3D Vision allows targeting through the floor across z-levels.

[Malkeus]

0.C-9420-gfcdeea5 - Windows 7, 64bit SDL

Exactly as the title states. I noticed this while looting a floating temple from Arcana mod. I'm up on the 3rd floor inside the temple and I can see monsters down below me, pressing 'f' snaps to them down on the ground and I can shoot and kill them through the floor.

This is up in the temple, with a monster on the radar but not on screen: https://i.imgur.com/7NyN9Pe.png
After pressing 'f', it snaps to the target, through the floor and down 2 z-levels: https://i.imgur.com/krEEb5W.png
Something is in the way, a wall, a door, etc. I smashed the door to the north shooting something below me: https://i.imgur.com/x3SuVv6.png
Repeated firings end up killing the monster: https://i.imgur.com/CqaKvaK.png

I will see about reproducing this without any custom mods and get a save file uploaded if needed, but I don't see it happening any differently with a vanilla gun and a zombie.

[Coolthulhu]

Targeting is one thing - you should be able to target anything you see. Though monsters seen with clairvoyance should probably get a lower priority.
The bigger problem is that projectiles aren't stopped by the floors.

[Malkeus]

I don't think I should be able to see them, since the entire top of the tower is enclosed by walls. And I don't have clairvoyance on. The behavior I'd expect in that room is that I wouldn't be able to see beyond the walls and floor in any direction. It seems like floors don't block vision at all as far as the 3D code is concerned. I've encountered weird things like bots tazing things through the floor and getting biled on from above or below. This is the first one I've been able to reliably reproduce though.

[Shadefang]

I actually had a similar issue to this a few builds ago with IR vision allowing me to target stuff through the floor that's probably related. I'll see if I can replicate it.

[Coolthulhu]

Should be fixed now