The painting processes ( they may be treated like tutorials)

Today was brought this gallery very many new things! I have added !five! material tetrahedrons and the painting processes to every tetrahedron. 

The tetrahedrons:

And videos for your attention!:

(Sorry, my internet connection doesn't allow me download all the videos here. So I'll just put the links)
http://www.youtube.com/watch?v=zS2gh-8Yl8U
http://www.youtube.com/watch?v=nc9vevIzlpw
http://www.youtube.com/watch?v=Odg4urN0rGE
http://www.youtube.com/watch?v=_fL4b3ya-00
http://www.youtube.com/watch?v=itvTGVLqoUM