Finally I've got the new engine fixed. Now it looks much better.
Here's a new version of Kg3D, with both: old and new engines. The newer one creates better images, but seems to be buggy, sometimes produces strange effects. The older one is stable, but slightly slower.
some minor improvements
The first so-called stable release of Kg3D is now available. Oh, and, at last, a simple map editor is included, so you can create your own maps and explore them!