I have been working on this point cloud for some time, with little positive outcome. Before I give up, I wondered whether someone more skilled, from the community, might have any advice?!
I have been asked to scan an internal wall of an old house (Some of the data can be found as an ASCII file here: http://bit.ly/2zFeKOc
). The task is to document old graffiti (in this case scratches/carvings in plaster rather than spray paint!), and I am really struggling to see anything clear in the data.
In the attached file, you will see a deeply etched set of initials (RL), on well dressed stone (presumably a Masons' Mark), in the bottom left. That is clearly visible in the cloud and any resultant mesh.
There are, however, a number of etchings to the right of this - easy ones to spot with the naked eye on site are the circle near the bottom of the scan (interpreted as a Witches Mark), and two shields with diamonds and chevrons towards the middle right. You can JUST make these out in the cloud (if you can get the shadows right), but they are almost non existent in any mesh at any detail. These carvings are more delicate and made in plaster. This surface is already rougher than the stone.
So is this just an issue of the surface being 'noisier' than the detail I am trying to pick out, or are there any hints to try things that might make the detail 'pop'?
It may also be that the technology I used is not up to the task. This is a finding in itself, as it informs the curator's methodology. However, before I blame the kit, I wanted to just check that I had exhausted all possibilities with the processing end.