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Assets/SteamVR/Scripts/SteamVR_ExternalCamera_LegacyManager.cs

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+//======= Copyright (c) Valve Corporation, All rights reserved. ===============
+//
+// Purpose: Used to render an external camera of vr player (split front/back).
+//
+//=============================================================================
+
+using UnityEngine;
+using System.Collections;
+
+namespace Valve.VR
+{
+    public class SteamVR_ExternalCamera_LegacyManager
+    {
+        public static bool hasCamera { get { return cameraIndex != -1; } }
+
+        public static int cameraIndex = -1;
+
+        private static SteamVR_Events.Action newPosesAction = null;
+
+        public static void SubscribeToNewPoses()
+        {
+            if (newPosesAction == null)
+                newPosesAction = SteamVR_Events.NewPosesAction(OnNewPoses);
+
+            newPosesAction.enabled = true;
+        }
+
+        private static void OnNewPoses(TrackedDevicePose_t[] poses)
+        {
+            if (cameraIndex != -1)
+                return;
+
+            int controllercount = 0;
+            for (int index = 0; index < poses.Length; index++)
+            {
+                if (poses[index].bDeviceIsConnected)
+                {
+                    ETrackedDeviceClass deviceClass = OpenVR.System.GetTrackedDeviceClass((uint)index);
+                    if (deviceClass == ETrackedDeviceClass.Controller || deviceClass == ETrackedDeviceClass.GenericTracker)
+                    {
+                        controllercount++;
+                        if (controllercount >= 3)
+                        {
+                            cameraIndex = index;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}