Oops... sorry, I forgot to mention that the Delphi application itself will export to a disk file all the X,Y,Z and texturing data for the resulting landscape.

This data will then be imported into another program running in a DirectX environment and used to rebuild the same 3D landscape.

If the methods used to create a landscape in DirectX and OpenGL are radically different then it may be necessary to stick to DirectX - even if OpenGL is the better option.

Bazzer