9dc1b5f6f5
Comments from Till: I started the project at the end of february with a simple idea: move all 3d-model loading to the DatabasePager-thread. my first attempts looked promising, though they were a little too optimistic (or naive?). the patch has evolved a lot since. currently it does the following things: 1. revive SGModelLib, move functions for xml-model-loading there 2. replace all calls to sgLoad3dModel with calls to either SGModelLib::loadModel() or SGModelLib::loadPagedModel() almost all models will be loaded by the DatabasePager. the few exceptions are: your own plane, shared models in scenery, random objects, AIBallistic models. 3. simplify mode-loading functions (avoid passing around fg_root) 4. avoid supurious MatrixTransform nodes in loaded models 5. fix some memory leaks
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