ZDoom

For a some reason FRIENDLY monster doesn't perform jump into its attack states if allied player stand on its line of fire, between monster himself and its target.

I know that it can be hacked via using A_Chase("Missile","Missile") AND using MeleeRange property for performing "Missile" state from Melee jump-pointer. But it very ugly solution since it requires to rework code for any actual Melee-state of similar monster.

So I'd wish to know:
a) why and where (in which exact part of action sequence) placed this "safety" restriction; and
b) how it can be avoided by less hacky way?

That safety restriction is part of the monster AI, it should be obvious why this was necessary for friendly monsters - they'd act far too stupidly without it.
The function is called P_HitFriend, but at the moment it cannot be overridden.

Got it, thanks for explanations. I hope that it will be open for overriding on further releases.

P_HitFriend source pls?

p_enemy.cpp, of course.

Graf Zahl, thank you.
Source for P_HitFriend restriction.

Well, current behaviour can be avoided via A_CheckLOF("<ranged-attack_state>",CLOFF_JUMPFRIEND), BUT with restrictions for correct work of a some default functions which can do a some LoF check, like as A_CPosRefire. The last one will always interrupt attack and force return into See state since it will consider FRIENDLY on its caller LoF as obstacle.