SkyboxSet by Heiko Irrgang ( http://gamvas.com ) is licensed under
the Creative Commons Attribution-ShareAlike 3.0 Unported License.
Based on a work at http://93i.de.

To view a copy of this license, visit
http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to
Creative Commons, 444 Castro Street, Suite 900, Mountain View,
California, 94041, USA.