Dev/manipulation physics

XRTK.SDK/Packages/com.xrtk.sdk/Features/Input/Handlers/ManipulationHandler.cs

@@ -345,6 +345,7 @@ public Vector2 NudgeConstraints
 
         private int prevPhysicsLayer;
         private int boundingBoxPrevPhysicsLayer;
+        private SpatialMeshDisplayOptions prevSpatialMeshDisplay;
 
         #region Monobehaviour Implementation
 
@@ -396,6 +397,9 @@ protected override void OnDisable()
 
             if (IsBeingHeld)
             {
+                // We don't pass IsCancelled here because 
+                // it's the intended behaviour to end the hold
+                // if the component is disabled.
                 EndHold();
             }
         }
@@ -716,7 +720,12 @@ public virtual void BeginHold(MixedRealityPointerEventData eventData)
             }
 
             MixedRealityToolkit.InputSystem.PushModalInputHandler(gameObject);
-            MixedRealityToolkit.SpatialAwarenessSystem.SetMeshVisibility(spatialMeshVisibility);
+
+            if (MixedRealityToolkit.SpatialAwarenessSystem != null)
+            {
+                prevSpatialMeshDisplay = MixedRealityToolkit.SpatialAwarenessSystem.SpatialMeshVisibility;
+                MixedRealityToolkit.SpatialAwarenessSystem.SpatialMeshVisibility = spatialMeshVisibility;
+            }
 
             var pointerPosition = primaryPointer.Result.Details.Point;
 
@@ -757,7 +766,10 @@ public virtual void EndHold(bool isCanceled = false)
         {
             if (!IsBeingHeld) { return; }
 
-            MixedRealityToolkit.SpatialAwarenessSystem.SetMeshVisibility(SpatialMeshDisplayOptions.None);
+            if (MixedRealityToolkit.SpatialAwarenessSystem != null)
+            {
+                MixedRealityToolkit.SpatialAwarenessSystem.SpatialMeshVisibility = prevSpatialMeshDisplay;
+            }
 
             primaryPointer.PointerExtent = prevPointerExtent;
             primaryPointer = null;