Hi djoker, glad to see you again in the forum . And look forward to the new version of Irr4Delphi.
Why Apocalyx ? It is interesting еnginе -lua scripting and many other features but license of Apocalyx is not so liberal as to Irrlicht. Apocalyx license say "Permission to use, copy, and distribute the software and its documentation for NON-COMMERCIAL purposes and without fee is hereby granted provided that all copyright notices appear and no modification is performed." that is not so nice compared with zlib/libpng license of Irrlicht - "Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely..."