Experimenting further.
To align apparent wind direction and ship behaviour, I mirrored the 
isosurface's function around x. Of course, I could have turned the ship, but 
that is the easy way out and I prefer to experiment.

What I did was change: f_ridged_mf( (x+y*.2)/4, Q+y*.4, z/4, etc.  into: 
f_ridged_mf( ((x+y*.2)/4)/-1, Q+y*.4, z/4, etc

and: (f_spotted(x/5+y/5, 0, z/5)-.5)*1  into: (f_spotted((x/5+y/5)/-1, 0, 
z/5)-.5)*1

To stay on the save side, I added the parenteses before multiplying by -1. 
This should be faster than mirroring the isosurface itself. But maybe this 
introduces unwanted things. What do you think?

Thomas

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