Question ECS - Setting localToWorld doesn't update child entities positions.

How are you supposed to move a parent entity and have the child entities 'follow'?

I've tried googling this but... I might be using the wrong terminology or something.

I'm working off the Boids example and this is what I'm currently doing.

Code (CSharp):

1.                
2. localToWorld.Value = float4x4.TRS(
3.     new float3(localToWorld.Position + (nextHeading * MoveDistance)),
4.     quaternion.LookRotationSafe(nextHeading, math.up()),
5.     new float3(1.0f, 1.0f, 1.0f));
6.  

 

localToWorld has changed it is now really only for physics interpolation / graphics.

See https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/transforms-concepts.html

 

Ah, so are we mostly working with the localTransform property now?

 

Yes

 

But how do you change the non-uniform scale if you shouldn't use localToWorld?

ah, like this: https://forum.unity.com/threads/how-to-scale-a-entity-in-a-non-uniform-way.1411515/
magical hidden by default component, got it.

(the docs are very unclear what it is, "you may use a PostTransformScale (float3x3). This will be applied in the following manner: LocalToWorld = WorldTransform.ToMatrix() * PostTransformScale", had to search around a lot for usage and context; it didn't even mention it's a component or part of a component)

 

There is nothing hidden or magical. It’s clearly described in the documentation of entities package. If someone didn’t read docs, well…