Godel Escher Bach QR Code shadow cube
by SashimiTabernacleChoir, published
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.
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Any thoughts on rendering the negative and trying a dual-color print? The covered innards could obviously be deleted from the model and it would make for a simple print. Or the innards could remain and we could use dissolvable PVA as the second/support material. And maybe I missed it in the discussion, but there would have to be quite a few floating fragments if this object were to truly exist, right?
Yeah I have never been successful either. (Although once there was an interesting glitch with Skeinforge, which generated gcode essentially just creating a big cube of random plastic thread. Looked like an aerogel and squished like a sponge.)
I think this one may be in the category "cool in principle but not in practice". For one thing I'm no longer convinced all the mass in the interior is supported.
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