unity job system unit movement stutter

I am currently moving all my units in an rts style game with the job system. profiler shows 1000fps (profiler doesnt show job performance yet). The problem is the units are stuttering in their movement randomly, this happens with just 1 unit instantiated. The projectiles(slower projectiles such as rockets) also show this stutter. Is there a setting i need to set or am i missing something?

unity version 2019.1.5f1 with latest preview packages, leak detection off
development build
burst is enabled
example code: position.Value = position.Value+(-localToWorld,forward) * deltaTime*7;
i have tried many variants of lerp same result. issue seems to be the job system

it seems to run smoother in the editor than the actual build..

on another note the profiler shows 0.5kb of garbage collection for 'DirtyTransformAccessArrayUpdate' but shows not spike in cpu(steady 1000fps) is this cause for alarm?

 

Show full code of your move system

 

full code for movement, i have moved back to MoveTowards with same stutter

Code (CSharp):

1. using Unity.Burst;
2. using Unity.Jobs;
3. using UnityEngine;
4. using UnityEngine.Jobs;
5. using Unity.Mathematics;
6. using Unity.Transforms;
7. using Unity.Physics;
8. using Unity.Entities;
9. using Unity.Collections;
10.  
11.  
12. public class unitMovementJob : JobComponentSystem
13. {
14.  
15.  
16.     [BurstCompile]
17.     public struct RotationSpeedJob : IJobForEachWithEntity<Translation, Rotation, unitTag, parentData>
18.     {
19.         // public float speed;
20.         public float topBound;
21.         public float bottomBound;
22.         public float deltaTime;
23.  
24.         public float time;
25.  
26.         [ReadOnly] public ComponentDataFromEntity<LocalToWorld> local;
27.  
28.  
29.         public void Execute(Entity entity, int index, ref Translation position, ref Rotation rotation, ref unitTag unit, ref parentData pData)
30.         {
31.  
32.          
33.             if ( pData.set)
34.             {
35.  
36.                 position.Value = Vector3.MoveTowards(position.Value, pData.destination, pData.unitSpeed * deltaTime);
37.  
38.                 if (!(position.Value - pData.destination).Equals(float3.zero))
39.                 {
40.                     unit.rot = Quaternion.LookRotation(position.Value - pData.destination);
41.                     unit.rot.x = 0.0f;
42.                     unit.rot.z = 0.0f;
43.                
44.                     rotation.Value = Quaternion.Slerp(rotation.Value, unit.rot, deltaTime * 15f);
45.                 }
46.  
47.             }
48.        
49.             if (!pData.destination.Equals(float3.zero) && Vector3.Distance(position.Value, pData.destination) < 5f)
50.             {
51.  
52.                 pData.destination = Vector3.zero;
53.                 pData.set = false;
54.             }
55.          
56.  
57.             unit.position = position.Value;//value;
58.             unit.rot = rotation.Value;
59.             pData.position = position.Value;
60.  
61.         }
62.     }
63.  
64.  
65.     protected override JobHandle OnUpdate(JobHandle inputDependencies)
66.     {
67.  
68.         var job = new RotationSpeedJob()
69.         {
70.             local = GetComponentDataFromEntity<LocalToWorld>(),
71.             deltaTime = Time.deltaTime,
72.             time = Time.time,
73.         };
74.    
75.         return job.Schedule(this, inputDependencies);
76.  
77.    
78.  
79.     }
80. }

 

Oh god...use code snippet for forum

 

fixed do you see anything?

 

Replace quaternion and vector3 methods to another from Mathematics library, they are optimized for SIMD.

 

About stutter. It can happen, your units going through target position rotates and going back (cos delta with speed can be greater than distance to target). Try add check if distance to target less than your movement delta clamp your movement delta by current distance.

 

none of those helped. it seems that i am getting the dredded movement stutter as mentioned here: https://forum.unity.com/threads/tim...t-vsync-camerafollow-and-jitter.430339/page-4
surprised this hasnt been resolved in the latest stable.

 

Show your code. Link not related to current problem.

 

I used to have movement stutter with ECS + jobs + burst + CameraFollow. It was alleviated by turning on incremental garbage collection.

Now that was for the player build. For the Editor, I've always had stutter since Unity 5. Tried everything like everyone else, but just learned to ignore it. Incremental garbage collector is enabled for the Editor in 2019.2, but it doesn't seem to help that much. Game view and Scene view UI code just keep spiking randomly.

For your case, I think you should first see if it's really the Job system by turning off jobs and do things on the mainthread for comparison.

 

i have finally traced the jitter cause. This is copy transform to gameobject proxy script. I have a gameobject which contains a status canvas. The status holds the vehicle health status bar and is instantiated at runtime with the following mono's:
'copy transform to gameobject proxy' : 'game object entity' and 'convert to entity with convert and inject gameobject' when i remove the 'copy transform to gameobject proxy' script the major jitters are no more. linked entity for this status is moved by the job system. Any other way of displaying such a system without using this transform to game object proxy ?

note that jitters are there even when the gameobject is instantiated and not being moved by any job system..

An empty gameobject with the above components is instantiated, my canvas system is then instantiated and parented to the gameobject, else the conversion system throws an error

 

it seems any type of entity conversion of a gameobject with child will cause this issue.
to replicate, create camera with rotation 90 on the x axis, place a cube under it, attach this script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class NewBehaviourScript : MonoBehaviour
5. {
6.  
7.     private void Start()
8.     {
9.         Application.targetFrameRate = 60;
10.     }
11.  
12.     // Update is called once per frame
13.     void Update()
14.     {
15.         if (Input.GetKey(KeyCode.UpArrow))
16.         {
17.             transform.position += Vector3.forward * Time.deltaTime * 25f;
18.         }
19.         if (Input.GetKey(KeyCode.DownArrow))
20.         {
21.             transform.position -= Vector3.forward * Time.deltaTime * 25f;
22.         }
23.         if (Input.GetKey(KeyCode.RightArrow))
24.         {
25.             transform.position -= Vector3.left * Time.deltaTime * 25f;
26.         }
27.         if (Input.GetKey(KeyCode.LeftArrow))
28.         {
29.             transform.position -= Vector3.right * Time.deltaTime * 25f;
30.         }
31.     }
32. }
33.  

build and see how smooth it is. now add another cube to the scene with a child cube. attach conver to entity(destroy) and see how jerky the movement is. (even though this is mono update, its aparrant in ecs jobs and non jobs).

 

Now it's more clear. You're about camera rendering stuttering, cos from you previous posts it's absolutely unclear. Yep now we need some one from Unity

 

So it def seems like an internal bug.
When i remove the Hybrid Renderer package and instantiate the entity, the stutter completely disappears(the entity isnt rendered but is instantiated)

 

Yes it’s renderer problem seems order of updating renderer and transforms. @Joachim_Ante I also can reproduce it

 

Still an issue with the latest update

 

I have this with even 2018.2 Unity -_- so annoying.

 

I'm experiencing it now in 2020.3.30. A lot of fps 450 if not limited, simplest movement code possible:

Code (CSharp):

1.  Entities.ForEach((
2.                 ref Translation translation,
3.                 ref ActorMoveData movement) =>
4.             {
5.                 translation.Value += movement.Direction * movement.Speed * deltaTime;
6.             }).ScheduleParallel();

and it stutters, 2 days I fought the thing, and found this post, but with no answer