[sldev] Wind Sound CPU usage.

[Aimee Trescothick]

Removing the damping causes audibly abrupt changes, almost clicks,  
when starting and stopping movement. Try hovering in place and then  
flying up or down a short distance.

Looking at the frequency spectrum of the final wind noise, most of  
what's generated is being filtered out, so a lot of work is being  
done for nothing. Just tried a quick experiment  generating it at  
14.7k and then interpolating groups of 3 samples, which seems to work  
OK, giving a roughly similar spectrum.

I've attached the rough patch of what I was playing with, it's a bit  
ugly and not quite right as there's a little crackle creeping in, but  
shows what I'm on about :)

Aimee.

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On Mar 5, 2008, at 09:17, Jason Giglio wrote:
>
> https://jira.secondlife.com/browse/VWR-5308
>
> I've written a optimization/cleanup patch for the wind noise  
> generator.  Got it down from 5.5% to 2.25%.
>
> Callum, I was able to move most of the filter code out of the inner  
> loop by getting rid of the gain/frequency damping.  I can't tell a  
> difference with the damping gone, I don't think it was  
> accomplishing much because it was damping very quickly to the  
> target values.