[strich]

There exists software to reproject texture normals back on to a high poly model. So this problem does have a solution for anyone interested.

[jsheard]

That's assuming your generator produces a normal map, the ones I've seen do not, the only texture channel they output is color. That being the one channel that a model trained on images is naturally equipped to produce.

[huytersd]

You can generate pretty reliable texture depth maps from just an image. It’s going to be trash if you’re trying to generate the depth for the entire 3D model but I presume it’s going to go a good job with just texture. Then you just use a displacement based on the depth map.

[pksebben]

I may be speaking out of ignorance here, but couldn't you use photogrammetry techniques to translate these to a higher resolution mesh?