A note for developers:
classes declared by these .h 'es can be named differently:
- object database or
- core object API or
- Convex3D math model
The one is true: you cannot go without any of them... Usually changes in one of them cause a REAL BUNCH of sources to be recompiled, so it is not really recommended unless changes to be done are VERY important or significant (such as quality update or serious bugfix)