MixedRealityToolkit · keveleigh · Sep 24, 2026 · Sep 24, 2026 · Sep 24, 2026
@@ -1,4 +1,4 @@
-// Copyright (c) Mixed Reality Toolkit Contributors
+// Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
 using MixedReality.Toolkit.Input;
@@ -112,7 +112,7 @@ public class MoveObjectByEyeGaze : StatefulInteractable
         /// Limits the Z position of the GameObject to the specified minimum and maximum.
         /// </summary>
         public Vector2 LocalMinMaxZ = new Vector2(float.NegativeInfinity, float.PositiveInfinity);
-        
+
         [Tooltip("Fired when the GameObject is dropped.")]
         [SerializeField]
         private UnityEvent onDrop = null;
@@ -123,7 +123,7 @@ public class MoveObjectByEyeGaze : StatefulInteractable
 
         private bool
             onlyEyeWarpOnRelease =
-                true; // Only warp the currently grabbed target to the current look at location once the user releases the pinch gesture.        
+                true; // Only warp the currently grabbed target to the current look at location once the user releases the pinch gesture.
 
         private float originalTransparency = -1f;
         private bool originalUseGravity = false;
@@ -366,13 +366,13 @@ private bool IsLookingAwayFromTarget()
             // Check whether the user is still looking within the proximity of the target
             float distanceBetweenTargetAndCurrHitPos = Angle_ToCurrHitTarget(gameObject);
 
-            // **Note for potential improvement**: It would be better to make this dependent on the target's boundary 
+            // **Note for potential improvement**: It would be better to make this dependent on the target's boundary
             // instead of its center. The way it is implemented right now may cause problems for large-scale targets.
             return distanceBetweenTargetAndCurrHitPos > minLookAwayDistToEnableEyeWarp;
         }
 
         /// <summary>
-        /// Determine whether the user is looking away from the preview. 
+        /// Determine whether the user is looking away from the preview.
         /// </summary>
         private bool IsLookingAwayFromPreview()
         {
@@ -405,7 +405,7 @@ private bool IsLookingAwayFromPreview()
 
         /// <summary>
         /// Check if the destination is plausible. For example, this means if the target is placeable
-        /// on horizontal surfaces then only show a preview for (more or less) horizontal surfaces. 
+        /// on horizontal surfaces then only show a preview for (more or less) horizontal surfaces.
         /// </summary>
         /// <returns>True if the target can be placed on this surface.</returns>
         private bool IsDestinationPlausible()
@@ -488,10 +488,15 @@ private void DragAndDrop_Start()
                 if (TryGetComponent<Rigidbody>(out var rigidbody))
                 {
                     originalUseGravity = rigidbody.useGravity;
-                    originalDrag = rigidbody.drag;
-
                     rigidbody.useGravity = false;
+
+#if UNITY_6000_0_OR_NEWER
+                    originalDrag = rigidbody.linearDamping;
+                    rigidbody.linearDamping = float.PositiveInfinity;
+#else
+                    originalDrag = rigidbody.drag;
                     rigidbody.drag = float.PositiveInfinity;
+#endif
                 }
             }
         }
@@ -520,7 +525,11 @@ private void DragAndDrop_Finish()
                 if (TryGetComponent<Rigidbody>(out var rigidbody))
                 {
                     rigidbody.useGravity = originalUseGravity;
+#if UNITY_6000_0_OR_NEWER
+                    rigidbody.linearDamping = originalDrag;
+#else
                     rigidbody.drag = originalDrag;
+#endif
                 }
 
                 onDrop.Invoke();

@@ -1,4 +1,4 @@
-// Copyright (c) Mixed Reality Toolkit Contributors
+// Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
 // Disable "missing XML comment" warning for samples. While nice to have, this XML documentation is not required for samples.
@@ -49,7 +49,11 @@ private void LateUpdate()
                 // Reset any velocity from falling or moving when re-spawning to original location
                 if (rigidBody != null)
                 {
+#if UNITY_6000_0_OR_NEWER
+                    rigidBody.linearVelocity = Vector3.zero;
+#else
                     rigidBody.velocity = Vector3.zero;
+#endif
                     rigidBody.angularVelocity = Vector3.zero;
                 }
 

@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 * Fixed "The type `MixedReality.Toolkit.Core MixedReality.Toolkit.Experimental.BubbleChildHoverEvents/TrickleChildHoverEvents/BubbleChildSelectEvents/TrickleChildSelectEvents` is being serialized by `[SerializeReference]`, but is missing the `[Serializable]` attribute." on Unity 6.3. [PR #1107](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1107)
 * Fixed object identity API usages and obsolete sorting warnings for Unity 6.4 and newer in `FindObjectUtility`. [PR #1136](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1136)
+* Fixed incomplete serialization hierarchy warnings (UAC1002) in Unity 6 for `InteractableEventRoute`, `InteractableParentEventRoute`, and `InteractableChildrenEventRoute` in `InteractableEventRouter`. [PR #1137](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1137)
 
