3D Engine Design

During the past weeks, I haven't been able to come up with something new and/or meaningful. But for those interested in building a 3D engine, I came across the Lightfeather 3D engine. And the guys over there describe (in a high level manner - functional point of view) the design of their engine. So an experienced graphics developer might use this information to design a "copy" or get inspired by the Lightfeather engine.

Following is the "table of contents" of the Lightfeather 3D engine design:

1. Introduction
2. Geometry
3. Scene
4. Portals
5. Rendering