File:GEB QR preview featured.jpg
GEB_QR_preview_featured.jpg (690 × 518 pixels, file size: 74 KB, MIME type: image/jpeg)
Captions
Summary[edit]
DescriptionGEB QR preview featured.jpg |
English: The shadow of this cube in different directions gives QR codes pointing to the Wikipedia articles for Kurt Gödel, M.C. Escher, and J.S. Bach respectively. Also a pretty challenging print test. Note that QR codes cannot be read in mirror image, so only 3 of the 6 possible cube orientations cast a readable shadow.
Notes. This was generated using a reduced-url QR code generator, a paint program to connect disconnected sections, Inkscape to convert to dxf, and OpenScad to extrude, rotate, and intersect the 3 images. OpenScad rendering took almost 30 minutes on a fast computer. QR codes are fortunately very forgiving of fairly large modifications due to their built-in parity and redundancy schemes, and I verified readability of the images up through the dxf stage. (Although I got pretty close to the limit on one image, and my camera QR scanner had to rescan a few times to get a read.) This is a complex image. To get a readable shadow your light source will need to be pretty far away to get a flat pass through. Perhaps someday I'll do a version with transformed geometry, matching specific close-up point sources. If you can't get it to print cleanly enough to read, hey, claim it's a Borg Cube and gift it to your Trekkie friends. |
Date | |
Source | http://www.thingiverse.com/thing:15232 |
Author | SashimiTabernacleChoir |
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current | 21:28, 14 April 2013 | 690 × 518 (74 KB) | Pixeltoo (talk | contribs) | User created page with UploadWizard |
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