Perhaps you are looking for hyperbolic paraboloid shape,
which can be implemented using POV quadric object.

See http://mathworld.wolfram.com/HyperbolicParaboloid.html
for this shape details.

Disnel

Edmund Horner wrote:
> 
> I am considering how to render the shape of a "twisted square".
> 
> The shape is defined by four points, with a surface made of straight lines
> forming a grid over the "square".  Apparently this is a quite reasonable
> shape, and is useful for making surfaces.
> 
> But I do not think pov-ray provides it.  Anyone got any advice on how I best
> go about adding it?
> 
> Edmund.

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