How to group or sort in a query?

[vkensou]

I want to batch process objects with the same material and grid. How should I do it?

public struct ECSMesh : IComponent
{
    public Mesh mesh;
}

public struct ECSMaterial : IComponent
{
    public Material material;
}

public class RenderSystem : QuerySystem<ECSMesh, ECSMaterial, Position>
{
    protected override void OnUpdate()
    {
// batch process same mesh and same material
    }
}

[friflo]

The ECS has currently not functionality for sorting.
You can use query.ToEntityList().ToArray() to get the entities of a query as an Entity[].
This array can than be sorted with Array.Sort<>().

See Example

[vkensou]

The ECS has currently not functionality for sorting. You can use query.ToEntityList().ToArray() to get the entities of a query as an Entity[]. This array can than be sorted with Array.Sort<>().

See Example

Thank you reply. Seems I must copy datas from ecs to outside world.

[friflo]

Seems I must copy datas from ecs to outside world.

Correct.

Also, an optimization could be storing Entity & Component in a single struct and use this in an array for sorting.
This would minimize the .GetComponent<MyComponent1>() calls.