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> Unreal Engine API Reference > Runtime > HeadMountedDisplay > IXRTrackingSystem > HMDDeviceId

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HMDDeviceId

Device id 0 is reserved for an HMD.

Windows

MacOS

Linux

References

Module	HeadMountedDisplay
Header	/Engine/Source/Runtime/HeadMountedDisplay/Public/IXRTrackingSystem.h
Include	#include "IXRTrackingSystem.h"

Syntax

static const int32 HMDDeviceId = 0;

Remarks

Device id 0 is reserved for an HMD. This should represent the HMD or the first HMD in case multiple HMDs are supported. Other devices can have arbitrary ids defined by each system. If a tracking system does not support tracking HMDs, device ID zero should be treated as invalid.

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