How to Render a mesh to using RenderingServer?

I can use the RenderingSever API to render a torus mesh to the scene.

using Godot;
using static System.GC;
using static Godot.RenderingServer;

[Tool, GlobalClass]
public partial class RenderingTorus : Node3D
{   
    // Add torus mesh
    private readonly Mesh _torus = ResourceLoader.Load<Mesh>("res://assets/new_torus_mesh.tres");
    private Rid? _torusInstance;
    
    public override void _Ready()
    {
        // Add torus mesh
        _torusInstance = InstanceCreate();
        InstanceSetBase(_torusInstance.Value, _torus.GetRid());
        InstanceSetScenario(_torusInstance.Value, GetWorld3D().Scenario);
    }
    
    public new void Dispose()
    {
        base.Dispose();
        if (_torusInstance.HasValue)
        {
            FreeRid(_torusInstance.Value);
        }
        SuppressFinalize(this);
    }
}

But when I try to render a Torus mesh to an icon I get, only a blank black icon.

using Godot;

public static class Renderer
{

    public static Texture2D CreateIcon()
    {

        // 
        Rid scenario = RenderingServer.ScenarioCreate();

        // Create Camera
        Rid camera = RenderingServer.CameraCreate();
        
        // Add light to the scenario
        Rid light = RenderingServer.SpotLightCreate();
        Rid lightInstance = RenderingServer.InstanceCreate();
        RenderingServer.InstanceSetBase(lightInstance, light);
        RenderingServer.InstanceSetScenario(lightInstance, scenario);

        // Add torus mesh
        Mesh torus = ResourceLoader.Load<Mesh>("res://assets/new_torus_mesh.tres");
        Rid torusInstance = RenderingServer.InstanceCreate();
        RenderingServer.InstanceSetBase(torusInstance, torus.GetRid());
        RenderingServer.InstanceSetScenario(torusInstance, scenario);

        // Create The new viewport
        Rid viewport = RenderingServer.ViewportCreate();
        RenderingServer.ViewportSetSize(viewport, 64, 64);
        RenderingServer.ViewportSetUpdateMode(viewport, RenderingServer.ViewportUpdateMode.Always);
        RenderingServer.ViewportSetScenario(viewport, scenario);
        RenderingServer.ViewportAttachCamera(viewport, camera);
        
        RenderingServer.ForceDraw();
        RenderingServer.ForceSync();
        
        Rid lastRenderedFrameId = RenderingServer.ViewportGetTexture(viewport);
        Image lastRenderedFrame = RenderingServer.Texture2DGet(lastRenderedFrameId);
        Texture2D texture2D = ImageTexture.CreateFromImage(lastRenderedFrame);
        
        RenderingServer.FreeRid(viewport);
        RenderingServer.FreeRid(scenario);
        RenderingServer.FreeRid(camera);
        RenderingServer.FreeRid(lightInstance);
        RenderingServer.FreeRid(light);
        RenderingServer.FreeRid(torusInstance);

        return texture2D;

    }
}

Is there anything I can do to render a mesh to an image?