General Modding Help Thread

[Perzival12]

I got tired of making a new thread for every new question and error, so I thought that I would make a thread for all questions and answers (along with guides) to post on. If you need help doing something for your mod, want help with errors you generated, or want to post some guide or tutorial on how to do something related to modding, and don't think it deserves/needs it's own thread, post it here.

[Perzival12]

Okay, I have two questions. I am using the SpawnEntityOnDeath feature to make a unit spawn more units when it dies (a siege machine spawn it's crew). However, when I try, the spawned unit just stands there, like a corpse. It can attack and turn, but it can't move. My second question is if there is a way to spawn multiple units using the SpawnEntityOnDeath feature. Does anyone know how to do either of these things?

[Stan`]

`SpawnEntityOnDeath` Only creates local entities, it's meant for say debris, or an explosion decal. https://gitea.wildfiregames.com/0ad/0ad/src/commit/32edc28cda72d0c9cd70937d7c46c58322bcf040/binaries/data/mods/public/simulation/components/Health.js#L403

[Perzival12]

It also works for static items, I.e. things that don’t move, like treasure. Is there a way to allow it to spawn move able entities? What do you think it would take?

[wowgetoffyourcellphone]

On 07/11/2025 at 1:56 PM, Perzival12 said:

Okay, I have two questions. I am using the SpawnEntityOnDeath feature to make a unit spawn more units when it dies (a siege machine spawn it's crew). However, when I try, the spawned unit just stands there, like a corpse. It can attack and turn, but it can't move. My second question is if there is a way to spawn multiple units using the SpawnEntityOnDeath feature. Does anyone know how to do either of these things?

 

16 hours ago, Stan` said:

`SpawnEntityOnDeath` Only creates local entities, it's meant for say debris, or an explosion decal. https://gitea.wildfiregames.com/0ad/0ad/src/commit/32edc28cda72d0c9cd70937d7c46c58322bcf040/binaries/data/mods/public/simulation/components/Health.js#L403

 

13 hours ago, Perzival12 said:

It also works for static items, I.e. things that don’t move, like treasure. Is there a way to allow it to spawn move able entities? What do you think it would take?

 

 

SpawnEntityOnDeath used to be able to spawn player-controllable entities. I made tests several years ago where chariots would spawn its rider when killed so that the rider could charge at the enemy and get a few strikes in before dying. Again, this worked fine... a few years ago. I'm not sure what changed.

 

[hyperion]

1 hour ago, wowgetoffyourcellphone said:

SpawnEntityOnDeath used to be able to spawn player-controllable entities

As @Stan` correctly stated only a local entity gets spawned. This was always the case. So either you implemented it differently or it was subtly broken anyway. Do you still have to code and is it publicly available?

[Perzival12]

5 hours ago, hyperion said:

As @Stan` correctly stated only a local entity gets spawned. This was always the case. So either you implemented it differently or it was subtly broken anyway. Do you still have to code and is it publicly available?

I deleted it from the unit, but I can add it back in and post the unit here for you to look at.

[hyperion]

1 hour ago, Perzival12 said:

I deleted it from the unit, but I can add it back in and post the unit here for you to look at.

SpawnEntityOnDeath definitely doesn't work, so I think @wowgetoffyourcellphone did something different or it was broken without being all to obvious back then. If you want to add a unit as if trained for example, so that the simulation knows of it, and place it where the old one died instead. An example is QuickSpan in binaries/data/mods/public/maps/scenarios/pickup_test_map_triggers.js.