Radiation API

[DustyDave961]

Radiation resistance API made with the help of Microsoft Copilot to fix #605.

[DustyBagel]

Seems fine. This should probably be reviewed by someone who understands how this works better though.

[SmallJoker]

Unfortunately this only works on nodes that are already registered when technic is loaded.
A few ideas to fix that:

1. re-add the previous cache_radiation_resistance to lazily calculate the node value when needed
2. calculate all values either in core.register_on_mods_loaded or in a core.after(0, function() ??? end) callback (first server step)

[DustyDave961]

I found such functions in the Minetest lua api, but I'm unsure how to use the minetest.register_on_mods_loaded(function()) function. Do I just replace "function" with node_radiation_resistance, or is there more to it? I'm still quite new to all this.

Edit: @DustyBagel has informed me that function is not backwards compatible with certain versions of Minetest. I don't think it's a big deal, but should we consider the minetest.after function instead?

[SmallJoker]

core.register_on_mods_loaded (core == minetest) is run after all mods are loaded. You can still use core.override_item if needed.

Here's what I would do: loop through core.registered_nodes and cache the resistance values (where it is present). Afterwards, node_radiation_resistance() could always retrieve the value (or 0) from the cache without any additional computations. That's computationally more expensive on startup, but has the lowest memory footprint in the long-run and more predictable code execution time.

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Changelog 0.4.16 → 5.0.0 mentions this callback. Minetest 5.0.0 is already the minimal requirement for technic, thus this is not of a concern.

If functions are not mentioned in the changelog, you might as well have a look at the git blame of the lua_api.md line, which reveals when it was added.