DOTS Multiplayer discussion

Thank you for your answer !
I think I understand. But just for clarification, an example :

I have Units (they move in 20% of the time and have ghost components like health that changes often) -> dynamic send mode

and I have Items (multiple per unit possible, they are their own ghosts, but they are only needed for data, their position is irrelevant, they only appear on UI, also their values rarely change) -> static send mode ?

 

@timjohansson

my frames per seconds is 200 +.
I still have these prediction errors. To prove this I made video. Also you QA was unwilling to pass this bug forward claiming you don't support openvr when clearly this is not an openvr issue.

 

@timjohansson just want to double check what you would suggest as a workflow for a predicted-client only component (like a camera)
- server spawns player prefab
- client checks for predicted component
- client instantiates a prefab and adds it as a child its the player prefab

Code (CSharp):

1.         var playerEntity = GetSingletonEntity<NetworkIdComponent>();
2.         var commandTargetFromEntity = GetComponentDataFromEntity<CommandTargetComponent>(false);
3.         var commandBuffer = m_BeginSimEcb.CreateCommandBuffer().AsParallelWriter();
4.         var childFromEntity = GetBufferFromEntity<Child>();
5.         Entities
6.             .WithoutBurst()
7.             .WithNone<GhostPlayerState>()
8.             .WithAll<PlayerTag, PredictedGhostComponent>()
9.             .WithNativeDisableParallelForRestriction(commandTargetFromEntity)
10.             .ForEach((Entity entity, int entityInQueryIndex) =>
11.             {
12.             var state = commandTargetFromEntity[playerEntity];
13.             state.targetEntity = entity;
14.             commandTargetFromEntity[playerEntity] = state;
15.             commandBuffer.AddComponent(entityInQueryIndex, entity, new GhostPlayerState());
16.          
17.             //Is this how I can add a camera to a predicted-client prefab?
18.             var camera = commandBuffer.Instantiate(cameraPrefab);
19.             var children = childFromEntity[entity];
20.             children.Add(camera);
21.         }).ScheduleParallel();

Or did I mis-interpret?

I receive this error: "Argument 1: cannot convert from 'Unity.Entities.Entity' to 'Unity.Transforms.Child'"

 

This is the getting started example. Its default settings basically, so yea client server. I imported steamVr from asset store. I made a thread about it long time a go.
https://forum.unity.com/threads/unity-dots-netcode-getting-started-issues.1007990/#post-6600757

 

I have two more general questions regarding conversion and netcode :
ConvertToClientServerEntity is deprecated > use Subscene workflow instead.

- What is the intended workflow for hybrids that cannot be in a subscene ? (because for example they have a reference to a scriptable object, there are other reasons too IMO)

- What if I only want to load a specific subscene on server OR client ? (I don't see such a setting, is it intended to write that manually by reading scripting define UNITY_SERVER for example and don't auto load subscene ?)

Bonus question : How to load a subscene the intended way when disabling auto load

 

I was wondering this too.

came up with this horrible solution!

Code (CSharp):

1.  
2.             serverStart = World.DefaultGameObjectInjectionWorld.GetExistingSystem<GameInitConnection>();
3.             serverStart.MultiPlayerGameStarted = true;
4.             serverStart.Update();
5.             server = ServerWorld.GetExistingSystem<GoInGameServerSystem>();
6.             server.MultiPlayerGameStarted = true;
7.             server.Update();
8.             client = ClientWorld.GetOrCreateSystem<GoInGameClientSystem>();
9.             client.MultiPlayerGameStarted = true;
10.             client.Update();
11.  
12.             GetComponent<LoadNetCodeSystemAndSubScene>().NetWorkScene.gameObject.GetComponent<SubScene>().enabled =  true;

What I think is horrible about this is that I'm manually building, updating and managing the ecs systems. Bonus points for easy reading and easy usage.

