In all GPL tracks you look at the 3do and you drive on the trk. As Sky says, you can make the textures look however you want and it will not affect what it feels like to drive on.
You are quite correct that in the trk file that transition texture in the 3do is mapped onto a surface which is grass, and so although it does look like it is part tarmac and part grass, the surface you are driving on is all grass. Your options are to either drive further in from the edges or to change the texture to show exactly what the surface is. You could achieve this either using a straight line edge between the surfaces which most accurately represents what you are driving on, but also looks very unnatural and unattractive, or you could modify the transition textures to have much more grass and much less tarmac in them, although you would still not have perfect definition of where the edges are. Another option would be to add a thin line at the edge of the transition texture which would show where the edges are, but would also maybe look a little better, although since the real track did not have this "safety" line this is also unrealistic.
Sky's point about track widths is also a good one, since necessarily when making tracks, the transitions between surfaces needs to be considered. I have seen a variety of approaches, and personally I tend towards using concrete at the edges but including that concrete as part of the total real track width, so that the edges have slightly less grip, perhaps indicating a build up of dust and dirt there. However, when editing a released track there is no option to adjust that retrospectively, so we are stuck with whatever decisions were made in the original release.
In transition textures it is generally better to go for an asymmetric split though I guess, so that the underlying surface is better represented and drivers automatically adjust their lines accordingly.
Rob
This post has been edited by Border Reiver: May 16 2010 - 03:03 PM
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