Trouble is the jpg seems to be "zoomed in" many times too much.
bitmap ./Surface/Canaan_South_Topo_NZMG_990210_020240.jpg \ [0 0 2499000 6021000 100 100 2502000 6024000]
I have tried reducing the co-ords to the NE corner of the image, and seem to get a more legible, bur still erroneous, surface image.
-- answered by Wolfgang
A possibly related matter, I have had "sketches on" (no quote marks) in my layout since my first (almost) Therion steps last year, and not once have I had my jpg sketches exported to pdf. I expect they should, and I recall that the samples provided seem to do so - I could find no difference between my code and the samples.
Perhaps they are hidden below the surface bitmap. This needs to be fixed in some of the next releases.
Also the above code does not produce a 3D lox model. Is that because a surface is either 2D or 3D but not both?
It has to work in both modes (surface bitmap in 2D, surface bitmap + terrain in loch). You have to enter DTM (elevations) to display also the topographical map in 3D. Martin