i first noticed this when editing cockpit shapes, when the polygons get too close to the "camera" the become invivible, ie with the cockpit shape you have to stretch the cockpit sides out to a unrealistic angle otherwise they disappear in game.
whilst playing with your camera editor, i noticed this happens too, ive been playing with the t-cam and putting it into a position that resembles the cockpit view, but half of the car is now invisible, now ill get to the point, when using cameditor it displays these polygons as invisible just like gp4 does, so obviously you know why this happens.
is it possible to alter the distance at which these polygons disappear, or is that what the details section of camedit is all about ?