It would be very convenient to add a new Measurement source to represent a 3-D scaling object that could be embedded into the rendering. I was able to mock up something that almost works using the Fast Uniform Grid and 3D Text sources, but I think that lighting might be handled differently between the wireframe representation of the grid and the 3D text. I’m imagining a wireframe cube with the standard transformation controls, with one or more attached text labels.
I can already imagine some potential challenges, but I think it would make it much easier to provide appropriate spatial context, especially in cases where that’s not obvious. The exaggerated height of terrain in Antarctica might also benefit. @patchett2002