 ## Deprecated
 

@@ -1,4 +1,4 @@
-// Copyright (c) Mixed Reality Toolkit Contributors
+// Copyright (c) Mixed Reality Toolkit Contributors
 // Licensed under the BSD 3-Clause
 
 using System;
@@ -496,6 +496,7 @@ public interface IXRSelectInteractableChild : IXRInteractableEventRouteTarget
     /// For these types of features, we want the community to see them and get
     /// value out of them early enough so to provide feedback.
     /// </remarks>
+    [Serializable]
     public abstract class InteractableEventRoute<S, T> : IXRInteractableEventRoute
         where S : IXRInteractable
         where T : IXRInteractableEventRouteTarget
@@ -630,6 +631,7 @@ private void FilterTargets(GameObject origin, List<T> targets)
     /// For these types of features, we want the community to see them and get
     /// value out of them early enough so to provide feedback.
     /// </remarks>
+    [Serializable]
     public abstract class InteractableParentEventRoute<S, T> : InteractableEventRoute<S, T>
         where S : IXRInteractable
         where T : IXRInteractableEventRouteTarget
@@ -668,6 +670,7 @@ protected override void GetTargets(GameObject origin, List<T> targets)
     /// For these types of features, we want the community to see them and get
     /// value out of them early enough so to provide feedback.
     /// </remarks>
+    [Serializable]
     public abstract class InteractableChildrenEventRoute<S, T> : InteractableEventRoute<S, T>
         where S : IXRInteractable
         where T : IXRInteractableEventRouteTarget

@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 * Fixed "leaked managed shell" issue in `InteractionModeManager`. [PR #1096](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1096)
 * Fixed `EyeCalibrationChecker` build issue on UWP when the Mixed Reality OpenXR Plugin wasn't installed. [PR #1106](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1106)
 * Fixed object identity API usages for Unity 6.4 and newer in `InteractionModeManagerEditor`. [PR #1136](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1136)
+* Fixed incomplete serialization hierarchy warning (UAC1002) in Unity 6 by adding `[Serializable]` to `HandBasedPoseSource`. [PR #1137](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1137)
 
 ## [3.3.0] - 2025-11-12
 

@@ -10,6 +10,7 @@ namespace MixedReality.Toolkit.Input
     /// <summary>
     /// Helps define a pose source that's based on a specific handedness with access to the current <see cref="HandsAggregatorSubsystem"/>.
     /// </summary>
+    [Serializable]
     public abstract class HandBasedPoseSource : IPoseSource
     {
         /// <summary>

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 * Fixed "leaked managed shell" issue in `BoundsCalculator`. [PR #1096](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1096)
 * Fixed object identity API usages for Unity 6.4 and newer in `ConstraintManagerEditor`. [PR #1136](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1136)
+* Fixed obsolete physics property warnings on Unity 6 and newer in `ObjectManipulator`. [PR #1137](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1137)
 
 ### Changed
 

@@ -760,7 +760,11 @@ protected override void OnSelectExited(SelectExitEventArgs args)
                 {
                     if (interactorsSelecting.Count == 0)
                     {
+#if UNITY_6000_0_OR_NEWER
+                        ReleaseRigidBody(rigidBody.linearVelocity, rigidBody.angularVelocity);
+#else
                         ReleaseRigidBody(rigidBody.velocity, rigidBody.angularVelocity);
+#endif
                     }
                     else
                     {
@@ -908,7 +912,11 @@ private void ApplyForcesToRigidbody()
             // when player is moving, we need to anticipate where the targetTransform is going to be one time step from now
             distance -= referenceFrameVelocity * Time.fixedDeltaTime;
 
+#if UNITY_6000_0_OR_NEWER
+            var velocity = rigidBody.linearVelocity;
+#else
             var velocity = rigidBody.velocity;
+#endif
 
             var acceleration = omega * omega * -distance;  // acceleration caused by spring force
 
@@ -937,7 +945,11 @@ private void ApplyForcesToRigidbody()
 
             velocity += referenceFrameVelocity;  // change back to global frame of reference
 
+#if UNITY_6000_0_OR_NEWER
+            rigidBody.linearVelocity = velocity;
+#else
             rigidBody.velocity = velocity;
+#endif
 
             if (applyTorque)
             {
@@ -1035,7 +1047,11 @@ private void ReleaseRigidBody(Vector3 velocity, Vector3 angularVelocity)
                 {
                     if (releaseBehavior.IsMaskSet(ReleaseBehaviorType.KeepVelocity))
                     {
+#if UNITY_6000_0_OR_NEWER
+                        rigidBody.linearVelocity = velocity;
+#else
                         rigidBody.velocity = velocity;
+#endif
                     }
 
                     if (releaseBehavior.IsMaskSet(ReleaseBehaviorType.KeepAngularVelocity))

@@ -987,7 +987,11 @@ public IEnumerator ObjectManipulatorRigidbodyCollision()
             yield return hand.Move(Vector3.forward * 3f);
             yield return RuntimeTestUtilities.WaitForFixedUpdates();
 
+#if UNITY_6000_0_OR_NEWER
+            Assert.AreNotEqual(Vector3.zero, backgroundRigidbody.linearVelocity);
+#else
             Assert.AreNotEqual(Vector3.zero, backgroundRigidbody.velocity);
+#endif
             Assert.AreEqual(1, collisionListener.CollisionCount);
         }
 
@@ -1228,7 +1232,11 @@ public IEnumerator ObjectManipulatorNearThrow()
            // With simulated hand angular velocity would not be equal to 0, because of how simulation
            // moves hand when releasing the Pitch. Even though it doesn't directly follow from hand movement, there will always be some rotation.
            // Assert.NotZero(rigidBody.angularVelocity.magnitude, "ObjectManipulator should apply angular velocity to rigidBody upon release.");
+#if UNITY_6000_0_OR_NEWER
+           Assert.AreEqual(hand.GetVelocity(), rigidBody.linearVelocity, "ObjectManipulator should apply hand velocity to rigidBody upon release.");
+#else
            Assert.AreEqual(hand.GetVelocity(), rigidBody.velocity, "ObjectManipulator should apply hand velocity to rigidBody upon release.");
+#endif
 
            // This is just for debugging purposes, so object's movement after release can be seen.
            yield return hand.MoveTo(initialHandPosition);