I've spent the afternoon building a spacecraft fly-by demo for Entity Crisis. I've found that it is actually very hard to create a nice visual. Just because something is 3D doesn't magically make it a great looking scene. A lot of work has to go into getting the lighting right, and the material properties. The majority of effort goes into texturing. A boring model comes alive with the right texture. Fortunately I know a few good texture artists. :-)
I've also realized that a scenegraph needs nodes which can do things like enable and disable depth testing, blending etc. Not everything can be abstracted away into high level classes, the programmer often needs access to lower level functions.
The code and data is available in svn/qgl/trunk/demos/ec_intro.
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