[vorbis] square polar mapping - backgrounds

[Segher Boessenkool]

Ralph Giles wrote:
> I always assumed this was something monty came up with independently. I 

I believe he did, yes.

> suppose it's a bit like a polar version of the manhattan metric, but 
> I've never seen a reference to it elsewhere. The whole point is just to 
> avoid the trig functions.

It's just a way to tile the plane.  Triangles/hexagons might
have been better, but then again, maybe not.  Someone will have
to try to find out ;)

<p>Segher

<p>--- >8 ----
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