Mutually_Assured_Destruction/buildings/building_block.cs

using Godot;
public enum TileTypes
{
    NONE,
    Grass,
    Sand,
    Water,
}

public partial class building_block : Node3D
{
    [Export]
    public RayCast3D _ray = null;

    [Export]
    private TileTypes _compatible_tile = TileTypes.NONE;

    public bool IsPlaceable
    {
        get
        {
            if (_ray == null || _compatible_tile == TileTypes.NONE)
                return false;

            GodotObject collider = _ray.GetCollider();
            GD.Print(collider);

            if (collider == null)
                return false;

            return false;
        }
    }
}