Did the Srb2 engine introduce FOF?

[Thokk]

So, I was playing around in Zandronum loading Srb2 maps (especially final demo zone) when I noticed that bridges, platforms and other things were missing, then I remembered that Zandronum doesn't have FOFs and these objects were broken.
Then I thought to myself "did Srb2 introduced FOFs?" And, here we are.

Well, did Srb2 introduced FOFs or the Doom legacy source port already have these?

 

[Tatsuru]

FOFs (or 3D floors as they're referred to in the Doom community) were actually introduced for the first time in DOSDoom, the first Doom source port. Apparently, SRB2's Demo 1 (which came out in November 2000) already featured FOFs before Doom Legacy implemented them in December that year, however.

 

[DrTapeworm]

i'm pretty sure zandro does have 3d floors since they're a rather old zdoom feature, you're just not gonna see them in a straight port of an srb2 map because the linedef type numbers aren't 1:1.

 

[Mistake]

FOFs (or 3D floors as they're referred to in the Doom community) were actually introduced for the first time in DOSDoom, the first Doom source port.

Really? is there a map using it in DOSDoom?