[Openal] Converting the EAX predifined materials with ConvertOcclusionParameters() to EFX

[Tramboturbiener]

Hi,

1.The file "eax.h" contains material transmission presets, which  can be
used with EAX. I'm looking for such predifined materials for EFX, but I
can't find anything. So I try to convert them with
ConvertOcclusionParameters() function. The struct EAXOCCLUSIONPROPERTIES
expects a parameter: 'flOcclusionDirectRatio', which is not defined in
material preset. 
What should  I set for this parameter? Can I ignore it (or set 0)? 

2. The file "eax.h" contains "only" 8 presets. Are there more presets that
are not listed in this file? Also for Exclusion or Obstruction. Has anybody
experience with?

3. When I have more obstacles on the same path from listener to a source,
one behind the other, what can I do with the LowPassFilter to simulate this?

Thanks!

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