Hi,
Ralf Gerlich schrieb:
In the custom scenery I can only fly with 800x600 or with random objects
deactivated at 1280x1024. In the latter case I get around 12-18fps, in
the former case it drops down to 6fps at times.
I noticed that the customised scenery tends to produce not only more -
which I anticipated - but a lot more triangles than the original. We
have up to 30.000 triangles on a single tile, where 60% of that seems to
be due to line data (streets, small rivers, railroads) See my report on
<http://www.custom-scenery.org/Triangle_Counts.272.0.html>
FYI: I wanted to do some experiments with Michael Garland's Quadric
Error Metric Simplification[1] on some terrain tiles and when reading
the actual .btg.gz-files using SimGear I found out that we already had
about 30.000 triangles in a single tile in the South Germany region (I
used the tile around EDNY, e000n40/e009n47/3105386.btg.gz). In addition,
these 30.000 triangles are organised in as much as about 10.000 triangle
fans, making an average of 3 triangles per fan. I can imagine that this
gives a large amount of call- and transmission-overhead, throttling the
possible geometry throughput. I'd say that the ceiling on terrain detail
is far from reached, independent of LoD, plib or OSG ;-)
Cheers,
Ralf
[1] http://graphics.cs.uiuc.edu/~garland/research/quadrics.html
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