Yes I know this type of solutions, and I have managed to implement this in projects, with vtkjs of course, but it is just totally different than what I was looking for.
I want to render the UIs inside the geometry of the rendered images/objects, I just don’t know where should I start with, I did not see any examples in vtkjs for text rendering, or simple graphics rendering, in the 3D spaces vtkjs creates. Or maybe I just did not find them.