Rewriting a system using chunks/queries instead of to-be-deprecated injected group structs

[julian-moschuering]

@bac9-flcl

I’m not sure how to get entities from a chunk, but I assumed that chunk.GetNativeArray (entityType) is the correct way to do that.

Correct

@bac9-flcl

I’m not sure how to get components from a chunk, but I assumed that chunk.GetNativeArray (componentType) is the correct way to do that.

Correct

@bac9-flcl

I’m not sure if I understand the concept of chunks correctly - am I understanding right that to work with individual entities and components, I have to use two loop levels, one for chunk collection, and one for content of a chunk?

Correct. ComponentDataArray and co basically do the same in the background.

@bac9-flcl

One of these assumptions here is wrong, or I’m making some other mistake in the code, because the system linked above fails to do anything (BlockRendererAddition components remain attached to entities forever with no apparent consequences). I’m not sure where the issue is, because there are no errors or warnings

Some issues I see:

• GetArchetypeChunkEntityType/GetArchetypeChunkComponentType has to be executed in OnUpdate as this call is responsible for dependency tracking.
• There currently is nothing like Injection for this, you actually have to execute your queries:

var chunks = EntityManager.CreateArchetypeChunkArray(query, Allocator.TempJob);

@bac9-flcl

is chunk/query use supposed to be so verbose, or am I doing something wrong

Currently it is but I think they are working on it.