fix(Pointer): correctly plot play area cursor based on offset

Previously, the play area cursor would be plotted based on the headset
location within the play area, but this is not the correct behaviour if
the Teleporter script has the `Headset Position Compensation` parameter
unchecked as the headset position should not be taken into
consideration, otherwise the `[CameraRig]` is teleported to the wrong
destination out by the margin of the headset offset.

This fix ensure the teleport option is honoured in the pointer.

Assets/SteamVR_Unity_Toolkit/Scripts/Abstractions/VRTK_DestinationMarker.cs

@@ -44,6 +44,7 @@ public abstract class VRTK_DestinationMarker : MonoBehaviour
 
         protected string invalidTargetWithTagOrClass;
         protected bool checkNavMesh;
+        protected bool headsetPositionCompensation;
 
         public virtual void OnDestinationMarkerEnter(DestinationMarkerEventArgs e)
         {
@@ -73,6 +74,11 @@ public virtual void SetNavMeshCheck(bool state)
             checkNavMesh = state;
         }
 
+        public virtual void SetHeadsetPositionCompensation(bool state)
+        {
+            headsetPositionCompensation = state;
+        }
+
         protected DestinationMarkerEventArgs SeDestinationMarkerEvent(float distance, Transform target, Vector3 position, uint controllerIndex)
         {
             DestinationMarkerEventArgs e;

Assets/SteamVR_Unity_Toolkit/Scripts/Abstractions/VRTK_WorldPointer.cs

@@ -127,9 +127,13 @@ protected virtual void InitPointer()
 
         protected virtual void SetPlayAreaCursorTransform(Vector3 destination)
         {
-            var playAreaPos = new Vector3(playArea.transform.position.x, 0, playArea.transform.position.z);
-            var headsetPos = new Vector3(headset.position.x, 0, headset.position.z);
-            var offset = playAreaPos - headsetPos;
+            var offset = Vector3.zero;
+            if(headsetPositionCompensation)
+            {
+                var playAreaPos = new Vector3(playArea.transform.position.x, 0, playArea.transform.position.z);
+                var headsetPos = new Vector3(headset.position.x, 0, headset.position.z);
+                offset = playAreaPos - headsetPos;
+            }
             playAreaCursor.transform.position = destination + offset;
         }
 

Assets/SteamVR_Unity_Toolkit/Scripts/VRTK_BasicTeleport.cs

@@ -46,6 +46,7 @@ public void InitDestinationSetListener(GameObject markerMaker)
                     worldMarker.DestinationMarkerSet += new DestinationMarkerEventHandler(DoTeleport);
                     worldMarker.SetInvalidTarget(ignoreTargetWithTagOrClass);
                     worldMarker.SetNavMeshCheck(limitToNavMesh);
+                    worldMarker.SetHeadsetPositionCompensation(headsetPositionCompensation);
                 }
             }
         }