From memory, "things" / entities aren't visible on the map by default, but toggle keys and/or cheat codes can make more stuff visible.
Projectiles (from the rocket launcher, plasma gun, and BFG9000) will fly around.
You can't see the projectiles from hitscan weapons fly across the map, but things like puffs of smoke on the walls where a weapon hits it are short-lived "things" and you can see them blink into (and out of) existence.
Projectiles (from the rocket launcher, plasma gun, and BFG9000) will fly around.
You can't see the projectiles from hitscan weapons fly across the map, but things like puffs of smoke on the walls where a weapon hits it are short-lived "things" and you can see them blink into (and out of) existence.