[JASS] Question on CollisionMissile_Create

[Big Dub]

I was looking through JassCraft when I found this:

function CollisionMissile_Create takes string MissileModelPath, real x, real y, real dirangle, real speed, real AngleSpeed, real MaxDist,  real height, boolean UseNewCaster, real Collision, code OnImpact returns unit
 local timer t
 local gamecache H=CSCache()
 local string k
 local integer ki
 local trigger R
 local group g
 local unit m

    if (HaveStoredInteger(H,"CasterSystem","MOVEMENT_TIMER")) then
        set g=GetTableGroup("CasterSystem","MOVEMENT_GROUP")
    else
        set t=CreateTimer()
        set g=CreateGroup()
        call SetTableObject("CasterSystem","MOVEMENT_TIMER",t)
        call SetTableObject("CasterSystem","MOVEMENT_GROUP",g)
        call TimerStart(t,CS_Cycle(),true,function CasterSystemMovementTimer)
    endif
    set ki=NewTableIndex()
    set k=I2S(ki)



    if UseNewCaster then
        set m=AddCasterFacing(dirangle)
        call StoreBoolean(H,k,"new",true)
    else
        set m=GetACaster()
        call SetUnitFacing(m,dirangle)
    endif
    call StoreInteger(H,"MOVEMENT_TABLES",GetAttachmentTable(m),ki)
    call StoreBoolean(H,k,"IsCollisionMissile",true)

    call SetUnitPosition(m,x,y)
    call StoreReal(H,k,"speed",speed)
    call StoreReal(H,k,"aspeed",AngleSpeed)
    call StoreReal(H,k,"F",dirangle)
    call StoreReal(H,k,"maxd",MaxDist)
    call SetUnitFlyHeight(m,height,0)



    call GroupAddUnit(g,m)

    set R=CreateTrigger()
    call AttachObject(R,"m",m)
    call StoreReal(H,k,"collision",Collision)
    call SetTableObject(k,"T",R)
    call StoreInteger(H,"MOVEMENT_TABLES",GetAttachmentTable(R),ki)
    call SetTableObject(k,"fx", AddSpecialEffectTarget(MissileModelPath,m,"origin") )
    call SetTableObject(k,"m",m)
    call SetTableObject(k,"ac",TriggerAddAction(R,OnImpact))

 set t=null
 set g=null
 set R=null
 set udg_currentcaster=m
 set m=null
 set H=null
 return udg_currentcaster
endfunction

What does it do?
And if it does what I think it does how do you use it?

 

[Big Dub]

Nobody knows what this thingy is?

 

[GhostWolf]

Lmao, JassCraft has functions for Vexorian's Caster system built it? that's propaganda

Anyhow, like I said, Caster system is a bunch of code written by Vexorian. Never used it so I can't really say more.