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You need to learn “Plane Equations” and the “Dot Product” at a *minimum*, and yes this *IS* the easy way. Eg. The ground in your game is a “ground plane” and has a plane equation of ax + by +cz = d (where xyz is a point on the ground and abc is a direction pointing 90 deg away from the ground) You can use the dot-product between your car and this plane to determine which side of the plane your car is on. Now imagine your road has imaginary walls (vertical planes), perform a dot product between your car and these planes to see if the car is outside the track. Although I don’t like large one-object racetracks, you could add additional planes (walls) to your track and test against these. (If this comment was disrespectful, please report it.)
As an alternative, you could define points[vectors] in the middle of the road all along the track. Loop through all points to work out which one is closest to the car, then if that one is further than X distance, it's off the road. This is crude and I don't really like it, but should be easy to program. You could even tell other cars to follow these road points, to have a race. (If this comment was disrespectful, please report it.)
Another possible alternative is use the Windows API to create a region, then check the four corners of the car to see if it's in the correct region. That won't help with varying heights in the road, though. Anyway, good luck with your project. (If this comment was disrespectful, please report it.)
Please Goto http://www.ink.je/reece/Amentrix/DirectX%20Area.htm For Some Tips And Objects (If this comment was disrespectful, please report it.)
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2/6/2005 3:00:50 AM: 
