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fix: in-scene networkobject with networktransform synchronization when parented under gameobject [MTT-8402] (#2895)
* fix Fixing issue where parenting synchronization on the authority side was not properly handling the scenario where a NetworkObject is parented under a GameObject (with or without auto object parent sync enabled). * fix Fixing issue where parenting synchronization on the non-authority side was not properly handling the scenario where a NetworkObject is parented under a GameObject (with or without auto object parent sync enabled). * update migrate when to apply in local space above the parenting check. * test Adding an integration test to validate an in-scene placed NetworkObject's initial synchronization when parented under a GameObject. This also test both scenarios where the in-scene placed NetworkObject does and does not have a NetworkTransform. * style Removing unused namespace * update Updating change log entry
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‎com.unity.netcode.gameobjects/CHANGELOG.md‎

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@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).
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## [Unreleased]
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### Added
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### Fixed
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- Fixed issue where an in-scene placed `NetworkObject` with `NetworkTransform` that is also parented under a `GameObject` would not properly synchronize when the parent `GameObject` had a world space position other than 0,0,0. (#2895)
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### Changed
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## [Unreleased]
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‎com.unity.netcode.gameobjects/Components/NetworkTransform.cs‎

Lines changed: 20 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1682,6 +1682,15 @@ private bool ApplyTransformToNetworkStateWithInfo(ref NetworkTransformState netw
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var scale = transformToUse.localScale;
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networkState.IsSynchronizing = isSynchronization;
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// All of the checks below, up to the delta position checking portion, are to determine if the
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// authority changed a property during runtime that requires a full synchronizing.
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if (InLocalSpace != networkState.InLocalSpace)
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{
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networkState.InLocalSpace = InLocalSpace;
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isDirty = true;
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networkState.IsTeleportingNextFrame = true;
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}
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// Check for parenting when synchronizing and/or teleporting
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if (isSynchronization || networkState.IsTeleportingNextFrame)
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{
@@ -1691,11 +1700,13 @@ private bool ApplyTransformToNetworkStateWithInfo(ref NetworkTransformState netw
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// values are applied.
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var hasParentNetworkObject = false;
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var parentNetworkObject = (NetworkObject)null;
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// If the NetworkObject belonging to this NetworkTransform instance has a parent
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// (i.e. this handles nested NetworkTransforms under a parent at some layer above)
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if (NetworkObject.transform.parent != null)
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{
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var parentNetworkObject = NetworkObject.transform.parent.GetComponent<NetworkObject>();
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parentNetworkObject = NetworkObject.transform.parent.GetComponent<NetworkObject>();
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// In-scene placed NetworkObjects parented under a GameObject with no
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// NetworkObject preserve their lossyScale when synchronizing.
@@ -1716,28 +1727,25 @@ private bool ApplyTransformToNetworkStateWithInfo(ref NetworkTransformState netw
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// the NetworkTransform is using world or local space synchronization.
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// WorldPositionStays: (always use world space)
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// !WorldPositionStays: (always use local space)
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if (isSynchronization)
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// Exception: If it is an in-scene placed NetworkObject and it is parented under a GameObject
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// then always use local space unless AutoObjectParentSync is disabled and the NetworkTransform
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// is synchronizing in world space.
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if (isSynchronization && networkState.IsParented)
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{
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if (NetworkObject.WorldPositionStays())
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var parentedUnderGameObject = NetworkObject.transform.parent != null && !parentNetworkObject && NetworkObject.IsSceneObject.Value;
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if (NetworkObject.WorldPositionStays() && (!parentedUnderGameObject || (parentedUnderGameObject && !NetworkObject.AutoObjectParentSync && !InLocalSpace)))
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{
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position = transformToUse.position;
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networkState.InLocalSpace = false;
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}
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else
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{
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position = transformToUse.localPosition;
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networkState.InLocalSpace = true;
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}
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}
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}
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// All of the checks below, up to the delta position checking portion, are to determine if the
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// authority changed a property during runtime that requires a full synchronizing.
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if (InLocalSpace != networkState.InLocalSpace)
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{
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networkState.InLocalSpace = InLocalSpace;
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isDirty = true;
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networkState.IsTeleportingNextFrame = true;
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}
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if (Interpolate != networkState.UseInterpolation)
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{
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networkState.UseInterpolation = Interpolate;

‎com.unity.netcode.gameobjects/Runtime/Spawning/NetworkSpawnManager.cs‎

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@@ -531,20 +531,27 @@ internal NetworkObject CreateLocalNetworkObject(NetworkObject.SceneObject sceneO
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networkObject.DestroyWithScene = sceneObject.DestroyWithScene;
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networkObject.NetworkSceneHandle = sceneObject.NetworkSceneHandle;
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var nonNetworkObjectParent = false;
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// SPECIAL CASE FOR IN-SCENE PLACED: (only when the parent has a NetworkObject)
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// This is a special case scenario where a late joining client has joined and loaded one or
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// more scenes that contain nested in-scene placed NetworkObject children yet the server's
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// synchronization information does not indicate the NetworkObject in question has a parent.
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// Under this scenario, we want to remove the parent before spawning and setting the transform values.
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if (sceneObject.IsSceneObject && !sceneObject.HasParent && networkObject.transform.parent != null)
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if (sceneObject.IsSceneObject && networkObject.transform.parent != null)
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{
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var parentNetworkObject = networkObject.transform.parent.GetComponent<NetworkObject>();
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// if the in-scene placed NetworkObject has a parent NetworkObject but the synchronization information does not
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// include parenting, then we need to force the removal of that parent
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if (networkObject.transform.parent.GetComponent<NetworkObject>() != null)
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if (!sceneObject.HasParent && parentNetworkObject)
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{
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// remove the parent
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networkObject.ApplyNetworkParenting(true, true);
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}
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else if (sceneObject.HasParent && !parentNetworkObject)
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{
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nonNetworkObjectParent = true;
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}
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}
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// Set the transform unless we were spawned by a prefab handler
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{
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// If world position stays is true or we have auto object parent synchronization disabled
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// then we want to apply the position and rotation values world space relative
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if (worldPositionStays || !networkObject.AutoObjectParentSync)
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if ((worldPositionStays && !nonNetworkObjectParent) || !networkObject.AutoObjectParentSync)
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{
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networkObject.transform.position = position;
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networkObject.transform.rotation = rotation;

‎testproject/Assets/Tests/Manual/IntegrationTestScenes/InSceneUnderGameObject.unity‎

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‎testproject/Assets/Tests/Manual/IntegrationTestScenes/InSceneUnderGameObject.unity.meta‎

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