 

@11marcello11 I had similar questions, check out this post and the following ones. I think they answer most of your questions
https://forum.unity.com/threads/generate-sub-scenes-programmatically.868984/#post-6598072

 

thanks for the link, didn't spot that

It answers the concrete implementation question, but it leaves the questions :

- Is this really intended ? (Seems just to error prone to write a manual component like that, why not have a ClientServerSubscene provided by unity ? )

- What's with conversion outside of a subscene ? Is it really intended to NOT have any conversion outside of subscenes anymore ?

 

I think it would be a really good time to have updated and detailed information about what the new conversion workflow should look like when using Unity NetCode.
(I humbly appologize if such a thing exists, in that case i didn't find it easy enough, the netcode documentation package doesn't address this)

It seems odd to browse several forums, discord servers and documentation pages to gather basic informations.

I really like pages like
https://docs.unity3d.com/Packages/com.unity.tiny@0.16/manual/intro-for-unity-developers.html
https://docs.unity3d.com/Packages/com.unity.entities@0.16/manual/conversion.html

would be awesome to find more informations about conversion workflow (with and without netcode involved) there

 

In case anyone needs this too : Simple ClientServerSubscene that will only load if server or client world exists

Code (CSharp):

1.  /// <summary>
2.   /// Helps loading a subscene only on server or client.
3.   /// This is basically ConvertToClientServerEntity code.
4.   /// </summary>
5.   [DisallowMultipleComponent]
6.   [RequireComponent(typeof(SubScene))]
7.   public class ClientServerSubscene : MonoBehaviour
8.   {
9.     [Flags]
10.     public enum ConversionTargetType
11.     {
12.       None = 0x0,
13.       Client = 0x1,
14.       Server = 0x2,
15.       ClientAndServer = 0x3
16.     }
17.  
18.     [SerializeField] public ConversionTargetType ConversionTarget = ConversionTargetType.ClientAndServer;
19.  
20.     private void Reset()
21.     {
22.       //we only want to load with TryLoad(), not automatic.
23.       GetComponent<SubScene>().AutoLoadScene = false;
24.     }
25.  
26.     void Start()
27.     {
28.       TryLoad();
29.     }
30.  
31.     public void TryLoad()
32.     {
33.       foreach (var world in World.All)
34.       {
35.         bool convertToClient = world.GetExistingSystem<ClientSimulationSystemGroup>() != null;
36.         bool convertToServer = world.GetExistingSystem<ServerSimulationSystemGroup>() != null;
37.  
38.         convertToClient &= (ConversionTarget & ConversionTargetType.Client) != 0;
39.         convertToServer &= (ConversionTarget & ConversionTargetType.Server) != 0;
40.  
41.         if
42.         (
43.           convertToClient ||
44.           convertToServer
45.         )
46.         {
47.           var sceneSystem = world.GetExistingSystem<SceneSystem>();
48.           sceneSystem.LoadSceneAsync(GetComponent<SubScene>().SceneGUID);
49.         }
50.       }
51.     }
52.   }

 

If I remember correctly the rpc codegen supports fixed strings

 

@timjohansson is it possible to create an entity in the client/server world directly from a Monobehaviour?

I override bootstrap to create client and server worlds with:

Code (CSharp):

1. ClientServerBootstrap.CreateServerWorld(world, "ServerWorld");
2. ClientServerBootstrap.CreateClientWorld(world, "ClientWorld");

On start up the system that listens on a port "ServerConnectionControl" is limited to TargetWorld.Server:

Code (CSharp):

1. [UpdateInWorld(UpdateInWorld.TargetWorld.Server)]
2. public class ServerConnectionControl : SystemBase

Is there a similar way to create a Entity from a Monobehaviour into the server world?

var ServerDataEntity = World.Server.EntityManager.CreateEntity();

returns

'World' does not contain a definition for 'Server'

Currently I have to: if(word in worlds.all) has ClientSimulationSystemGroup each time I need to be specifically in the client world.

