+
+ // ***************************************************
+ // * do turbulence *
+ // ***************************************************
+
+ // copy user's position from the AIManager
+ double user_latitude = manager->get_user_latitude();
+ double user_longitude = manager->get_user_longitude();
+ double user_altitude = manager->get_user_altitude();
+
+ // calculate range to target in feet and nautical miles
+ double lat_range = fabs(pos.getLatitudeDeg() - user_latitude) * ft_per_deg_lat;
+ double lon_range = fabs(pos.getLongitudeDeg() - user_longitude) * ft_per_deg_lon;
+ double range_ft = sqrt(lat_range*lat_range + lon_range*lon_range);
+ range = range_ft / 6076.11549;
+
+ if (range < (diameter * 0.5) &&
+ user_altitude > (altitude_ft - 1000.0) &&
+ user_altitude < height) {
+ turb_mag_node->setDoubleValue(strength_norm);
+ turb_rate_node->setDoubleValue(0.5);
+ }