params should not be contiguos

[gagiuntoli]

https://github.com/GG1991/micropp/blob/0f9592ba9fe398ec177f10c32f9c2070dd5505ac/test/test3d_8.cpp#L62

I am not sure if this work because the first 4 values should be in 0 1 2 3 position in the array and the other 4s should be in 10 11 12 13.