"Thomas de Groot" <t.d### [at] internlDOTnet> wrote in message 
news:48c3964b@news.povray.org...
> Once in a while I try to solve this puzzle, but I give up. It is beyond my 
> skills.
>
> How would one model this pavement in POV-Ray? It looks simpler than it is 
> as - obviously - the inner arc of a row of stones is smaller than the 
> outer arc. In RL (as on the examples below) this is constantly compensated 
> I suppose to keep the pattern regular and symmetrical....
>

I would think that the key distances of any significance in the sample 
picture you posted are the radius of the outer edge of an arc and the centre 
to centre distance.  In your image I would think that the stick is used to 
keep the outer radius constant and that the strings keep the centre to 
centre distance constant (and, in this instance the lines straight). The 
radius of the inner edge is already set by the previous arc of stones and 
would be used only as a guide to pick a block of the right depth.

To get a good join, the tangent to one arc should pass through the centre of 
the other arc (and visa versa) so that you get a right angle at the joins 
and you can use a square block there to give a perfect join. This means that 
the centre to centre distance would have to be the Radius times the square 
root of 2.

Regards,
Chris B.

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