On Thu, 2008-11-06 at 20:47 +0000, Stuart Buchanan wrote:
> 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?
Seems to be checked in now...
> 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
I'm seeing 20-30 fps with clouds now and 40-60 without 3d clouds. Big
improvement! Thanks Stuart!
Ron
Fyi:
With Without
Event: 5 4
Update: 25 13
Cull : 2.6 1.5
Draw: 7 5.5
GPU: 10 8
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