[[XST]O_x]

pawn Code:

forward IsVehicleInRangeOfPoint(vehicleid,Float:Range,Float:x,Float:y,Float:z);
public IsVehicleInRangeOfPoint(vehicleid,Float:Range,Float:x,Float:y,Float:z)
{
    new Float:vx,Float:vy,Float:vz;
    GetVehiclePos(vehicleid,vx,vy,vz);
    return ((((vx-x)*(vx-x))+((vy-y)*(vy-y))+((vz-z)*(vz-z)) ) >= Range*Range );
}

As for the stock,but you can't use one loop for vehicles and players.