Re: [Basic] Skill of the week: Artillery (and Forward Observer)
If the observer, gun, and target are approximately colinear, then the Cartesian to polar problem is pretty much as simple as fredtheobviouspseudonym suggested. Normally that can't be assumed, of course, but if the mortar is a squad (or adventuring party)-level asset it might be used that way.
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I don't know any 3e, so there is no chance that I am talking about 3e rules by accident.
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