Back in the early 2000's I was a very active Terragen user. A couple of those renders can be seen
here.
I have tried Terragen 2 when it came out, and also
made three renders with version 4, but there is something special about 0.9.
The most powerful scenes I've seen are mostly made with 0.9.
Version 2 and up to me always had something 'undifined'. Maybe because of the noise, maybe the clouds, or several signatures of the rewritten render engine.
Or it could be a different user base, due the much higher learning curve. Making Terragen a more technical program, with less space for exploring creativity (I'll probably get slapped in the face for that one, since it might not even be true)... But then, when looking at long-time Terragen artists like Luc Bianco, I have to say in all honesty that I like his 0.9 renders (that are hard to find nowadays) more beautiful. The same counts for other long time Terragen artists.
This doesn't mean however that I haven't richly enjoyed every minute of BBC's The Planets, where I recognized Terragen in many beautiful scenes.
And an engine rewrite was probably the only course for Terragen to become what it is now.
But this unfortunately meant a complete hold on development of version 0.9, that never became 1... And thus never got multi threat support.
A week ago I was attempting to re-render some 0.9 images at 8k resolution at highest quality settings, but even with my i7 6900k 8-core 16 thread CPU this takes more that a day for certain images. This is of course because only 6,25% of the CPU's capacity is used (1 of 16 threats).
I know I could open 16 Terragen instances simultaneously and render 16 scenes at the same time.. And I actually did this with two, but the next morning one instance had vanished and the other I had to cancel because I was going away for a few days...
So my question really is, are there any old-time users here who know of a script or program that can split a render into several Terragen instances... To benefit from multi threat rendering and let the render finish 16 times faster...