aiGetExportFormatDescription() now creates an Exporter object at the beginning of the function, so that a call to `GetExportFormatDescription()` doesn't access free'd memory.
+ aiCopyScene -- a bit dysfunctional because we will also need getters and setters for all other scene components to avoid running into ownership & heap issues when users modify scenes.
# fix handling of postprocessing during exporting
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1061 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
+ introduce aiScene::mPrivate. This is a potentially breaking API change. The new member is added at the end of the structure though, so serious regressions are not to be expected.
+ add a mPreprocessing parameter to all Export API calls. Allow exporters to specify further PP steps to be executed prior to handing control to them. The entire export API now operates on a copy of the scene that the user passed in.
- mass refactoring: all constructors of BaseProcess/BaseImporter inherited classes are public now and Importer will perhaps feel a bit sad after having loft all of its friends.
# fix const correctness in SceneCombiner
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1060 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
- implement ExportToBlob/aiExportToBlob via a custom IOSystem implementation.
- split exporter C and C++ interfaces.
+ test cases for the exporter interface
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@913 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
