Unity MeshPreview embedded in UI Toolkit VisualElement using IMGUIContainer

actually it's two files ...

// MonoBehaviour

using UnityEngine;

public class MeshPreview : MonoBehaviour
{
	public Mesh mesh;
	[Range(1, 1000)] public int previewHeight = 100;
	public bool showSettings = true;
}


---------------------------------------------------

// Editor script

using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

[CustomEditor(typeof(MeshPreview))]
public class MeshPreviewEditor : Editor
{
	private UnityEditor.MeshPreview preview;

	private void OnDisable()
	{
		if (preview != null)
		{
			preview.Dispose();
			preview = null;
		}
	}

	public override void OnInspectorGUI()
	{
		DrawDefaultInspector();

		var mp = target as MeshPreview;

		if (preview == null)
			preview = new UnityEditor.MeshPreview(mp.mesh);
		if (preview.mesh != mp.mesh)
			preview.mesh = mp.mesh;

		var rect = GUILayoutUtility.GetRect(1, mp.previewHeight);
		preview.OnPreviewGUI(rect, "TextField");
		if (mp.showSettings)
			preview.OnPreviewSettings();
	}

	public override VisualElement CreateInspectorGUI()
	{
		var customInspector = new VisualElement();
		customInspector.Add(new IMGUIContainer(() => { OnInspectorGUI(); }));
		return customInspector;
	}
}