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Previously if the elevation of the terrain vertices was higher than the airport, the terrain pushed through the airport, looking ugly. This adds the concept of elevation constraint models, which the VPBTechnique applies when generating terrain vertices. Simply add a scenery model to the contraints on the technique, and terrain won't poke through it.
SimGear - Simulator Construction Tools ====================================== http://www.flightgear.org SimGear is a set of open-source libraries designed to be used as building blocks for quickly assembling 3d simulations, games, and visualization applications. SimGear is developed by the FlightGear project and also provides the base for the FlightGear Flight Simulator. Source code for SimGear is released under the GNU Library General Public License (LGPL) - see COPYING for license details. See INSTALL file for help on building SimGear.