Screenshots and Videos (Recommended to watch in HD):
Short Algorithm Descriptions:
A brief introduction to normal mapping can be found in Wikipedia.
The Perlin Noise
solid textured clouds are described in  and . Here
is a website with some interesting information related to the topic.
 Ken Perlin, "An image synthesizer", SIGGRAPH 1985
 Ken Perlin, "Hypertexture", SIGGRAPH 1989
Many thanks to my mentor Fabien Chéreau, Alex Wolf and the Stellarium development
team for giving me the opportunity to participate in the ESA
SOCIS, as well to the organizers of the summer of code! Also, special thanks to James Hastings-Trew for his textures and bump maps.