How to get all component values attached to an entity?

Unity Engine
, ,
1

I need to get all components attached to an entity, so that i can copy them across to another entity in order to merge the entities

2 
public unsafe static void Merge(this EntityManager em, Entity source, Entity target, bool useSourceOnConflict = false)
{
    var typeArray = em.GetComponentTypes(source, Allocator.Temp);
    var addTypeList = new NativeList<ComponentType>(Allocator.Temp);
    var conflictTypeList = new NativeList<ComponentType>(Allocator.Temp);
    for (int i = 0, len = typeArray.Length; i < len; i++)
    {
        var ct = typeArray[i];
        bool conflict = em.HasComponent(target, ct);
        if (conflict) conflictTypeList.Add(ct);
        else addTypeList.Add(ct);
    }

    var addTypes = new ComponentTypes(addTypeList.ToArray());
    em.AddComponents(target, addTypes);

    for (int i = 0; i < addTypeList.Length; i++)
    {
        var typeIndex = addTypeList[i].TypeIndex;
        var pData = em.GetComponentDataRawRO(source, typeIndex);
        var type = TypeManager.GetType(typeIndex);
        var size = UnsafeUtility.SizeOf(type);
        em.SetComponentDataRaw(target, typeIndex, pData, size);
    }

    if (useSourceOnConflict)
    {
        for (int i = 0; i < conflictTypeList.Length; i++)
        {
            var typeIndex = conflictTypeList[i].TypeIndex;
            var pData = em.GetComponentDataRawRO(source, typeIndex);
            var type = TypeManager.GetType(typeIndex);
            var size = UnsafeUtility.SizeOf(type);
            em.SetComponentDataRaw(target, typeIndex, pData, size);
        }
    }
}
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3 
var componentTypes = EntityManager.GetChunk(Entity).Archetype.GetComponentTypes();

If you want to get this in a job, you can use IJobChunk

public void Execute(ArchetypeChunk chunk, int index, int entityOffset)
{
    var componentTypes = chunk.Archetype.GetComponentTypes();
3 Likes
4

GetComponetnDataRawRO is internal in latest entities version :frowning:

6345453--705126--Screenshot 2020-09-24 at 18.37.48.png

5

it was always internal, if you need to access it you can create an assembly definition reference for the entities package and expose the internals for you own assembly

6

but that’s just for the types, is there any way to get the data?

7

how do you do that?

8

https://discussions.unity.com/t/809172

1 Like