Calling Debug.DrawLine inside system [help needed] [api update]

I am trying to update an ANCIENT system I coded a while back to use the newer API. It uses ComponentDataArray and OnUpdate to call Debug.DrawLine inside a system.

Code (CSharp):

1.  protected override void OnUpdate()
2. {
3.      
4.         ComponentDataArray<PositionOfThing> positions = things.GetComponentDataArray<PositionOfThing>();
5.         for (int i = 0; i < positions.Length; i++)
6.         {
7.            Vector3 pos = positions[i].Value;
8.            Debug.DrawLine(pos, pos + Vector3.up, Color.green);
9.         }
10.  
11. }
12.  

How would I call a method that needs to be used from the main thread with modern API?

Thanks!

 

Code (CSharp):

1.  class MySystem: SystemBase
2. {  
3.     protected override void OnUpdate()
4.     {  
5.         Entities
6.             .WithoutBurst()
7.             .ForEach((in PositionOfThing positionOfThing)
8.             {
9.                Vector3 pos = positionOfThing.Value;
10.                Debug.DrawLine(pos, pos + Vector3.up, Color.green);
11.             }).Run();
12.     }
13. }
14.  

Edit:
As @Srokaaa has pointed out in 2020.1, this can actually just be:

Code (CSharp):

1.  class MySystem: SystemBase
2. {
3.     protected override void OnUpdate()
4.     {  
5.         Entities
6.             .ForEach((in PositionOfThing positionOfThing)
7.             {
8.                Vector3 pos = positionOfThing.Value;
9.                Debug.DrawLine(pos, pos + Vector3.up, Color.green);
10.             }).Schedule();
11.     }
12. }
13.  

 

Btw. in Unity 2020.1 Release Notes they state that you can call Debug.DrawLine() from a job so you don't even need main thread for this.

https://unity3d.com/unity/alpha/2020.1.0a18

Graphics: Debug.DrawLine now callable from C# jobs

 

Ooo nice! Thank you so much for your help!

 

This is just what I was looking for! I'll try it out! Thank you.

 

That is a saver of lives for me. I was currently making a hacky implementation of this to visualise debug triangulations.