C# Job System example

I had a hard time finding some examples of the job system, but finally I am starting to understand it, Here is an example script I made. It is probably not the most efficient use of the job system but atleast it should get you started

Code (CSharp):

1.  
2. using System.Collections;
3. using Unity.Collections;
4. using UnityEngine;
5. using UnityEngine.Jobs;
6.  
7. namespace Scripts {
8.     public struct MoveToTargetJob : IJobParallelForTransform {
9.         public float DeltaTime;
10.         public NativeArray<Vector3> Targets;
11.         public float Speed;
12.  
13.         // Called once per element in the TransformAccessArray
14.         public void Execute(int index, TransformAccess transform) {
15.             transform.position = Vector3.Lerp(transform.position, Targets[index], DeltaTime / Speed);
16.         }
17.     }
18.  
19.     public class TransformJob : MonoBehaviour {
20.         public int Count = 1000;        // How many spheres you want to spawn
21.         public float Speed = 20;        // The speed which the spheres moves
22.         public int SpawnRange = 50;     // The range from -SpawnRange to SpawnRange
23.  
24.         private Transform[] _transforms;
25.         private Vector3[] _targets;
26.  
27.         public void Start() {
28.             // Create (count) amount of spheres
29.             _transforms = new Transform[Count];
30.             for (int i = 0; i < Count; i++) {
31.                 GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Sphere);
32.                 obj.transform.position = new Vector3(Random.Range(-SpawnRange, SpawnRange), Random.Range(-SpawnRange, SpawnRange), Random.Range(-SpawnRange, SpawnRange));
33.                 obj.GetComponent<MeshRenderer>().material.color = Color.red;
34.                 _transforms[i] = obj.transform;
35.             }
36.  
37.             // initialize the targets array
38.             _targets = new Vector3[_transforms.Length];
39.  
40.             StartCoroutine(GenerateTargets());
41.         }
42.  
43.         // Generate targets, I was not able to use Random.Range inside the job system, so generate the outside
44.         public IEnumerator GenerateTargets() {
45.             while (true) {
46.  
47.                 for (int i = 0; i < _targets.Length; i++) {
48.                     _targets[i] = new Vector3(Random.Range(-SpawnRange, SpawnRange), Random.Range(-SpawnRange, SpawnRange), Random.Range(-SpawnRange, SpawnRange));
49.                 }
50.  
51.                 yield return new WaitForSeconds(2);
52.             }
53.         }
54.  
55.         public void Update() {
56.             // Put the spawned transforms into a TransfromAccessArray
57.             TransformAccessArray transAccArr = new TransformAccessArray(_transforms);
58.            
59.             // Create a native array for _targets
60.             NativeArray<Vector3> nativeTargets = new NativeArray<Vector3>(_targets, Allocator.Temp);
61.  
62.  
63.             // Setup the job
64.             var job = new MoveToTargetJob();
65.             job.DeltaTime = Time.deltaTime;
66.             job.Targets = nativeTargets;
67.             job.Speed = Speed;
68.  
69.             // Schedule the job
70.             job.Schedule(transAccArr);
71.  
72.             // Dispose of the arrays
73.             transAccArr.Dispose();
74.             nativeTargets.Dispose();
75.         }
76.     }
77. }
78.  

 

You can find some job system samples here.

 

I will definitly look at those, thanks

 

You should add a job handle and then call complete on it. Otherwise, you get a lot of errors at runtime.

Code (CSharp):

1. var jobHandle = job.Schedule(transAccArr);
2.  
3. jobHandle.Complete();

 

Do you have to schedule jobs in Update? If so why?

 

You can schedule a job anywhere on the main thread (you cannot schedule a job within a job - it’s somewhere explained in the docs)

 

Here is a repo with some more job system/burst examples:
https://github.com/korzen/Unity3D-JobsSystemAndBurstSamples

 

If anyone is interesting about testing jobs. I have made something similar like @korzen303 with addition control.

https://github.com/ErikMoczi/Unity.TestRunner.Jobs

 

Take a look at my repo for a couple of elementary samples: https://github.com/starikcetin/Learning-Unity-ECS

 

starikcetin
yep, these once are indeed good too. I looked a them previously.

 

Hello. Is it possible to use job system for navmesh with finite state machine?

 

That's a very broad questions however NavMesh are supported via the experimental NavMeshQuery

https://docs.unity3d.com/ScriptReference/Experimental.AI.NavMeshQuery.html

Note you'll need to build your own NavMeshAgent

 

Did you make any project with it?