[it works, hehehe]
CTZn, it would be cool if you would find the time to make some presets that are equivalent to dusty air, water, steel, and white plastic, so that people can toy around with the materials inside (the Blinn-Implementation you made seem to work pretty neat).
Attached is my final update for Arne, i've added simple buttons to access the main functions and fixed some bugs, started with a hint.txt, and somesuch.
regards
