This is a similar task to my previous question but the solution may be quite different. I am using 2m lidar data, issued in 1km square tiles. These produce a very nice .lox image (you need to turn lighting on to see it properly,[Tools-Scene-Surface-Lighting]) #surfacellangattock2015.th # llangattock lidar data SO 2015 surface cs OSGB:SO grid-units metres grid 20000 15000 2 2 500 500 296.0408 295.9423 295.8873 295.75 295.6905 295.4575 295.2851 295.1193 295.0154 295.0615 294.9248 294.8278 294.7503 294.4315 294.2848 294.3126 294.4237 294.2691 294.0023 293.7406 293.5974 293.4051 293.1954 292.9969 292.7691 292.5034 292.4049 292.3217 292.1671 292.0351 291.8168 291.7964 291.618 291.5049 291.4644 …………………………………………… endsurface Attached is a sample of the files. As you may see the data is invisible but it is there, if you drag a cursor over the data area. Each line has 500 altitude heights and there are 500 lines of data. A, is the line length of the data , (some 4000 char) a problem with showing the numbers? B, To cover larger areas, I can easily add another 500 line but to do the whole system area, I will need over 30 tiles, Thats quite a bit of data to put in one file. So I have made a master file to combine each of the km tiles I need :- #surfacellangattocklidar.th # llangattock lidar data input surfacellangattock1815.th input surfacellangattock1915.th input surfacellangattock2015.th This compiles fine but the lox file only shows the data from the last file read. But the size of the lox file is larger. 1 tile gives a 1.9kb lox file, 2 tiles makes a 3.9kb and 3 tiles gives 5.8kb. So as the data seems to be there, it there some function to get it to show? John