Muck!
I was trying out a bit of Substance Painter this week, in combination with 3DSMax and Marmoset Toolbag 3. A few months back I had shot a muddy embankment near a construction area with my phone, about 16 photos, but really didn’t think anything decent could be recovered through photogrammetry. The results show however that it’s always worth a go even if you don’t have the proper equipment with you. Some cloning work in painter and then an export into Toolbag 3 for rendering yielded a decent mud texture, next step is to make it tileable.
Pete Mc Nally's Blog 
Lovely work as always. I wrote an article about those Substance guys a while back, for CGSociety (probably still there somewhere!). Did you check the particle painter? I gather they are working on it running live in a game, but anyway, it is very clever in showing progress in a changing surface, drips, mud etc. Great software, among the many CGI softwares I am delighted not to be working with anymore!!
There is an ever expanding arsenal of incredible tools out there Rory, just wish they all lived under one roof!
Looks great!
Would you be willing to write a short tutorial on your workflow for achieving this effect for those who are experimenting with photogrammetry for the first time?
Thanks
Sure! I’m a bit busy right now but watch this space