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The Canvas camera and texture get recreated in several circumstances. Calling .release() on a ref_ptr will just return the raw pointer and 'delete' won't be called. The proper way to explicitly delete an object managed by a ref_ptr is to set the ref_ptr to NULL. This will delete it as long as it's not referenced by any other ref_ptr.
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.