I'm having several problems with the OSG branch. Actually, it's
still unusable for me. Some problems are only transient and rather
cosmetic, though still "horrible" for me and my bo105 (broken
"material" animation, no volumetric shadows), but others are
quite substantial. I don't mention this here to complain about
OSG. Mathias does a great job, and that although he's mostly on
his own, with not much help. Why I mention it is, because this
is also seems to be a problem under PLIB, albeit much less so:
It turned out that when I'm looking towards San Francisco City
from KSFO, the frame rate drops dramatically in OSG. From around
24 to only 6. Now I've investigated what the cause is. I used
this command line.
$ fgfs --aircraft=ufo --lon=0.51 --lat=0.51 --altitude=300 \
--prop:input/joysticks/js=0 \
--prop:cursor=Scenery/Objects/w130n30/w123n37/emb-1-fb.xml
The /input/joysticks/js=0 is a way to avoid any js input. The
--lon/--lat are to minimize other influences. 0/0 has the problem
that a yellow/blue glider sits there (WTF?!), and 0.5/0.5 sits
in a white rift.
If I place one or more of these buildings into the ocean, I get
this drop in framerate:
FPS
Number OSG PLIB
`````````````````````
0 97 89
1 74 85
2 62 82
3 54 78
4 47 76
5 43 73
6 39 71
7 35 69
Note how only four of these buildings drop my framerate in the OSG
branch to 50%! Scary! The building seems to cause z-buffer-fighting.
There are some textured faces positioned rather close to each other,
but apart from that the model looks rather unspectacular, with no
transparencies (material or texture).
m.
PS: Linux 2.6.19.2, nVidia FX5500/256MB.
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