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

[Daniel PEACOCK]

Hi,

1. I'm guessing you have the EAX 2.0 header file.  EAX 2.0 did not support
the 'Occlusion Direct Ratio' property (it was introduced in EAX 3.0 if I
remember correctly).   For your purposes setting the Occlusion Direct Ratio
parameter to the default value of 1.0 should be fine.

2. I don't think there are any other sources of material presets.  NOTE :
You can probably use the first two values to create Obstruction presets
(e.g EAX_MATERIAL_THINDOOR and EAX_MATERIAL_THINDOORLF).  Exclusion works
differently to Occlusion and Obstruction - it is for simulating sound
entering a room via an aperture.

3. Good question!  If there some acoustic experts on the mailing lists then
maybe they can answer this question - it's probably an entire PhD project
to answer! I would try using the values from the material that attenuates
the sound the most!

Dan
Creative Labs, Inc.

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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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