Create parent-child at runtime

I can create a parent and child entities at runtime using the below. Works great.

Code (CSharp):

1.     protected override void OnUpdate()
2.     {
3.         if (!runOnce)
4.         {
5.             var parentPrefab = GetSingleton<ParentPrefab>().Value;
6.             var parent = EntityManager.Instantiate(parentPrefab);
7.          
8.             var cubePrefab = GetSingleton<CubePrefab>().Value;
9.             var cube = EntityManager.Instantiate(cubePrefab);
10.          
11.             EntityManager.AddComponentData(cube, new Parent {Value = cube});
12.             EntityManager.AddComponentData(cube, new LocalToParent {Value = new float4x4(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1)});
13.             var children = EntityManager.AddBuffer<Child>(parent);
14.             children.Add(new Child {Value = cube});
15.  
16.             var q = quaternion.EulerXYZ(0, 45 * Mathf.Deg2Rad, 0);
17.             SetComponent(parent, new Rotation {Value = q});
18.          
19.             runOnce = true;
20.         }
21.     }

 

Works great until adding Rotation to parent.. then LocalToParentSystem throws a stackoverflow.

 

Don't Add the Child buffer. Let Unity handle that.

 

Thanks @DreamingImLatios
Also needed LocalToWorld for ParentSystem's query.

Here's a working version for posterity.

Code (CSharp):

1.     protected override void OnUpdate()
2.     {
3.         if (!runOnce)
4.         {
5.             var parentPrefab = GetSingleton<ParentPrefab>().Value;
6.             var parent = EntityManager.Instantiate(parentPrefab);
7.            
8.             var childPrefab = GetSingleton<ChildPrefab>().Value;
9.             var child = EntityManager.Instantiate(childPrefab);
10.            
11.             // Add Parent and friends for ParentSystem's updateNewParents
12.             EntityManager.AddComponentData(child, new Parent {Value = parent});
13.             EntityManager.AddComponentData(child, new LocalToParent {Value = new float4x4(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1)});
14.             EntityManager.AddComponentData(child, new LocalToWorld() {Value = new float4x4(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1)});
15.            
16.            
17.             // Set Rotation on parent
18.             var q = quaternion.EulerXYZ(0, 45 * Mathf.Deg2Rad, 0);
19.             SetComponent(parent, new Rotation {Value = q});
20.            
21.             runOnce = true;
22.         }
23.     }