Retaining velocity for a spawned... spawner

[Grey_Wolf]

TNT1 A 0 A_print("Hello world! Yes, it's me. AGAIN")

 

I got a lootable closed chest up and working and now I'm writing the loot spawners for when it is opened by the player:

Spoiler

ACTOR OpenCrate
{
  +FloorClip
  Scale 0.5
  States
  {
  Spawn:
  CHOP A 1
  CHOP A 1 A_SpawnItemEx("Armorloot",0,0,0,1,-2,8)
  CHOP A 1 A_SpawnItemEx("Ammoloot",0,0,0,1,2,8)
  CHOP A 1 A_SpawnItemEx("Healingloot",0,0,0,1,0,8)
 
  Rest:
  CHOP A 1
  loop
  }

Now, here's the catch: each one of the "loot" objects is a random spawner that picks between different items of the same type (of course armor, ammo, and healing items). Since this is just a prototype (there will be more spawn states with more loot combinations of three) and I want them to be randomized, I want those items to retain the velocity of the "loot" spawner actors written above, so the loot won't clip with itself and the three categories always pop up  in those 3 directions. Is it possible?

 

Edit: maybe a pointer with change_velocity? But how can I get the spawner point to the loot item?

Edited February 10, 2019 by Grey_Wolf

[Grey_Wolf]

For anyone wondering, I managed to solve it making the closed chest acquire the player as its target and then facing it, before spawning the items.

 

Thank you very much for the time you spent answering me.

But I'll be back. I'm always back.

[ketmar]

there are `velx`/`vely`/`velz` decorate variables that holds current item velocity. so you can pass them to `A_SpawnItemEx()` in your loot spawner. i.e. spawn loot spawner with the required velocities, and use `A_SpawnItemEx("RealLoot",0,0,0,velx,vely,velz)` in it to spawn a real loot.

[ketmar]

that is what i wrote (if i got you right). you spawned your spawner with some velocity, and then from inside the spawned spawner you can spawn a real loot, passing current spawner's velocity to that real loot. so the chain is:

spawn spawner -> spawner spawns loot with `vel[xyz]` and dies -> loot is flying away with spawners velocity

[ketmar]

note that velocity is relative to the parents velocity by default. there is `SXF_ABSOLUTEVELOCITY` flag to make it absolute. that is, with your code, `vel[xyz]` is added to spawner's velocity, and it causes chaos.

 

also note that just using (0,0,0) as velocity will not work as expected: it actually changes velocity according to spawner's angle -- that's why you need both to specify velocity manually, and use `SXF_ABSOLUTEVELOCITY` flag.

 

p.s.: i forgot about that too in my example. sorry.

[ketmar]

as far as i remember, replacing actual loot spawns in spawner, i.e.:

A_SpawnItemEx("ArmorBoots",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)

with

A_SpawnItemEx("ArmorBoots",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)

(and other instances) should do the trick.

 

at least this is what source code for a port tells me. hope it will work as expected. ;-)

 

 

10 minutes ago, Grey_Wolf said:

sorry if I'm bothering you for so long

no problems, we're both here to make it finally work (and to create something other people may refer to). ;-)

 

p.s.: please note `0` after velocities! there is `angle` argument before `flags`!

[Grey_Wolf]

Ok it's either me that I didn't understand correctly or you that didn't look at the code I posted under spoilers.

I already set the spawner velocity, but i want the items spawned from it to retain the same velocity as the spawner.

[Grey_Wolf]

Ok now I did understand what you meant. But something seems off:

 

This is my prototype for the open chest:

Spoiler

ACTOR OpenCrate
{
  +FloorClip
  Scale 0.5
  States
  {
  Spawn:
  CHOP A 1
  CHOP A 1 A_SpawnItemEx("Armorloot",0,0,0,2,-3,10)
  CHOP A 1 A_SpawnItemEx("Healloot",0,0,0,2,3,10)
 
  Rest:
  CHOP A 1
  loop
  }
}

 And these are the first two types of spawners:

Spoiler

actor ArmorLoot : CustomInventory
{
    +Inventory.QUIET
    States
    {

     Spawn:
        TNT1 A 0
        TNT1 A 0 A_jump(255, "Spawn1", "Spawn2", "Spawn3", "Spawn4", "Spawn5", "Spawn6")
        loop
        
    Vanilla:    
    Spawn1:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("ArmorBoots",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop
    
     Spawn2:
        TNT1 A 0
        TNT1 A 0 A_SpawnItemEx("ArmorHelmet",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop
        
    Spawn3:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("ArmorUniform",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40,"Spawn")
        TNT1 A 1
        Stop    
        
    Spawn4:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("MediumArmor",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop    
    
    Spawn5:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("HeavyArmorBelt",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop
    
    Spawn6:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Armorbonus",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Stop    
    

}}

actor Healloot : CustomInventory
{
    +Inventory.QUIET
    States
    {

     Spawn:
        TNT1 A 0
        TNT1 A 0 A_jump(255, "Spawn1", "Spawn2", "Spawn3", "Spawn4", "Spawn5", "Spawn6")
        loop
        
    Vanilla:    
    Spawn1:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("medikit2",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop
    
     Spawn2:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("stimpack2",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(80, "Spawn")
        TNT1 A 1
        Stop
        
    Spawn3:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("Healthbackpack",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40,"Spawn")
        TNT1 A 1
        Stop    
        
    Spawn4:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("PackMedikit",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Stop    
    
    Spawn5:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Healthbonus",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Stop
    
    Spawn6:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Bandages",0,0,0,velx,vely,velz,SXF_NOCHECKPOSITION)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Stop    
    

}}

 

when i open the chest the items actually spawn, BUT:

-Sometimes they spawn with the right velocity

-Sometimes they just retain vertical velocity but stay in place.

