Goodbye, GFORGE. Hello, Terragen

Oh, dear. GFORGE no longer works for me, not in Windows XP and not in a DOS cmd box within Windows XP. Rather than drag out my old Windows 98 laptop to try that, I downloaded a free copy of Terragen, which does a similar sort of thing.

Unfortunately, Terragen doesn't output in a form that POVray understands as a height field.

But after much googling, I discovered For Export Only (FEO) which is a set of plugins for Terragen, including one that creates a BMP file that POVray understands.

Ah, well. No-one said it was going to be easy.