Clone tool in the new SD 6 is sooooo weird. I'll have to use 20 nodes to make 20 stamps? And this angled light. How I supposed to do it outside, to capture walls, ground, whatever? There is no scanners on the market, there is even no tutorials about it... Overall I'm sceptic. Regular 'photogrammetry' workflow seems to be…
On top of the ones already mentioned, the new Substance Designer (6) has tools for tiling photo-scanned sources that look like they work really well. As for manual adjustment, @EliasWick brings up Photoshop, but I'd say something like 3DCoat or Substance Painter would work much better. They handle multiple channels…
There's no need for the offset anymore, there are other options now. You either paint in the 2D Editor, which can optionally display endless tiling (and allows you to paint across the edges), or you use a plane with 9 (or so) square tiles, all mapped to the same UV range. 3DCoat comes with one, but if Substance Painter…