VTK Avalonia Rendering Mode

Support
1

Hi, I am trying to use VTK in Avalonia for Windows application development (Avalonia version: 11.0.10, VTK version: 9.3). According to HelloVTKAvalonia provided in official Examples, I need to set RenderingMode to Wgl:

.With(new Win32PlatformOptions { RenderingMode = new[] { Win32RenderingMode.Wgl } })
.With(new X11PlatformOptions { RenderingMode = new[] { X11RenderingMode.Glx } });

using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Kitware.AvaloniaControls;
using Kitware.VTK;
using System;

namespace HelloVTKAvalonia
{
  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();
    }

    private void InitializeComponent()
    {
      AvaloniaXamlLoader.Load(this);

      RenderWindowControl ctrl = this.FindControl<RenderWindowControl>("VTKControl");
      if (ctrl != null)
      {
        ctrl.AttachedToVisualTree += InitVTKScene;
      }
    }

    public void InitVTKScene(object? sender, EventArgs args)
    {
      RenderWindowControl? mainView = sender as RenderWindowControl;

      vtkRenderWindow renderWindow = mainView.RenderWindow;

      vtkRenderer renderer = vtkRenderer.New();
      renderer.SetBackgroundAlpha(1.0);

      renderWindow.AddRenderer(renderer);

      vtkInteractorStyleTrackballCamera interactorStyle = vtkInteractorStyleTrackballCamera.New();
      renderWindow.GetInteractor().SetInteractorStyle(interactorStyle);

      vtkSphereSource src = vtkSphereSource.New();
      vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
      mapper.SetInputConnection(src.GetOutputPort());
      vtkActor actor = vtkActor.New();
      actor.SetMapper(mapper);
      renderer.AddActor(actor);
    }
  }
}

However, Wgl mode does not support transparency, making it impossible to present good-looking themes in Avalonia, such as Fluent Theme. But if I don’t add this setting, VTK won’t be able to render.
If not use Wgl, is there a better choice here? :worried: