Re: Max number of nodes terrafit

Corrubia, Stacie K wrote:

>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?) 
>  
>

This sounds like a data conversion problem and nothing to do with the 
maximum number of polygons

>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've used 1000 nodes per tile as a middle of the road value ... a lot 
depends on what kind of hardware you have to throw at the problem.

>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
>  
>

Probalby not directly, but you might be able to import the points if you 
rewrite them in the ".fit" format and let TG retriangulate after it 
merges in all the 2d polygon features.

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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