To follow the discussion in p.b.programming (Re: An updated povr tarball
for Unix/Linux. f6b1c13e),

first attempt at having a warp to make an hyperbolic projection (the
poincaré disc)

It probably needs more controls as so far: the disc is at origin, unit
radius, in the x-y plane.

I believe it needs:
* to be moveable
* to be sizeable
* to be orientable

And maybe, it needs also to be able to be cut before reaching the
radius. And have a scaling factor between inside & outside. And maybe
also some rotation (along the axis above) ?

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