> And the most difficult of all is that the surface looks way too perfectly
> streched.

I suppose you mean, the irregularities are missing. You can add them without
changing the model a lot. Once, I did the following: Changed the cylinder
primitives to using a cylinder macro, that makes an irregular cylinder. It's
not going to mix perfectly with the boxes, but it will be what it's supposed
to be: Imperfect and random... Something like:

#declare Irregularity = .075;
#declare Steps = 10;

// First the usual parameters of a cylinder, then the extra stuff
ir_cylinder ( -1*y,  1*y, .5,   Irregularity, Steps )

This will add some noise to the edges of the object, and that might be
enough to make a bumpy texture convincing.

Regards,
Hugo

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