Hello, how to sketch and annotate three-dimensional images?Can I sketch a 3D image drawn by a volume? If so, how?

Are you looking for labelmap painting or some other sketches, such as a 1D curve in 3D?

Hello! The official website PaintWidget widget is sketched in two dimensions, is there a method or case that can be sketched in three dimensions?

The paint widget can sketch in 3D, but the example uses 2D. In fact, painting is done via vtkPaintFilter, which supports 2D and 3D brushes.