Acknowledgement:

The 6-sided skybox images were created by:

By Jockum Skoglund aka hipshot
hipshot@zfight.com
www.zfight.com
Stockholm, 2005 08 25

The Hemicube skybox was part of a Blender tutorial:

http://www.tutorialsforblender3d.com/Textures/Skys/Sky_Box_2.html 
