Oops, I have a problem with the textures. [edit] read your note you just posted [/edit] If you like the wide open feel, please consider Tumbleweed flats from the game, or one of these:
Deadman's gultch, fila's holiday, or tecate 350.
http://malibu350.com/scraps/TerrainTex.htm
I know you haven't done this for a while so I think people will be very forgiving if you don't get it looking 10,000% perfect, but I believe you'll be much happier with it if you put in a couple hours spiffing it up. The terrain is pretty good, so I think it'll be worth it.
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The course is also causing some grief there. Lotta triangles. I think if you spread the ends of the segments further apart you'll get a better looking map, and maybe even the comp trucks will work a bit better too.
<center><img src="http://cownap.com/~mtmg/traxx/images/course10.gif" width="217"></center>
The ends don't necessarily have to be perfect 90 degrees, but the spacing does help. The good thing is you only need to do the main course, then you can generate courses 1 and 2 with just a right click.
And try to get them end to end in numeric order. If you have extras, you can right click the end of a segment and delete it. (don't do delete all, lol).
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But no matter what you do, generate a custom track palette so whatever textures you do have in there, and the backdrop, will look infinitely better than what's there now.
http://cownap.com/~mtmg/traxx/palette.html
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Any problems or questions, just ask.