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end7791
New Participant
May 9, 2024
Solved

How to sample IOBT with native openxr and without Unity?

  • May 9, 2024
  • 1 reply
  • 1499 views

Hello. I am new to Quest and XR development.

I have the OpenXR mobile sdk v 64 on my Windows machine, and I can run a sample such as XrBodyFaceEyeSocial as a way to see the body tracking. However, it does not seem to be using IOBT. The only other discussions and samples I can find are using Unity, and I am not planning on using Unity for my intended purpose.

Is there a way to sample this feature (and therefore build my own app) without relying on the Unity engine?

I checked the troubleshooting and it looks like iobt is not active when I run this sample:

adb shell dumpsys activity service com.oculus.bodyapiservice.BodyAPIService\\
SERVICE com.oculus.bodyapiservice/.BodyApiService 83a0fac pid=3858 user=0
  Client:

    <Begin_BodyApiService>
    {
    	"averageHz" : 72.10499841030007,
    	"clients" : 
    	{
    		"com.oculus.xrsamples.xrbodyfaceeyesocial" : null
    	},
    	"expectedHz" : 72.005460382112958,
    	"fbs" : false,
    	"iobt" : false,
    	"num_updates_counter" : 35389,
    	"usingEngineV1" : false
    }

    <End_BodyApiService>
Best answer by end7791

I figured it out. I followed the following steps by adding this code into main.cpp in XrBodyFaceEyeSocial.

In the includes -

 

#include <meta_openxr_preview/meta_body_tracking_fidelity.h>

 

 

In `GetExtenstions()` - 

 

extensions.push_back(XR_META_BODY_TRACKING_FIDELITY_EXTENSION_NAME);

 

 

In the else statement of the coniditional `if (!bodyTrackingSystemProperties.supportsBodyTracking) {` -

 

OXR(xrGetInstanceProcAddr(GetInstance(),"xrRequestBodyTrackingFidelityMETA", (PFN_xrVoidFunction*)(&xrRequestBodyTrackingFidelityMETA_)));

 

 

In `AppShutdown()` -

 

xrRequestBodyTrackingFidelityMETA_ = nullptr;

 

 

In `if (xrCreateBodyTrackerFB_) {` after `OXR(xrCreateBodyTrackerFB_()` -

 

OXR(xrRequestBodyTrackingFidelityMETA_(bodyTracker_, XR_BODY_TRACKING_FIDELITY_HIGH_META));

 

 

This is where the request is made to set the fidelity to high.

Finally, in the `public:` section with the other Body - extension functions -

 

PFN_xrRequestBodyTrackingFidelityMETA xrRequestBodyTrackingFidelityMETA_ = nullptr;

 

 

After this you should be able to type:

 

adb shell dumpsys activity service com.oculus.bodyapiservice.BodyAPIService

 

into a computer connected to the Quest 3 unit to confirm that iobt is set to true when running the sample.

 

1 reply

end7791AuthorAnswer
New Participant
May 13, 2024

I figured it out. I followed the following steps by adding this code into main.cpp in XrBodyFaceEyeSocial.

In the includes -

 

#include <meta_openxr_preview/meta_body_tracking_fidelity.h>

 

 

In `GetExtenstions()` - 

 

extensions.push_back(XR_META_BODY_TRACKING_FIDELITY_EXTENSION_NAME);

 

 

In the else statement of the coniditional `if (!bodyTrackingSystemProperties.supportsBodyTracking) {` -

 

OXR(xrGetInstanceProcAddr(GetInstance(),"xrRequestBodyTrackingFidelityMETA", (PFN_xrVoidFunction*)(&xrRequestBodyTrackingFidelityMETA_)));

 

 

In `AppShutdown()` -

 

xrRequestBodyTrackingFidelityMETA_ = nullptr;

 

 

In `if (xrCreateBodyTrackerFB_) {` after `OXR(xrCreateBodyTrackerFB_()` -

 

OXR(xrRequestBodyTrackingFidelityMETA_(bodyTracker_, XR_BODY_TRACKING_FIDELITY_HIGH_META));

 

 

This is where the request is made to set the fidelity to high.

Finally, in the `public:` section with the other Body - extension functions -

 

PFN_xrRequestBodyTrackingFidelityMETA xrRequestBodyTrackingFidelityMETA_ = nullptr;

 

 

After this you should be able to type:

 

adb shell dumpsys activity service com.oculus.bodyapiservice.BodyAPIService

 

into a computer connected to the Quest 3 unit to confirm that iobt is set to true when running the sample.

 

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