The vehicles I tinker with won't take much part in the climate change. But oh brother, the details you have to take into account to get everything working nicely. Such as balancing steepness for the "path finding". As you might know empirically, or more probably sense intuitively, cars won't climb just any hill. I use some predefined Catmull-Rom splines for "path finding", but if a vehicle is shot out of orbit, or pushed by some physics toy, it has to re-evaluate where to go and then steepness comes into play. All four vehicles have very different characteristics, but I'm striking the golden mean. I use Catmull-Rom since the parameterized curve passes through all control points. It looks like this when I place the control points, then I configure the paths using regexps.
