) stoploopsound
				$(self.targetname) playsound (self.name + "_ignitionstop")
				wait 1
			}
			self.engine++
			if(self.engine > 1) { self.engine = 0 }

			end
		}
									      
		local.holdtimer++
		local.team = local.player.dmteam // if player is still alive, then make player's dmteam = local.team.
		wait 0.05 // 20 while-loop increments per second.
	}

	if((self.engine == 1 || self.horn == 2) && local.holdtimer <= 20 && self.horn != 0) // if player releases USE key within 1 second while engine is on, or while off if self.horn = 2
	{ 
		local.player iprint ("Honking the " + self.name + " horn.") 
		$(self.targetname) playsound truckhorn
	}

	local.player stopwatch 0

	if(self.engine == 0 && self.horn != 2) { local.player iprint ("Hold USE for 3 seconds to turn on the " + self.name) }
	if(self.engine == 0 && self.horn == 2 && local.holdtimer > 20) { local.player iprint ("Hold USE for 3 seconds to turn on the " + self.name + ", or hold USE for 1 second to honk the horn.") }
	if(self.engine == 1 && self.horn != 0 && local.holdtimer > 20) { local.player iprint ("Hold USE for 3 seconds to turn off the " + self.name + ", or hold USE for 1 second to honk the horn.") }
	if(self.engine == 1 && self.horn == 0) { local.player iprint ("Hold USE for 3 seconds to turn off the " + self.name) }
end