I have seen some masterful maps done in forge. One thing that stops me dead in my tracks, is how people make surfaces so perfect and smooth. The best example I can give, is how I want to make a room out of walls, but try as I may, the walls are always a little bit off, never perfectly aligned. I see the maps made on sandbox of racetracks, and I feel how exact the track is made. I wonder how is it done? If anyone can explain to me how to do this, I have a great map in mind. If you want to go the extra mile, send me a voice message in halo 3 Gamertag: "zwolf wolf" thank you in advance!
Well, the shortest answer would have to be "just use bracers". Use objects, walls, double boxes, teleporters, to keep everything in line. Make sure you're going by some sort of standard instead of just "eyeballing" it. Interlocking everything together can also make everything very smooth, a forging 101 guide can be found on that here. Basically it just takes a bit of extra time and effort to keep everything straight. Using bracers and interlocking anything that needs to be interlocked will help keep your map smooth. YouTube- Halo 3 Racetrack Making Tutorial: Rising Into and Continuing a Banked Turn Good luck mate.
How to forge a racetrack Tut one explains how to make hills going up and down. YouTube- H3 Racetrack Tutorials Ep. 1 (How to make hills) Tut two explains two to make a banked turn, and ALSO how to make an entire track using ghost merging. YouTube- H3 Racetrack Tutorials Ep. 2 (how to make banked turns and how to ghost merge)
A lot of the maps you see in the racing section are made by people who forge for a living. A lot of it seems a lot easier than it actually is. I am not deterring you. I am just saying that a lot of those maps are made with a lot of forge time in the bank. One trick that I use is, sometimes if I am doing a really tough piece, I will actually plug in another controller. I am able to see the piece from two different camera angles. It helps to have a big TV. If you have a really small TV, that trick might not work out. As far as interlocking goes, now a days I use a combination of traditional interlocking and the new ghost merging technique. Some of the tutorials the other members posted above are great and should give you some insight as to some of the tricks some of the forgers use. Other than that, I would say practice makes perfect. Start a project and don't give up. Even if it takes a month to make. Stick it out and you will see positive results.