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Assets/VRTemplateAssets/Scripts/HandSubsystemManager.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.XR.Hands;
+
+namespace Unity.VRTemplate
+{
+    /// <summary>
+    /// This class is a convenience wrapper to handle external start/stop
+    /// of a currently running XR Hand Subsystem.
+    /// </summary>
+    /// <seealso cref="XRHandSubsystem"/>
+    public class HandSubsystemManager : MonoBehaviour
+    {
+        static List<XRHandSubsystem> s_HandSubsystems;
+        XRHandSubsystem m_HandSubsystem;
+
+        void OnEnable()
+        {
+            if (m_HandSubsystem == null)
+            {
+                TryGetHandSubsystem(out m_HandSubsystem);
+            }
+        }
+
+        /// <summary>
+        /// This function will attempt to find a currently running hand tracking subsystem and stop it.
+        /// </summary>
+        /// <seealso cref="XRHandSubsystem"/>
+        public void DisableHandTracking()
+        {
+            if (m_HandSubsystem != null || TryGetHandSubsystem(out m_HandSubsystem))
+            {
+                m_HandSubsystem.Stop();
+            }
+        }
+
+        /// <summary>
+        /// This function will attempt to find a current hand tracking subsystem and start it up.
+        /// </summary>
+        /// <seealso cref="XRHandSubsystem"/>
+        public void EnableHandTracking()
+        {
+            if (m_HandSubsystem != null || TryGetHandSubsystem(out m_HandSubsystem))
+            {
+                m_HandSubsystem.Start();
+            }
+        }
+
+        // This is taken from XRInputTrackingAggregator and should be removed once the internal version
+        // has been made publicly available.
+        static bool TryGetHandSubsystem(out XRHandSubsystem handSubsystem)
+        {
+            s_HandSubsystems ??= new List<XRHandSubsystem>();
+            SubsystemManager.GetSubsystems(s_HandSubsystems);
+            if (s_HandSubsystems.Count == 0)
+            {
+                handSubsystem = default;
+                return false;
+            }
+
+            if (s_HandSubsystems.Count > 1)
+            {
+                for (var i = 0; i < s_HandSubsystems.Count; ++i)
+                {
+                    handSubsystem = s_HandSubsystems[i];
+                    if (handSubsystem.running)
+                        return true;
+                }
+            }
+
+            handSubsystem = s_HandSubsystems[0];
+            return true;
+        }
+    }
+}