I've found this interesting when observing Valve and community maps. Stairs always differ and generally recieve not enough attention than i believe they should. Especially by the new comers to mapping. I've personally been partial to a 2:1 grid for the incline of stairs. It looks neater on the grid and allows for a smoother transition between floors. How ever this does have the tendancy to take up a lot of space, and is problematic when spiralling a staircase along the walls of a room. Valve tends to use a 3:2. I've recently been picking this up for the space issue, although the texture rotation angle annoys me. The damage fall off of weapons in TF2 is atleast 3 times worse than TFC and so mid range combat ranges a lot smaller distance and requires smaller combat areas within maps. So there will be less room for stairs and ramps due to the exclusion of ladders. In a lot of ammatuer maps i've seen 1:1 grid inclines, which personally just looks horrific (Although can sometimes look ok with the wood texture for some reason). It also makes climbing said stairs quite dangerous when assaulting defencive positions. I suppose i might as well make a poll of this. edit: Those scales are ratio based, not size based. Some people got confused in chat about this.