[Bf-committers] Game engine and samples

[Kester Maddock]

Hi Alexander,

It looks like they are from stuff that was happening before the open source.  
Maybe some NaNites can tell us.  They seem to be based on what AL exports for 
a sound.

All the sound engine really has to do is go boing at the right time. :-)

I don't think sound attenuation is a function of it's volume.  Here is what I 
would do:

Volume/Gain: The loudness of the sound.
Distance: Affects how far a sound carries.
Pitch: Fine.  You're going to have to do DSP to do arbitary pitch shifts.  
Doppler can also tie into this.
Loop points: Good for eg: engine start up ... engine sound ... engine stop
Flags: Looping, 3D

Kester

On Tuesday 28 December 2004 13:25, Alexander Ewering wrote:
> Hi Kester,
>
> thanks for the reply. On the whole, I've found a lot of parameters of
> a SoundObject that are appearently not even editable by the user anywhere.
> Very odd.
>
> For example, where do I, the user, set things like m_rollofffactor,
> m_referencedistance, m_mingain, m_maxgain? I see no sliders for this...
>
> In the end, while I'm already digging into all this, it would be nice
> to know what the sound engine is actually *supposed* to do :)
>
> For me, sensible parameters for a sound are:
>
> Volume: This would be the power of the sound source. The higher it is,
>          the slower it attenuates with distance.
>
>          What is the meaning of the current "Volume" slider? Is it this,
>          or does it actually mean "Gain" (next point)?
>
> Gain:   Maybe! Just an additional absolute scaling factor the sample
>          is multiplied by.
>
> Pitch:  That's already there as a slider, and seems to be meant in
>          semitones. Fine.
>
> Surround Scaling: This is already there, but I'm not sure what is meant.
> To me, it would make sense if it were the factor by which viewer
> orientation relative to the sound source can pan the sound left/right (or
> behind, if we get more esotheric and do stereo phase inversion). If set
> to 1.0, it fully pans. If to 0.0, the sound doesn't pan at all. This is
> useful for doing (especially stereo, ambient) sounds coming from
> everywhere.
>
> I think the whole audio system needs a rethink, so why not start now.
>
> Any other opinions?
>
> | alexander ewering              instinctive mediaworks
> | ae[@]instinctive[.]de   http://www[.]instinctive[.]de
>
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