Best way to get object position to a JobComponentSystem?

Hi,
I am writing an RTS and have decided to rewrite the visibility code as an ECS system to try out the new paradigm. I wrote a Vision component, the OnUpdate and Execute methods are getting called fine. However I can't figure out how to get access to the transform.

I found out about the existence of the Position component and added it to my job mask. In my unit factory I naively wrote this code:

Code (CSharp):

1.  
2.             unitBehaviour.Entity = _session.EntityManager.CreateEntity();
3.             _session.EntityManager
4.                 .AddComponentData(unitBehaviour.Entity, new Vision());
5.             _session.EntityManager
6.                 .AddComponentData(unitBehaviour.Entity, new Position());

Predictably the resulting Position component is always 0.

So that unitBehaviour.Entity member is a thing I slapped onto my Behaviour class to store my Vision components with. Then I noticed that gameObjects already come with their own entity and I don't really need to add my own. Perhaps that one has a Position?

Code (CSharp):

1.  
2.             var e = unitBehaviour.gameObject.GetComponent<GameObjectEntity>();
3.             _session.EntityManager.AddComponentData(e.Entity, new Vision());

This second attempt fails because e is null. So the GameObjectEntity is not getting automatically created and does not hold the synchronized Position component that I am looking for.

How do I get a Position that is in synch with the transform.position of the respective gameObject without rewriting my movement system in ECS? Should I just create my own Positions for each gameObject and manually synch them?

(Unity 2018.2)

 

First of all - in hybrid approach you must add GameObjectEntity manually. Second - for sync positions and transforms use one of:

• First init Transform from GO to Position - Copy Initial Transform From Game Object
• Transform from GO to Position - Copy Transform From Game Object
• From Position to Transform - Copy Transform To Game Object

(except position they also copy rotation)

 

Thanks!