The Amiga had a rather interesting program called Vista Pro. All it did was take a seed value and some tweakable values and use that to render a semi-realistic

The Amiga had a rather interesting program called Vista Pro. All it did was take a seed value and some tweakable values and use that to render a semi-realistic looking landscape. It did indeed take quite a while to render a single frame, but you could batch them up and bring them together to make a fly-over animation. https://en.wikipedia.org/wiki/VistaPro https://en.wikipedia.org/wiki/VistaPro I spent ages playing with this piece of software. Trivial by todays standards perhaps, but a window into what was possible.