I want to make a mechanic where you click on character and select him. The problem - i can't understand how to detect if the object is in "player" group.

public override void _Input(InputEvent @event)
	{
		if (@event is InputEventMouseButton eventMouseButton && eventMouseButton.Pressed && eventMouseButton.ButtonIndex == MouseButton.Left){
			var _Rayfrom = _camera.ProjectRayOrigin(eventMouseButton.Position);
			var _Rayto = _Rayfrom + _camera.ProjectRayNormal(eventMouseButton.Position)*ray_l;
			PhysicsDirectSpaceState3D space_state = GetWorld3D().DirectSpaceState;
			PhysicsRayQueryParameters3D rayParams = PhysicsRayQueryParameters3D.Create(_Rayfrom, _Rayto);
			var rayhit = space_state.IntersectRay(rayParams);
			GD.Print(rayhit.Keys);
			GD.Print(rayhit["collider"]); //just tests
			if ((!rayhit.IsEmpty()) && (((Node3D)rayhit.Collider).IsInGroup("players"))){
				GD.Print("lol");
			}
		}
	}

The error states that "Dictionary" doesn't have "Collider" in it.
sry for bad english.

    NeOleg 1 - stop using chatGPT, learn to code or don't use C#. this reeks of chatGPT code.
    2 - stop using events. Set Inputs in project settings.
    3 - you are not checking for dictionary size.

    if (result.Count > 0)
    GD.Print("Hit at point: ", result["position"]);

    The result is a dictionary. If the ray didn't hit anything, the dictionary will be empty. If it did hit something, it will contain collision information:

    go and read the docs.
    https://docs.godotengine.org/en/stable/tutorials/physics/ray-casting.html

    and using the physics server has to be done in physics process.

        NeOleg

        func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseButton:
	
		if event.is_action_pressed("action_mouse_left"):
			var space_state = get_world_3d().direct_space_state
			var cam = $Camera3D
			var mousepos = get_viewport().get_mouse_position()

			var origin = cam.project_ray_origin(mousepos)
			var end = origin + cam.project_ray_normal(mousepos) * RAY_LENGTH
			var query = PhysicsRayQueryParameters3D.create(origin, end)
			query.collide_with_areas = true
			query.exclude = [self]

			var intersect = space_state.intersect_ray(query)
			if intersect:
				print("interset click1: ", intersect)

        intersect object

        {
   position: Vector3 # point in world space for collision
   normal: Vector3 # normal in world space for collision
   collider: Object # Object collided or null (if unassociated)
   collider_id: ObjectID # Object it collided against
   rid: RID # RID it collided against
   shape: int # shape index of collider
   metadata: Variant() # metadata of collider
}

        works for me, all you need to do here is to check if the intersect.collider is in group somehting.. but i ratehr not use groups but classes. so to check i just use -

        if intersext.collider is Player:
    # Do this and other things, not because they are easy but because they are hard.

          NeOleg click on character and select him

          You don't need raycasting for that. Use area's mouse_entered, mouse_exited and input_event signals.

            Jesusemora well.. i did not use chatGPT and i'm learning to code in C# specificaly, but thanks.