Now, here's where it gets weird...
I did several test renders, trying to improve on the lighting. Then, without warning, the two FBX figures went totally black in Preview. Their renders were okay, but...
I tried reloading textures, I tried manually changing textures. No, Poser was not having it. Both FBX figures stayed black in preview. LF was okay in Preview, all were okay in local or 'Box' renders, using CPU or GPUs. After doing 'real life' stuff all afternoon, trying new notions as I went past, I thought to save scene as a PZ3, close Poser, load scene.
This worked. Sure, I had to point Poser at first texture for each figure. And I had to faff around with base-colours as described above...
Between braving the sleet to empty bins, change cat-litter and put last cards through neighbours' doors, I'd converted a nice 'Jeep' that showed up on DA's freebies.
https://www.deviantart.com/stefano9...-Prop-901436602
This was in 'SFM' format, for which I used free Noesis to extract textures and mesh. As Noesis does not pair-up textures to mesh parts, I was glad to find there were only three, a 'windscreen' and optional desert or jungle paint-jobs.
Took me a couple of minutes more with free Irfan View to adapt a copy of Jeep's desert texture as an ambiance mask for front and side-lights. My first test-render was far too bright, 'bleached'. Half a dozen test-renders later, I got to...
I've another, longer, 'Box' render running with LF dressed to sorta match the Jeep. The 'combats' set of vest+pants plus boots came from Rendo, but were not free, so I'll not link to them.