 

@timjohansson

I have yet another question that might be hard to answer

The situation :
- 100 ghosts (units)
of which following components are ghostcomponents
- health
- mana
- weaponstate
- animationstate
and around 10-15 additional components which only exist on server (like armor, speed, resistance, range, etc.)

but here comes the thing : I wrote a small AI with ECS (very simple state machine) that adds
components to those ghosts like DoAttack, DoMove, DoRangeCheck and so on (there are 12 different AI 'nodes').

This means that usually the chunks change quite a bit because of those AI components on the unit ghosts, do you see a problem with that ? (and in generall, is it a problem to have that many components on a ghost that are not ghostcomponents ?)

Below i attached a fatal error that occurs when i instantiate 24 unit-ghosts in a job. The system reporting the issue is random (in this case it was my CalcPlayerTargetUnitsServerSystem, but sometimes its the GhostUpdateSystem).
I was wondering wether that issue has something to do with my setup described above.

Spoiler: stacktrace error

NullReferenceException: Object reference not set to an instance of an object
Unity.Entities.ArchetypeChunk.GetNativeArray (Unity.Entities.EntityTypeHandle entityTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ArchetypeChunkArray.cs:220)
Unity.Entities.ChunkIterationUtility._GatherEntities (Unity.Entities.Entity* entities, Unity.Entities.EntityQuery& entityQuery, Unity.Entities.EntityTypeHandle& entityTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ChunkIterationUtility.cs:258)
Unity.Entities.ChunkIterationUtility._mono_to_burst_GatherEntities (System.IntPtr entities, Unity.Entities.EntityQuery& entityQuery, Unity.Entities.EntityTypeHandle& entityTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ChunkIterationUtility.interop.gen.cs:193)
Unity.Entities.ChunkIterationUtility._forward_mono_GatherEntities (Unity.Entities.Entity* entities, Unity.Entities.EntityQuery& entityQuery, Unity.Entities.EntityTypeHandle& entityTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ChunkIterationUtility.interop.gen.cs:199)
Unity.Entities.ChunkIterationUtility.GatherEntities (Unity.Entities.Entity* entities, Unity.Entities.EntityQuery& entityQuery, Unity.Entities.EntityTypeHandle& entityTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ChunkIterationUtility.interop.gen.cs:180)
Unity.Entities.ChunkIterationUtility.CreateEntityArray (Unity.Entities.UnsafeMatchingArchetypePtrList matchingArchetypes, Unity.Collections.Allocator allocator, Unity.Entities.EntityTypeHandle typeHandle, Unity.Entities.EntityQuery entityQuery, System.Int32 entityCount) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ChunkIterationUtility.cs:284)
Unity.Entities.EntityQueryImpl.ToEntityArray (Unity.Collections.Allocator allocator, Unity.Entities.EntityQuery outer) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/EntityQuery.cs:490)
Unity.Entities.EntityQuery.ToEntityArray (Unity.Collections.Allocator allocator) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/EntityQuery.cs:1283)
FFE.Combat.CalcPlayerTargetUnitsServerSystem.OnUpdate () (at Assets/Scripts/Combat/Runtime/Systems/ServerOnly/CalcPlayerTargetUnitsServerSystem.cs:31)
Unity.Entities.SystemBase.Update () (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/SystemBase.cs:413)
Unity.Entities.ComponentSystemGroup.UpdateAllSystems () (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
UnityEngine.Debug:LogException(Exception)
Unity.Debug:LogException(Exception) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Stubs/Unity/Debug.cs:19)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:440)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.NetCode.ServerSimulationSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.netcode@0.5.0-preview.5/Runtime/ClientServerWorld/ServerSimulationSystemGroup.cs:72)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.DummyDelegateWrapper:TriggerUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ScriptBehaviourUpdateOrder.cs:333)

Spoiler: stracktrace error 2 (appears together with the one above)

