This is really nice. Took me a couple of seconds to 'see' what I was looking
at! I sympathise with the background problem - I too had trouble thinking of
anything simple and effective. I'm now spending longer on the background
than I am on the knots...

Suggestion, to be used/recoiled from as you see fit: Put a layer of cloud
beneath the knot, then a moonlit landscape (fields, etc) below that. The
effect would then be of the knot floating 1000s of ft in the air, with the
viewpoint even higher but looking straight down.

> The cars are simply placed in pov, using position and angle infos read
> in Wings3D. I just chose the points where I wanted the cars to be, read
> the corresponding position (and angles) in Wings, and then
> translate/rotate the car object as needed in pov.
Another option would be to use trace().

> I wish a had the
> spline describing the car path along the whole knot, so I could for
> example make an animation, but this would require to read manually the
> position of a few hundreds vertices in wings :-/ I could not figure an
> easy/lazy way to get this info yet...
I specifically looked for parametric functions describing knots so I could
generate them algorithmically. If there's some way of persuading knotplot
to give up a mathematical function, it'd be no problem. It might be worth
contacting the author in this regard...

It'd be great to see some more of this work - keep it up!
Bill

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