[Sascha]

maybe something like this:
(no clue if it works, though)

pawn Код:

stock IsVehicleInRangeOfPoint(vehicleid, Float:range, Float:x, Float:y, Float:z)
{
    new Float:x, Float:y, Float:z;
    GetVehiclePos(vehicleid, x, y, z);
    if((x <= x + range && x >= x - range) && (y <= y + range && y >= y - range) && (z <= z + range && z >= z - range)) return 1;
    return 0;
}