NullReferenceException: Object reference not set to an instance of an object
Unity.Entities.ChunkDataUtility.GetIndexInTypeArray (Unity.Entities.Archetype* archetype, System.Int32 typeIndex) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ChunkDataUtility.cs:65)
Unity.Entities.ArchetypeChunk.GetChangeVersion[T] (Unity.Entities.ComponentTypeHandle`1[T] chunkComponentTypeHandle) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ArchetypeChunkArray.cs:396)
Unity.Entities.ArchetypeChunk.DidChange[T] (Unity.Entities.ComponentTypeHandle`1[T] chunkComponentTypeHandle, System.UInt32 version) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/Iterators/ArchetypeChunkArray.cs:258)
Unity.Transforms.LocalToParentSystem+UpdateHierarchy.Execute (Unity.Entities.ArchetypeChunk chunk, System.Int32 index, System.Int32 entityOffset) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Transforms/LocalToParentSystem.cs:60)
Unity.Entities.JobChunkExtensions+JobChunkProducer`1[T].ExecuteInternal (Unity.Entities.JobChunkExtensions+JobChunkWrapper`1[T]& jobWrapper, System.IntPtr bufferRangePatchData, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/IJobChunk.cs:370)
Unity.Entities.JobChunkExtensions+JobChunkProducer`1[T].Execute (Unity.Entities.JobChunkExtensions+JobChunkWrapper`1[T]& jobWrapper, System.IntPtr additionalPtr, System.IntPtr bufferRangePatchData, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/IJobChunk.cs:337)
Unity.Jobs.JobHandle:ScheduleBatchedJobsAndComplete(JobHandle&)
Unity.Jobs.JobHandle:Complete()
Unity.Entities.ComponentDependencyManager:CompleteAllJobsAndInvalidateArrays() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentDependencyManager.cs:129)
Unity.Entities.EntityDataAccess:BeforeStructuralChange() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityDataAccess.cs:285)
Unity.Entities.EntityCommandBuffer:StartTrackingChanges(EntityDataAccess*, UnsafeList*, ArchetypeChanges&) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityCommandBuffer.cs:2127)
Unity.Entities.EntityCommandBufferlaybackInternal(EntityDataAccess*) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityCommandBuffer.cs:1411)
Unity.Entities.EntityCommandBufferlayback(EntityManager) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityCommandBuffer.cs:1369)
Unity.Entities.EntityCommandBufferSystem:FlushPendingBuffers(Boolean) (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityCommandBufferSystem.cs:225)
Unity.Entities.EntityCommandBufferSystem:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/EntityCommandBufferSystem.cs:190)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.NetCode.ServerSimulationSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.netcode@0.5.0-preview.5/Runtime/ClientServerWorld/ServerSimulationSystemGroup.cs:72)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.ComponentSystemGroup:UpdateAllSystems() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:435)
Unity.Entities.ComponentSystemGroup:OnUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystemGroup.cs:387)
Unity.Entities.ComponentSystem:Update() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ComponentSystem.cs:113)
Unity.Entities.DummyDelegateWrapper:TriggerUpdate() (at Library/PackageCache/com.unity.entities@0.16.0-preview.21/Unity.Entities/ScriptBehaviourUpdateOrder.cs:333)

 

FYI anyone else that is getting "jittering" when changing PhysicsVelocity

After fiddling with NetCode + Physics for a quite a while I learned that you should not put your system that responds to commands in: [UpdateInGroup(typeof(GhostPredictionSystemGroup))] even though it seems like you should.

You would think you should, but it is only used for the predicting tick. If you try to put your input response system in here you will get all sorts of issues.

It is better to bail and not use PhysicsVelocity.Linear at all in your project if you are using NetCode + Physics

You can create a VelocityComponent

Code (CSharp):

1. using Unity.Entities;
2. using Unity.Mathematics;
3. using Unity.NetCode;
4.  
5. // [GhostComponent(PrefabType = GhostPrefabType.AllPredicted, OwnerPredictedSendType = GhostSendType.Predicted)]
6. [GenerateAuthoringComponent]
7. public struct VelocityComponent : IComponentData
8. {
9.     [GhostField]
10.     public float3 Linear;
11. }
12.  

