Weird errors when loading a tilemap from another thread

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Weird errors when loading a tilemap from another thread

alex_sand

I am having a lot of weird C++ error messages when trying to load a tilemap from another thread, such as 'Condition "!id_map.has(p_rid.get_data())" is true.'
( Observed in Godot 3.5 and v3.5.1.stable.mono.official)

Two questions:

I am doing anything wrong in the code below?
the errors seem to come from the physic server. I want to use a tilemap for rendering only; can I dis-activate the physic elements of the tilemap? (Here I am wondering if the high cost of loading a tilemap could be related to loading collision stuff; maybe desactivating this would remove the need to load the tilemap in another thread? )

using Godot;
public class LoadTilemapInThread : Node2D
{
    TileMap _tilemap;

    public LoadTilemapInThread()
    {
        // Creating a tilemap and a minimal tileset
        _tilemap = new TileMap();
        _tilemap.TileSet = new TileSet();
        _tilemap.TileSet.CreateTile(1);
        _tilemap.TileSet.TileSetTexture(1, (Texture)GD.Load($"res://icon.png"));
        // So far, 1) tilemap is not in the tree  2) it contains no tiles
    }
    public override void _Ready()
    {
        // setting tiles in another thread
        StartLoadingThread();
    }

    void StartLoadingThread()
    {
        var thread = new System.Threading.Thread(new System.Threading.ThreadStart(Run));
        thread.Start();
    }

    void Run() // adding tile(s) to the tilemap. Running in another thread.
    {
        _tilemap.SetCell(0, 0, 1);
        this.CallDeferred(nameof(AddTilemapAsChild));
    }

    // finally adding the tilemap as a child of this.
    // Called with CallDeferred to avoid thread-safety issues.
    void AddTilemapAsChild() 
    {
        AddChild(_tilemap);
    }

    static Texture LoadTexture(string name)
        => (Texture)GD.Load($"res://images/{name}");

}

Here are the messages I get:

E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_mode: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:558 @ body_set_mode()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_attach_object_instance_id: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:680 @ body_attach_object_instance_id()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_collision_layer: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:708 @ body_set_collision_layer()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_collision_mask: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:721 @ body_set_collision_mask()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_param: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:734 @ body_set_param()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_param: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:734 @ body_set_param()
E 0:00:01.114   get: Condition "!id_map.has(p_rid.get_data())" is true. Returned: nullptr
  <C++ Source>  ./core/rid.h:142 @ get()
E 0:00:01.114   body_set_state: Condition "!body" is true.
  <C++ Source>  servers/physics_2d/physics_2d_server_sw.cpp:748 @ body_set_state()