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My player is baked entity in subscene while main camera is outside on scene. For some reason system cannot find transform of camera, GameObject was found though.

public partial class CameraFollow : SystemBase
{
    Transform PlayerCamera;
    protected override void OnCreate()
    {
        PlayerCamera = GameObject.FindWithTag("MainCamera").transform;
    }

 
    protected override void OnUpdate()
    {
        var PlayerPosition = SystemAPI.GetComponentRO<LocalTransform>(SystemAPI.GetSingletonEntity<PlayerTag>());
        PlayerCamera.position = 
            new Vector3(PlayerPosition.ValueRO.Position.x, PlayerPosition.ValueRO.Position.y, PlayerCamera.position.z);

    }
}
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  • 1
    \$\begingroup\$ You won't get a lot of value from making your camera follow script an ECS system. There's probably only one or a small handful of cameras following players in your scene. The ECS is going to give you the most benefit when you use it for things where you have dozens, hundreds, or thousands of instances. If you really want to do it with with ECS, you can take a look at this example which shows how to save transform data in a NativeArray, then copy that data into non-ECS game object transforms outside of the ECS job. \$\endgroup\$ Commented Aug 27 at 23:07
  • 1
    \$\begingroup\$ This blog post walks through accessing transforms in an ECS job using a TransformAccessArray - and I think it's a good illustration of how the complexity of ECS is not a good fit for work you need to do for only one object once per frame. \$\endgroup\$ Commented Aug 27 at 23:18
  • \$\begingroup\$ He may start learning ECS. The value of making a camera follow a script is huge - it is called Hybrid ECS. \$\endgroup\$ Commented Oct 14 at 21:49

1 Answer 1

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Thats how I set the camera position in my ECS game:

void OnUpdate()
{
   Entities.ForEach((ref PlayerComponent palyer, ref LocalTransform transform) =>
   {
       MySingletoneECS.instance.CameraTransform.localPosition = new Vector3(transform.Position.x, transform.Position.y, -10);
   }).Run();
}
//where MySingletoneECS attached to game object in scene and have ref on camera
public class MySingletoneECS : MonoBehaviour
{
    public static MySingletoneECS instance;
    public Transform CameraTransform;
}
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