And a MovementSystem

Code (CSharp):

1. using Unity.Entities;
2. using Unity.Mathematics;
3. using Unity.Transforms;
4. using UnityEngine;
5. using Unity.Burst;
6. using Unity.NetCode;
7.  
8. [UpdateInWorld(UpdateInWorld.TargetWorld.ClientAndServer)]
9. [UpdateInGroup(typeof(GhostPredictionSystemGroup))]
10. public class MovementSystem : SystemBase
11. {
12.     private GhostPredictionSystemGroup m_PredictionGroup;
13.  
14.     protected override void OnCreate()
15.     {
16.         m_PredictionGroup = World.GetOrCreateSystem<GhostPredictionSystemGroup>();
17.     }
18.  
19.     protected override void OnUpdate()
20.     {
21.         var deltaTime = m_PredictionGroup.Time.DeltaTime;
22.         var currentTick = m_PredictionGroup.PredictingTick;
23.  
24.         Entities
25.         .ForEach((ref Translation position, in VelocityComponent velocity, in PredictedGhostComponent prediction) =>
26.         {
27.             if (!GhostPredictionSystemGroup.ShouldPredict(currentTick, prediction))
28.                 return;
29.  
30.             position.Value.xyz += velocity.Linear * deltaTime;
31.            
32.         }).ScheduleParallel();
33.     }
34. }

The collisions won't be perfect but its better than unusable movement

 

@timjohansson
Thanks for your insights

FYI : I filed a unity bug report a week ago, i got rid of those errors by reverting entities 0.16 to 0.14 and netcode 0.5 to 0.4.

Edit : will try upgrading packages and disabling distance partitioning and test it as soon as I have time, thanks for the hint

 

Super helpful thank you @timjohansson

Is there anyway to adjust PhysicsVelocity with DOTS Physics + NetCode?

I am currently using my own VelocityComponent and MovementSystem but it makes for not great collisions with Physics Shapes.

How can I "add thrust" to an object (increase the PhysicsVelocity.Linear) without the "stuttering"?

Currently when I try to update PhysicsVelocity.Linear it gets "jittery" and I have pinpointed it to the PhysicsVelocity.Linear randomly decreasing and then going back to normal



(using Physics.Extensions linear impulses didn't work either)

 

When physics sim in prediction feature will land? Soon or still long time to go?

 

Sorry for being unclear @timjohansson .

I meant I have a predicted-player object (the capsule in the video). I want to increase its PhysicsVelocity.Linear (or the appropriate equivalent) when I hit "W" on my keyboard. So which ever way it is facing, it will accelerate in that direction.

Currently I store a "thrust == 1" ICommandData and I play it back in my InputResponseSystem (which is run on both the client and server similar to the "SteeringSystem" in the Asteroids sample.

How do I have the client "predict" that the player will thrust forward and also have the server also increase the PhysicsVelocity.Linear? (if that is appropriate).

Currently I have added a VelocityComponent to the player entity and created a MovementSystem that changes the position of the entity based on VelocityComponent.Linear * deltaTime. I assume this is not the way to do it because it "teleports" the entity by changing the position so it "merges" with asteroids instead of bouncing off of them.

Have I missed something involving Kinematics?

