Last summer (i.e. in 1993), I added a realistic terrain rendering module in the DIVE system. The frame rate is of course much dependant on the machine and the graphics hardware you are using, but results give quite a good and smooth impression of reality, as may be seen in the following picture gallery.

The documents currently available are the following:

The User's Guide

The Programmer's Guide

A short design description

Some ideas that could be implemented