Steep relative elevation causes sharp filter panning in non-binaural HRTF-spatialised sources
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alareis
Sample world: wrld_aa458f70-972b-494b-9eaf-6f6b1483ca9b
As demonstrated in attached videos, relative elevation sitting at around 45° from horizon causes spatialised non-HRTF sources to hard-pan to dominant direction. This is most likely an issue with the middleware itself.
In theory, these deadzones would be eliminated using post-effects such as Reflections, Reverb mixin, and Transmission, but direct audio should not rapidly change channels like that.
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StormRel
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alareis
After a code review and some litres of ethanol, the issue seems to stem from L2 SH ringing in relative listener position evaluation in the unity plugin.
Try throwing a Hamming window on all axis before it is converted to cartesian, or convert to Zonal Harmonics as per Sloan's whitepaper.