Note, this is what I mean by wanting to update physics velocity on user input:

Code (CSharp):

1.         Entities
2.         .WithReadOnly(inputFromEntity)
3.         .WithAll<PlayerTag, PlayerCommand, Child>()
4.         .ForEach((Entity entity, int nativeThreadIndex, ref Rotation rotation, ref PlayerStateComponent state, ref VelocityComponent velocityComponent,
5.                 in GhostOwnerComponent ghostOwner, in PredictedGhostComponent prediction) =>
6.         {
7.  
8.             if (!GhostPredictionSystemGroup.ShouldPredict(currentTick, prediction))
9.                 return;
10.             var input = inputFromEntity[entity];
11.  
12.             PlayerCommand inputData;
13.             if (!input.GetDataAtTick(currentTick, out inputData))
14.                 inputData.shoot = 0;
15.  
16.             state.State = inputData.thrust;
17.  
18.             if (inputData.right == 1)
19.             {   //thrust to the right of where the player is facing
20.                 velocityComponent.Linear += math.mul(rotation.Value, new float3(1,0,0)).xyz * playerForce * deltaTime;
21.                 // PhysicsComponentExtensions.ApplyLinearImpulse(ref physicsVelocity, physicsMass, (math.mul(rotation.Value, new float3(1,0,0)).xyz));
22.                
23.             }
24.             if (inputData.left == 1)
25.             {   //thrust to the left of where the player is facing
26.                 velocityComponent.Linear += math.mul(rotation.Value, new float3(-1,0,0)).xyz * playerForce * deltaTime;
27.                 // PhysicsComponentExtensions.ApplyLinearImpulse(ref physicsVelocity, physicsMass, (math.mul(rotation.Value, new float3(-1,0,0)).xyz));
28.             }
29.             if (inputData.thrust == 1)
30.             {   //thrust forward of where the player is facing
31.                 velocityComponent.Linear += math.mul(rotation.Value, new float3(0,0,1)).xyz * playerForce * deltaTime;
32.                 // PhysicsComponentExtensions.ApplyLinearImpulse(ref physicsVelocity, physicsMass, (math.mul(rotation.Value, new float3(0,0,1)).xyz));
33.             }
34.             if (inputData.reverseThrust == 1)
35.             {   //thrust backwards of where the player is facing
36.                 velocityComponent.Linear += math.mul(rotation.Value, new float3(0,0,-1)).xyz * playerForce * deltaTime;
37.                 // PhysicsComponentExtensions.ApplyLinearImpulse(ref physicsVelocity, physicsMass, (math.mul(rotation.Value, new float3(0,0,-1)).xyz));
38.             }

 

Hi @timjohansson, current I found that Entities.WithChangeFilter<SomeComponent>() will not work as expected i.e. only run once when SomeComponent data changes when SomeComponent data marked as GhostField. Is there any plan to improve it? Is there any good solution to workaround it that make it only update once when SomeComponent data changes with its data marked as GhostField?

 

Hi @timjohansson, any plan to make GhostComponent attribute working on child entity too? For example u add [GhostComponent(PrefabType = GhostPrefabType.Server)] attribute to ComponentA that is belongs to child entity, ComponentA will only exists at server.

 

@timjohansson sorry to double ping, but is there any "approved" (recommended?) way to get immediate feedback on the predicted-client when you would like to update the PhysicsVelocity?

 

Thank you!

 

What processes take place if I put a "NetworkStreamRequestDisconnect" on the Network Connection Entity (NCE) on the client side?

I am guessing this deletes the NCE on the server side?
Or does it just add NetworkStreamDisconnected on the NCE on the server side?

Edit: It adds NetworkStreamDisconnected on the other side THEN deletes it.

 

Hi @steveeHavok. Can you provide a kinematic character controller based on raycasts for prediction sample into dots physics repo? I need it for this netcode.

 

The physics samples already contain a character controller https://github.com/Unity-Technologi...Assets/Demos/6. Use Cases/CharacterController

 

What I want is raycast based character controller. This sample is normal character controller.

 

The controller I linked does use collider casts and can be used just fine in prediction.
What is a normal character controller?

