I drew a map in photoshop and adjusted the ratio, imported it in 3ds max and applied it on plane mesh but what then? I've watched several youtube tutorials but they don't talk about intersections. So what is the easiest and most effective way to make it work?
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I would model the intersections beforehand, and then create the roads with modeling a section and extruding it along a spline (which you can create on top of your plane mesh as reference), connecting your roads to your intersections should require a simple bridge at that moment.