Render method doesn't work on Avalonia

Development
1

Hi, I am using VTK on Avalonia, but I can’t get the render method work after the RenderWindowControl is created.
I created several triangles and added texture to them.
And I have a button to change the texture.
But the display won’t change with the render method.
Only mouse interaction with a interactor can refresh the display.
The Avalonia sample is too simple.
How should I force render the VTK control to refresh the display?

            byte os = 0;

            for (var i = 0; i < _textureData.Length; i++)
            {
                if (i == 0) os = (byte)new Random().Next(0, 255);
                _textureData[i] = os;
            }

            _texture = vtkTexture.New();
            _imageImport = vtkImageImport.New();

            _imageImport.SetDataExtent(0, 255, 0, 255, 0, 0);
            _imageImport.SetWholeExtent(0, 255, 0, 255, 0, 0);
            _imageImport.SetDataScalarTypeToUnsignedChar();
            _imageImport.SetNumberOfScalarComponents(1);

            var pinnedArray = GCHandle.Alloc(_textureData, GCHandleType.Pinned);
            var pointer = pinnedArray.AddrOfPinnedObject();
            
            _imageImport.SetImportVoidPointer(pointer);
            _imageImport.SetDataSpacing(1, 1, 1);
            _imageImport.SetDataOrigin(0, 0, 0);
            _imageImport.Update();
            _texture.SetInputConnection(_imageImport.GetOutputPort());
            _texture.Update();
            pinnedArray.Free();

            _vtkActor.SetTexture(_texture);
2

Hi @yimadong,

Thank you very much for your interest in ActiViz, and thank you for the detailed question.

You can trigger a refresh by calling RequestNextFrameRendering on the control.
Alternatively, calling Render on the interactor will also force a refresh.

Hope this helps;
Thanks,
Lucas