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Interpolation ...


Does anybody know of a function/package that will allow interpolation
over irregular domains?  The worst-case senario data set goes something

data = Table[{Random[], Random[], Random[]}, {128}];

What I want is

int = Interpolation[data, InterpolationOrder->0];

It's not _quite that_ bad though.

The application is trying to properly display a finite-element mesh.  I
can display it using a combination of Graphics2D and Polygon.  However,
when I try and zoom on portions of it, the Polygons spill over the axes
and I end up with a mess.

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