Spatial Mesh Observer in MRTK3

[Ram1508]

Describe the issue

Hello, I was working on Spatial Mesh concept in MRTK3 and learnt that Spatial Awareness System produced by MRTKv2 services are now replaced by ARMeshManager which consumes XRmeshSystem. MRTKv2 has spatialAwarnessSystem that provides " ResumeObservers()" to to start/restart and "SuspendObservers()" to stop/pause spatial observer.
MRTK3 uses XrMeshSystem which has "GenerateMeshAsync" to generate mesh and the ARMeshManager which consuming XRMeshSystem has "DestroyAllMeshes()" to destroy all the generated mesh.
But is there any functionality same as MRTKv2 for to start or stop the observer. Is there anything I am missing?

Feature area

Existing doc link

https://learn.microsoft.com/en-us/windows/mixed-reality/mrtk-unity/mrtk2/features/spatial-awareness/spatial-awareness-getting-started?view=mrtkunity-2022-05

Additional context

I am using Unity 2021.3.16.f1, Mixed Reality OpenXR Plugin 1.8.0, MRTK3 pre.14

Can anyone guide me?

[AMollis]

Hi @Ram1508 , thank you for the question. I've converted your issue to a discussion topic, and will be tracking down an answer for you.

[AMollis]

@Ram1508 , disabling the ARMeshManager will call stop on the XRMeshSubsystem. Code from ARMeshManager.cs:

        void OnDisable()
        {
            if (m_Subsystem != null && m_Subsystem.running)
                m_Subsystem.Stop();
        }

Is this what you are looking for?

[Ram1508]

@AMollis thanks for the reply, disabling the ARMeshManager stops the XRMeshSubsystem. But I need to change the mesh material w.r.t the display option like visible/occlusive based upon the subsytem status. It is provided by SpatialAwarenessMeshDisplayOptions in MRTKv2.

MRTK3:
ARMeshManager provides access to created meshes.

I changed the mesh material based on the use case.

[AMollis]

The MRTK3 doesn't provide any scripts to help here. I think what you are doing is the right approach for MRTK3.

[AMollis]

You could also try editing the mesh manager's mesh prefab and recreate the mesh object via meshManager.DestroyAllMeshes(). But I haven't tried this out.