[abenedik]

There is a WireBoxVisual3D. Is this what you are looking for? If you do not want to see the hidden lines, then add both a BoxVisual3D with the color of the background (use can use emissive color so that the box is not shaded) and then also add a WireBoxVisual3D - it should be just slightly bigger so that the lines do not lie exactly on the BoxVisual3D but just a little bit above it. See the "All Visual3D objects" and "Lines3D samples" to see what objects and lines are possible.