The AI isn't really up to it, but having projectiles be able to lay down semi-persistent damaging particles or fragments behind them as they travel would be useful for nano, radiation and/or chemical weapons.
Currently we can only lay down non-damaging exhaust trails, or have a single release of particles/fragments as a detonation.
george moromisato 18 May 2021:
In 1.9 Beta 3 you can add fragmentInterval="10"
to create fragments every 10 ticks (or whatever). E.g.,:
<ItemType ...>
<Weapon ...
fragmentInterval="10"
...
>
<Fragment
count="..."
...
>
</Fragment>
</Weapon>
</ItemType>
In 1.9 Beta 4 I made some tweaks to improve this. In particular, the new fragments inherit the original velocity, so they appear to follow the original shot.
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