The agate face

by Christoph Hormann

This scene contains a quite minimal isosurface landscape 
with radiosity setup and light source.

Due to the contraints of the contest the sky is only plain color
and the isosurface function is quite low detail without much structure.  
You can play with it to get variations of the terrain geometry.  

With some imagination you can recognize a face in the rock
on the upper left.

Warning:

this scene renders quite slow as it is. 
For a faster variation have a look at the
long version of the code