Hi All,
I've put together an improved 3D clouds patch, available from here:
http://www.nanjika.co.uk/flightgear/clouds2.tar.gz
It fixes the following issues (to a greater or lesser extent):
1) Performance. Quad trees used to improve culling, and the sprites are placed
on the surface of a sphere rather than
randomly throughout the cloud, requiring fewer textures. This saves about
5-10fps on my machine.
2) Disabled 3D clouds have no performance impact. Previously they were still in
the scenegraph. Now they are removed.
3) Clouds are now loaded on start-up, and don't require the scenario to be
changed, they also work with METAR.
4) The cloud field is shifted as you travel. There's a small bug in that the
clouds "jump" as you reach the edge of the field.
5) Iterative sorting of sprites. This doesn't appear to solve the alpha
blending problem completely, but may help a bit.
Could someone please check it in?
On a related note, it would be great if people could create cloud textures. The
cl_cu.png texture appears to work quite
well, but the cl_st.png shows very bad alpha blending. If someone could take
the time to improve it, that would be great.
Feedback is very welcome, particularly if you are seeing performance problems,
or if the shaders don't work on your
graphics card.
-Stuart
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