I have an X3D scene, and I want to display coordinate axis in there, like in this example: https://x3dgraphics.com/examples/X3dForWebAuthors/Chapter03Grouping/CoordinateAxesIndex.html
However, my scene is quite big, and I want the coordinate axes to always be visible in the bottom left with a fixed size even as the viewpoint is moved around the big model (in the linked example, the aces are simply at the origin and if I move the camera around, they get out of the field of view). I can think go two ways of doing that, and I could get neither to work: