I've been experimenting with POV's f_noise3d.
It can be used to simulate POV's turbulence in patterns but it cannot
simulate lambda because the function is 3-dimensional.
I think f_noise4d should do the trick. If you try to get the next turbulence
value from the 4th dimension instead of x,y or z. Lambda is the distance
travelled along the t-axel on each octave (Is it not?).

f_noise4d(x,y,z,t) could also be used in animating 3d-clouds. If you take
the next value from x,y or z the clouds seem to be moving instead of
changing. And if you want the clouds to move along x and change just move
the function along the vector<1,0,0,1>.
Would f_noise5d be needed if you want clouds with lambda?

Do we need a patch to add f_noise4d to POV or does anybody know how to do
4d-interpolation? (the f_noise3d uses 3d-interpolation, right?).

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