Isn't Doom Three D?

I ask you, o sawell, isn't doom? Isn't doom three d? I mean, i know that. You explain to me the actual difference in and the traffics. Noware a distaation? Ye, there's, you know, like normal. In doom, when you look in the distance, you see perspective whir things in the distance get smaller,. But they only get smaller on the x i plane. If you look up, things don't get smaller. And as i the math, all happens on the two d plane. So going from two d, or even a two point five d engine like doom, to a three d engine like quake,