Max number of nodes terrafit

I have been trying to use SRTM-1 arcsec data for the underlying terrain
and have been problems with trying to figure out the number of polygons
to allow.  If I don't specify enough polygons, my terrain can end up
looking like huge glaciers (sometimes on the order of 30000m tall -- are
these related to the final error when the max number of polygons are
reached?) 

If I specify too many polygons then it takes FOREVER to generate the
scenery and FlightGear crashes.  What is the max number of polygons
FlightGear can handle reasonably?  

I have used 2000 to 4000 max polygons sucessfully.

Any words of wisdom or suggestions on rules of thumb on how to handle
this?

Can TerraGear handle TIN inputs from GIS software?


Thanks.
Stacie
  

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