Fix some next level pb with practice mode. Fix #58
[neverball] / data / mtrl / marble-brown-polished
1 0.2 0.2 0.2 0.8
2 1.0 1.0 1.0 1.0
3 0.2 0.2 0.2 1.0
4 0.0 0.0 0.0 1.0
5 20.0
6 4