Here's a new scan of some gravel.
It started with 9 photos from custom built scanning box.
Post production on the photos were done in Lightroom.
Then the photos were processed in substance designer using a scanning graph and then the textures were rendered in Marmoset.
You can see more on how this was built on my blog.
https://www.artstation.com/daverig/blog/1L1Q/bringing-the-outside-in

Gravel ball build from a surface scan and substance designers scanning graph. You can see how it was made over on my blog https://www.artstation.com/daverig/blog/1L1Q/bringing-the-outside-in
Since the Marmo view doesn't support displacement maps I brought the height map into max and displaces and exported the mesh, when used that in Marmo to generate the viewer.