I don't understand quads at all. What are the quads in general...and please don't say 4-sided faces, That doesn't make sense to me. Not the "4-sided faces" part...but how that works doesn't make sense to me. Why is there 1 top quad in the 2x2 ramp and 5 bottom quads? Also, what is an "omni quad"?
Quads are like categories for faces, the number below is how many faces are in that quad. If the north side of the brick is completely covered by bricks, then all of the faces in the north quad category are hidden. Same thing with east, south, west, top, and bottom. Omni quads are similar, except the faces in the omni quad category never get hidden unless the brick's rendering is turned off.
In that ramp, there is one top face, because if the entire top is covered, that's the only face we want hidden. That one face covers two studs because you can use the UV COORDS to change how many times the texture repeats and how stretched it is. There are five bottom faces because one is for the middle part of the texture, and the other four are for the sides.
