Doors....yes I know how to make them

[doomXL]

Whenever I make a door When I go into 3D mode the whole map is messed up and looks nothing like it does in 2d mode. When I try to test it it says the lines have to be fixed to play! please help!

[CodeImp]

F4 for map analysis and advice on any errors there may be in your map. Some can be fixed with a single click on the Fix button, however, read the advice first, you don't always want such an easy solution :)

[Doomguy0505]

Have you tried restarting DB? Sometimes it goes into this weird state where it corrupts lines until you restart DB

[Butts]

you most likely have one sided lines front sides facing the void, or some overlapping sectors, unclosed sectors, or self-referencing sectors, etc. you have to fix them. and remember to stitch vertices.