Le 30/12/2011 17:13, kurtz le pirate nous fit lire :
> Hello,
> 
> I have some difficulties to orient objects.
> 

> It's not really a povray's question, probably more than mathematical :
> Is my method of calculation is correct ?
> How to properly orient my torus depending on the normal vector ?

Let's sum up: you have three points in space, two hexagons & origin.
you find the plane in which the three points are. (that's the vcross)

Then you need to move a torus to align with that plane.

I would suggest

#include "transforms.inc"

and using  Reorient_Trans(y,vn)

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