Fix some next level pb with practice mode. Fix #58
[neverball] / data / mtrl / dark-glass
1 0.2 0.2 0.2 0.5
2 0.2 0.2 0.2 1.0
3 0.0 0.0 0.0 1.0
4 0.0 0.0 0.0 1.0
5 40.0
6 2