Hi!
The wonderful caldera on Hecates Tholus summit on themis website suggested me to try a photoclinometry 3D reconstruction.

Click to view attachment Click to view attachment Click to view attachment

Thats very good, though I dont think the left side came out entirely correct the way it slopes up there, thank you for posting though.

I would like to try this, but I don't know of any such Mac based software. In Photoshop there is an 'emboss' filter which effectively turns a grayscale DEM into a shaded relief map. Can a similar filter be designed that would reverse the process, turning a suitable image showing topography with minimal cast shadows into a rough grayscale DEM? Hand painting such things is a lot of work!

Don