[Openal-devel] _AL_CUTOFF_ATTENUATION

[Sven Panne]

The problem with AL_INVERSE_DISTANCE is the jump from +inf to -inf
around

   distance = referenceDistance * ( 1 - 1 / rolloffFactor )

Probably the gain should stay at a maximum float value when the distance
approaches zero (avoiding a discontinuity), but that is not in the spec.
Sorry for being so picky sometimes, but I need to know what to do to
implement it correctly and consistently with other implementations.

For the curious ones, I've attached a gnuplot batch file and a
PostScript plot showing the effect of the various distance models.

Cheers,
   S.

> -----Original Message-----
> From: Garin Hiebert [mailto:garinh at cheesetoast.net] 
> Sent: Dienstag, 13. Dezember 2005 16:56
> To: Sven Panne
> Cc: OpenAL List
> Subject: Re: [Openal-devel] _AL_CUTOFF_ATTENUATION
> [...]
> Anything approaching infinity should go to max float.  
> Anything going towards zero and then negative gets clamped at 
> zero once the formula goes negative.
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