[Unity] 2nd order ambisonic silent with Vive3DSP ambisonic decoder

[albrt]

Hello,

Playing 1st order ambisonic works, however my 2nd order ambisonic file is silent when Vive3DSP Spatialiser is set as the ambisonic decoder.

Here are the steps to reproduce the issue:

1) Create a new Unity project (I tried 2019.4.17, 2019.4.21 LTS and 2020.2.3)
2) Import this 2nd order ambisonic audio file
3) Click on the audio file to show the inspector window
4) Tick the "Ambisonic" check-box
5) Play the audio preview in the inspector - you can hear the audio

6) Import Vive3DSP_v1.2.2.0 package
7) Set the Ambisonic decoder plugin to VIVE3DSP (as prompted by the Vive Input Utility window)
8)Play the audio preview in the inspector - audio is silent
8.1) Play the 2nd order ambisonic audio in the 0.3DSound(DistanceMode) scene - audio is silent

9) In Edit > Project Settings > Audio, set the Ambisonic Decoder to "None"
10) Play the audio preview in the inspector - you can hear the audio again
11) Set the Ambisonic Decoder to Vive 3DSP spatialiser again
12) Play the audio preview in the inspector - audio is silent again

Is Vive3DSP Spatialiser not supporting 2nd order ambisonics?
I couldn't find this mentioned in the official documentation.

Thank you for your help @Professor 3DSound

 

[Professor 3DSound]

Hi albrt,

Thank you for your valuable feedback.

VIVE 3DSP can perform the 3rd order ambisonic on "spatializer plugin" (including encoder/decoder).

However, for ambiX file, the current version of VIVE 3DSP only supports 1st order ambisonic decoder.

So if you import 2nd order ambisonic file, it will get the abnormal result.

For the long-term solution, we are considering and planning to provide the higher order ambisonic decoder for the application in the feature.

And we will also remark the limitation in the official document.

Best regards,

3D Sound Group.