3D Foot Scanning

The Poughkeepsie Library makes a 3DSystems Sense scanner (V1) available to patrons and, after a bit of to-and-fro, I managed to get a not-awful scan of Mary’s right leg:

Mary - R foot - complete
Mary – R foot – complete

This was accomplished under field conditions in a cramped room hosting a Spanish-language “introduction to computers” class. We propped her leg across the edge of a table with her sock as a cushion.

The depth image resolution seems to be 1 mm and the software attempts to stitch multiple views from different angles into a consistent 3D model. The scanner requires a steady hand and a steady model to successfully glue new data onto the existing model; what seem small misalignments derail the matching.

The software has several presets, of which “Head” produces the best results. I have no idea what the algorithm thinks of her foot; maybe it’s been trained on some truly ugly faces.

Exporting the solid model as either STL or PLY allows import into (Windows-only) Meshmixer, wherein I sawed off the pieces we won’t need:

Mary R foot trimmed
Mary R foot trimmed

If only I had a foot fetish …

The 3DSystems software requires a fairly specific Windows 8 (or 10, which is so not happening) + Intel hardware configuration, which recently arrived as a $250 off-lease Dell Latitude 7250 laptop. It works fine through VNC, so I can use it from the Comfy Desk.

However, using a 3D scanner in your own home isn’t actually private:

3DSystems Sense Scanner - EULA
3DSystems Sense Scanner – EULA

All your data are belong to them:

3D Systems may also automatically collect and report back to 3D Systems information about the Software and Licensee’s usage along with limited information about the Device, 3D Printer, and/or other third-party applications. If 3D Systems implements automated data collection practices then Licensee may opt out of providing such data if Licensee has a license that authorizes Commercial Use.

Oh, and then you must activate the software before using it. The library IT folks tell me I can install & activate the scanner on my system without derailing their setup. I have my doubts, but we’ll see how it goes.

I must get into photogrammetry, ideally from the sofware libre branch as described there. The openMVG repo seems promising.

  1. #1 by theretiredengineer on 2019-10-17 - 17:01

    Your link to my page has reminded me that I need to update the list of links on that page to my other photogrammetry posts which I have now done.

    One point which may be of interest is that although I still use openMVG for the sparse reconstruction I have now moved to openMVS for the dense reconstruction. I found that it generally gave cleaner results than MVE. However it can be a bit of a memory hog and the post on the Sea Shell photogrammetry discusses some ways to overcome this issue.

    I haven’t tried scanning any body parts yet but that could be an interesting project for the future :)

    • #2 by Ed on 2019-10-25 - 20:17

      It should Just Work™, right? [grin]

      The key part may be keeping a sufficiently neutral background to prevent going mad trying to align different views, much as with the scanner. More study and a more congenial location will definitely help!

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