-Sometimes they spawn behind the chest insted of in front of it (wrong xvelocity direction)
 

Looks like the vel(x,y,z) is randomizing velocity rather than retaining it. But the vertical velocity always look to be the same.

Could be this related to the spawner's angle?

[Grey_Wolf]

So wait, and sorry if I'm bothering you for so long, but should I put SXF_ABSOLUTEVELOCITY on the spawner or on the spawned items? And where should I manually write velocity values? Can you give me a small practical example? Thanks again for your patience.

[Grey_Wolf]

Still no luck sadly...
These are the updated crate and spawner codes:

CRATE:

Spoiler

ACTOR OpenCrate
{
  +FloorClip
  Scale 0.5
  States
  {
  Spawn:
    CHOP A 1
     CHOP A 1 A_JumpifCloser(100,"See")
    Goto see
  See:
    CHOP A 1 A_Facetarget
    CHOP A 5
    CHOP A 1 A_SpawnItemEx("Armorloot",0,0,0,2,-3,10,0)
    CHOP A 1 A_SpawnItemEx("Healloot",0,0,0,2,3,10,0)
    goto rest
   Rest:
    CHOP A 1
    loop
  }
}

SPAWNERS:

Spoiler

actor ArmorLoot : CustomInventory
{
    States
    {

     Spawn:
        TNT1 A 0
        TNT1 A 0 A_jump(255, "Spawn1", "Spawn2", "Spawn3", "Spawn4", "Spawn5", "Spawn6")
        loop
        
    Vanilla:    
    Spawn1:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("ArmorBoots",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Wait
    
     Spawn2:
        TNT1 A 0
        TNT1 A 0 A_SpawnItemEx("ArmorHelmet",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Wait
        
    Spawn3:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("ArmorUniform",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(40,"Spawn")
        TNT1 A 1
        Wait    
        
    Spawn4:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("MediumArmor",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(20, "Spawn")
        TNT1 A 1
        Wait    
    
    Spawn5:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("HeavyArmorBelt",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(20, "Spawn")
        TNT1 A 1
        Wait
    
    Spawn6:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Armorbonus",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Wait    
    

}}

actor Healloot : CustomInventory
{
    +Inventory.QUIET
    States
    {

     Spawn:
        TNT1 A 0
        TNT1 A 0 A_jump(255, "Spawn1", "Spawn2", "Spawn3", "Spawn4", "Spawn5", "Spawn6")
        loop
        
    Vanilla:    
    Spawn1:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("medikit2",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(40, "Spawn")
        TNT1 A 1
        Wait
    
     Spawn2:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("stimpack2",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(80, "Spawn")
        TNT1 A 1
        Wait
        
    Spawn3:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("Healthbackpack",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(20,"Spawn")
        TNT1 A 1
        Wait    
        
    Spawn4:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx("HealthPack2",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(20, "Spawn")
        TNT1 A 1
        Wait    
    
    Spawn5:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Healthbonus",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Wait
    
    Spawn6:
        TNT1 A 0
        TNT1 A 1 A_SpawnItemEx ("Bandages",0,0,0,velx,vely,velz,0,SXF_NOCHECKPOSITION|SXF_ABSOLUTEVELOCITY)
        TNT1 A 0 A_jump(100, "Spawn")
        TNT1 A 1
        Wait    
    

}}

 

I even made the crate face the player (I think) before spawning the items, but they still spawn toward a fixed direction of the map. Here's some screenshots of what happens: no matter the starting position of the player when he opens them (I tried approaching the crates from different directions), the items always spawns "to the left" of the map.

 

 

[ketmar]

can you upload a small test wad, please, so i can check the actual code?

[Grey_Wolf]

I have to edit it a little since my mod is full of custom items, but yeah, coming up.

[Grey_Wolf]

There you  go. use "summon closedcrate" and "summon cratekey" to test it ingame.

Again, thanks for your patience and support!

CrateDemo.zip

[ketmar]

kick me if i know why, but your code always spawns loot flying in player's direction (in \|/ pattern), althrough it shouldn't. i checked it in gzdoom (quite old, like ~2 years old), and in my k8vavoom (after i implemented `A_CheckProximity()` decorate action ;-).

 

i should prolly take some sleep and try it all again. ;-)

[Grey_Wolf]

Well considering how inexperienced I am, the chances that my code is very dirty and unrefined is very high. I also noticed a pattern, but this pattern resets and changes when I start a new game, so maybe the engine "picks" the random chances in advance and then stores them for all the incoming checks? I don't know.