[Openal] Howto use sound obstruction

[Daniel PEACOCK]

Hi Stefan,

Obstruction involves applying a low-pass filter to the direct path of the
3D Sound (while leaving its feed to an environmental reverb unaffected).
To do this using the EFX extension you need to create a Filter object, set
it's type to LOWPASS and set the two parameters according to how much
filtering you would like.    To apply the filter to an AL Source simply
attach it using alSourcei AL_DIRECT_FILTER.

The Creative OpenAL SDK (
http://developer.creative.com/articles/article.asp?cat=1&sbcat=31&top=38&aid=45
 ) includes an example project called "EFXFilter" that shows how this is
done.

Dan
Creative Labs, Inc.

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             Stefan Burghardt                                              
             <burghardt at uni-ko                                             
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                                       [Openal] Howto use sound            
                                       obstruction                         
             07/02/2007 05:14                                              
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Hello members of the mailing list,

what do I need to add an obstacle (like a wall) between the listener and
a sound source into a scene. As far as i see efx should provide
everything or do I even need creativs EFX? Does somebody have sample
code for that (I wasn't able to find any tutorial for that)?

I want to implement a simple scene like on page 136 of the OpenAL
Extension Guide.

Thx in advance,
Stefan
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