 

Hi @timjohansson.
1) Currently I need a feature that able to choose which subscene to be included into client, another subscene into server and yet another subscene into both client and server. I just need to choose the option at Subscene monobehavior to do that. Another feature I needed is there is subscene I want to make available at both client and server but I strip out something at Server. For current use case I want to strip RenderMesh also means strip out art asset from real build but still preserve physics collider. It's very similar feature like untick RenderMesh at GhostComponent monobehavior. But still when enter playmode at Editor I still able to load all the subscenes regardless of whether it belongs to client and/or server with client and server worlds to do testing easily. Then when I roll out the real build the build pipeline will dynamically figure out the only assets like art assets need to be included into the build.

2) Does this feature coming soon? Actually what I think this feature needs to combine with loading art assets on demand meaning that it will only start loading its 3D Model, texture, material etc when spawning ghost if it has art assets. The prefab inside GhostCollection is just lightweight version without art asset loaded yet. I believe this problem will need Dots Addressables to solve it.

 

Does adding a "NetworkStreamRequestDisconnect" work both ways?

If I put one on the server would all clients receive it?

Also, if the server times out from the clients, do clients receive a "NetworkStreamDisconnected" component on their NCEs?

EDIT: IT DOES

 

Thanks for NetCode 0.6!

I'm trying rewriting some systems to ISystemBase but I don't know how to solve for getting ticks to the job.
ISystemBase doesn't seem to have a reference to its World, so I can't get the GhostPredictionSystemGroup.
What am I missing or is this not supported?

 

NetCode 0.6 sadly doesn't support ISystemBase. The systems won't be created and as you mentioned the tick information is not accessible from unmanaged systems.

 

NetCode 0.6, rocks thank you NetCode team!

@timjohansson Questions from Change log:

"Added support for extrapolation when the tick being applied to interpolated ghosts on the client has not been received yet and is outside the interpolation delay. Set the new Smoothing field in the GhostField attribute to SmoothingAction.InterpolateAndExtrapolate to enable extrapolation."

How can this be done for a Physics Shape/Body?

If a client is receiving interpolated snapshots of a Physics Shape/Body, how do we set SmoothingAction.interpolateAndExtrapolate?

 

Nice that it is by default, thank you!

 

@timjohansson apologies for such a rudimentary question so late in the game but I realized there is a huge gap in my knowledge of how to create ghosted entities because all of my ghosted entities so far have been a prefab with a GhostAuthoringComponent.

If I am running in ServerSimulationSystemGroup and I want to create a ghosted entity for some reason:

var highScore = EntityManager.CreateEntity();
EntityManager.AddComponent<HighestScoreComponent>(highScore);

Where HighestScoreComponent

Code (CSharp):

1. using Unity.Networking.Transport;
2. using Unity.NetCode;
3. using Unity.Burst;
4. using Unity.Entities;
5. using Unity.Collections;
6.  
7. [GhostComponent]
8. public struct HighestScoreComponent : IComponentData
9. {
10.     [GhostField]
11.     public FixedString64 playerName;
12.  
13.     [GhostField]
14.     public int highestScore;
15. }

Is not working. Is adding a GhostComponent decorator to a IComponentData not enough to make the parent entity ghosted?

I am trying to figure out how to follow what happens with "GhostAuthoringComponent" in the package code but I am getting a bit lost.

It seems like in order to make a Ghost it should be a Prefab with a GhostAuthoringComponent otherwise the conversion won't take place?

 

Much appreciated! Makes sense, it isn't a big deal at all to always use a prefab to make ghosts so I get the non-priority.

 

1)

@timjohansson Does this solution able to strip the related art assets (Models, Textures, materials, shaders, animations etc) when rolling out server build so I can get very small build size?

2) Currently even the latest Netcode 0.6, the performance is very slow at Editor even Editor Release Mode is selected. When enter play mode I get super flow fps if u use laptop that has very weak CPU compares to desktop PC. From task manager, I see the CPU utilization is quite low. Maybe the bottleneck is main thread and Editor not able to fully utilize multithreading. Is there any plan to improve that? I think if I do even complex simulation I will get single digit fps.

Spoiler