this post was submitted on 14 Mar 2024
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On-Kill/On-Hit effects: Signal train vs reference passing (lemmy.world)
submitted 9 months ago by Jozzo@lemmy.world to c/godot@programming.dev
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Wanted some opinions on ways to set up triggering "on-kill" effects. In short: The player can have abilities that trigger effects whenever they shoot and kill an enemy. I'm also looking to extend abilities to enemies as well, so can't just hardcode a player reference.

Currently I'm doing it like this:

  • Enemy signals that it died -> the bullet receives this and signals that it killed Enemy -> the player's weapon receives this and signals that it's bullet killed Enemy -> the player receives this and triggers it's on-kill abilities.

It simultaneously feels like a good way to go about it but also a long mess. The other option I've considered is:

  • Each bullet has a reference to it's owner (eg. player). When an enemy dies to a bullet, it looks to the bullet's owner reference and tells it to trigger it's on-kill effects.

This way is a lot simpler to write, but is error prone eg. In cases where the bullet's owner is killed while their attack is mid-air.

Thank you all!

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[–] Jozzo@lemmy.world 1 points 9 months ago

Thanks for your input! The other commenters pointed out that I can use Godot's is_instance_valid() function to check if the bullet's owner exists before attempting to call anything on it, so will be reworking the system to use #2 + that.