Re: Constructing pfASD

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Lee Willis (lwillis++at++inreach.com)
Thu, 16 Apr 1998 00:47:30 -0700

> > Dan is talking about having a preconstructed polygonal database at the
best
> > LOD,
> > and then trying to derive coarser LODs from that set of polygons --
can't
> > be done.
> >
> > You're talking about starting from elevation data -- that *can* be
done.
> > Multigen CAT
> > does it, or you can write you're own.
> >
> > In very broad strokes, here's how:

[algorithm snipped]
  
> So, if one modified this algorithm to insert only points from the source
> TIN instead of from the source DEM, one could arrive at the source TIN!
> This may not be straight forward, but possible.

As others pointed out -- a TIN is more than sum of all it's points. You
also
must have all the same edges connected to the same points. This cannot
be guaranteed with an arbitrary mesh.

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