thief-mission-viewer/project/code/TMV/Model.cs

using Godot;
using KeepersCompound.TMV.UI;

namespace KeepersCompound.TMV;

public partial class Model : Node3D
{
    public override void _Ready()
    {
        var resourceSelector = GetNode<Control>("%ResourceSelector") as ResourceSelector;
        resourceSelector.ResourceSelected += BuildModel;
    }

    public void BuildModel(string campaignName, string modelPath)
    {
        foreach (var node in GetChildren())
        {
            node.QueueFree();
        }

        Context.Instance.SetCampaign(campaignName);
        var model = Context.Instance.ModelLoader.Load(modelPath);
        AddChild(model);
    }
}