Mars DEM data to TG3

[JBT27]

I've had several hours of head scratching and banging over this.  I'm using the data available here:

http://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/meg128/

With these docs to help out:

https://isis.astrogeology.usgs.gov/IsisSupport/index.php/topic,341.0.html

I've got the data into Global Mapper, which gives the tiles as 90 degrees in long and 50 point something in lat, instead of the 44 degrees lat that the post says.  Global Mapper's 3D viewer shows the data looking OK.  I export a single tile to the TG format .ter, from Global Mapper.  But TG either shows a very spikey messed up something that looks nothing like the tile, or a very soft and truncated version of the tile, like it's been hacked off at a constant height, or nothing.

I'm stuck and could do with some help please.  Has anyone got this process working, can suggest what the workflow is to get this data from the USGS files into TG3, both as individual tiles and as a globe.  I thought there might be a ready to use DEM Mars globe, or data, but I'm not seeing it anywhere.

Thanks.

[Ariel DK]

I did not understand well what you want. but from what I understood, you see nothing at all when loading files in TG, right?.
You are loading in a default planet? if your answer is yes, thats your problem.
change the size of the default planet to 3.390 km (Mars radius)

[ajcgi]

Forget .ter
Export to GeoTIFF elevation format, 32-bit depth.
Import into a Geog heightfield load shader. It will still be correctly georeferenced.
Use an average of the corner values seen in the Geog heightfiel load as Lat Long at apex values on the mars planet if you want the data to appear at the North Pole of your planet. See attached jpeg for Mars planet.

This will give you correct scale and elevation.

[JBT27]

Thanks very much ajcgi - this seems to be working.  I'm not fully understanding the averaging to get the apex values, and actually the auto georeferencing is pulling in values off the geotiff that are showing a bounding box in TG but no terrain detail.  If I manually georeference, then I get a result.  I need to work with this some more and get a better understanding, but I'm definitely getting some results now, and much appreciate your help.

Thanks to Ariel too.