Stuart Buchanan wrote:
> Scott Hamilton wrote:
>
>> On Tue, 2009-10-06 at 22:06 -0400, William Harrison wrote:
>>
>>
>>>> Maybe it's just me, but has anyone noticed a dramatic performance
>>>> decrease with 3d clouds after this patch?
>>>>
>>> yep, from 30fps to 2fps...
>>>
>
> I'm very surprised that performance has decreased so significantly. However,
> there is a possible explanation.
>
> The code falls back to a 2D cloud layer if a 3D cloud isn't defined for a
> specific cloud type (st, ac etc.). IIRC
> previously we didn't define a 3D stratus layer, so we'd get a 2D layer
> instead.
>
> The updated 3D clouds include stratus layers (which look rather nice IMO),
> but require quite a larger number
> of sprites - something like 40 per cloud. I've seen a small perf hit from the
> new stratus layers, but nothing like
> what you have reported.
>
> I suspect what you are seeing if the difference between a 2D and 3D cloud.
>
> What performance change are you seeing with, say, cumulus clouds, which
> haven't changed much?
>
> BTW - I've updated Docs/Readme.3Dclouds with information on the new format,
> if anyone is interested in enhancing
> the clouds.
>
> -Stuart
>
What I have seen (airplane-ufo, altitude - 2000ft, cloud layer 0 =
4000ft, overcast, cloud layer 1 = 19500ft, cirrus):
1. 3D clouds OFF from command line: FPS=70, memory usage 360M, layer 0 -
visible.
2. 3D clouds ON from command line: memory usage from 800M up to 1.2G
- pitch =0 deg : FPS=10-12
- pitch =90 deg : FPS=70
- pitch =-90 deg : FPS=70
3. 3D clouds ON from command line, than switch OFF from menu : FPS =
60-70, memory usage 700-800M
4. 3D clouds ON from command line, start at lat,lon = 0, 0 (no scenery
loaded) : NO clouds in layer 0, both 3D and 2D. If switch 3D clouds OFF
from menu then 2D clouds appears.
With respect,
Alex
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