[vtkusers] A DecimatePro question

[John Biddiscombe]

I haven't read the SigGraph paper referred to in the header, but it say this

"Each vertex in the mesh is classified and inserted into a priority queue.
The priority is based on the error to delete the vertex and retriangulate
the hole"

Suppose I wanted to reduce the mesh
a) Lots in places where population density is low
b) a Little in places where the density is high.

As my terrain model doesn't need to preserve mountains etc etc very
accurately, but does need to preserve embankments and cuttings and terrain
features in a town.

Would it be sensible to flag each vertex before the decimation with a
weight (inversely proportional to local population density) and then adjust
the priority queue insertion phase to consider not only the error metric,
but also the 'cost'  for the population.

Has anyone attempted anything similar using decimatePro. My initial
inspection of the code was a bit frightening and I welcome any comments of
suggestions..

Thanks

John B