In Planet Map Generator, set Projection to Square and Colour Map to Greyscale. Generate the world and save it as an image. The default looks to be a BMP format, which means that it will import upside-down. If you can, use an external program to flip the saved image vertically.

In FT3:

a) set the world editing resolution to about that of your image using Map>>World Settings

b) Tools>>Global Set>>Land Roughness and a value of 0 (zero) to get a flat world

c) Select>>Load selection to load your image as a selection

d) Tools>>Global Set>>Land Offset Edit and a value of 60000 to make a terrain from 0 altitude to 60000 altitude

e) Select>>Deselect to remove the selection.

e) Tools>>Global Lower>>Land Offset and a value of 30000 to lower the terrain to -30000 to +30000.

I didn't flip the base image, so the FT3 world is upside down. ( the image is attached to the same thread on ProFantasy's forum at https://forum.profantasy.com/discuss...utput-into-ft3 )