ZDoom

I'm trying to use projectile crosses a line to spawn a monster which does not seem to be working. neither shotgun or bullets will work. A rocket seems to work but only once but not repeatable. I did not try plasma. I would think shotgun and bullets should work or is this the way it's suppose to be? Can this be fixed?

Thanks, Chris

Bullets are not actually projectiles in Doom. They work as hitscans, which basically means that you fire, and the first thing in the path of where you fired will have the effects of the hitscan attack hit it. Also, check that you've flagged your line repeatable action.

Actually, hitscan weapons except the railgun don't trigger 'projectile crosses' types. This appears to be fully intentional because setting a single flag would change the behavior.

What you need is the activation type 'projectile hits or crosses'. Depending on the editor you are using it might not yet be accessible but if you want to add it yourself it is activation type 7.