00:01 <peeps[win]> that is to say, i'd love to see the "slow" version of the code and prove it can be optimized

00:04 <peeps[win]> without python LUT generation

00:44 <teepee> uh, oh, qr code challenge :)

01:50 <InPhase> peeps[win]: The python qrcodegen module I usually use is 900 lines and about half of those are comments. And it doesn't seem to import numpy or really any heavy-lifting libraries. It's basically self-contained.

04:06 <gbruno> [github] MichaelAtOz edited issue #3165 (Comparisons across types and for function literals) https://github.com/openscad/openscad/issues/3165

07:21 <guso78> Yes with Python Integration, QR-Code models dont need more than 10 Lines of Code. Most of IT needed to Draw the squares.

07:26 <guso78> Teepee i think i could get rid of Output Statement If Python was able to detect Expressions which are Not Used, Not assigned

07:26 <guso78> Shortest Code would be 6 Chars only: cube()

11:01 <juri_> teepee: one of these days, i swear, people will start using languages without dangerous primitives in them by default. #langsec

14:01 <ndnihil> https://github.com/xypwn/scadqr

14:01 <ndnihil> that's kinda neat

14:02 <ndnihil> not sure how useful it is

14:02 <ndnihil> but it's neat

15:29 <Scopeuk> Part of me is moderately tempted to use it to print a guest WiFi credentials are code

15:30 <Scopeuk> Silly auto correct s/are/qr

15:36 <ndnihil> eh, I did that with a 2d printer

15:36 <ndnihil> the issue with qr codes in 3d is that shadows and parallax change things

15:37 <ndnihil> so you have to be dead on center to read it

15:37 <ndnihil> and you'd have to use contrasting filaments for the color contrast

15:38 <ndnihil> I guess you could try just painting the face?

16:16 <Scopeuk> I sort of considered dark high bright low then fill the gaps with tipex or white paint and sand back

16:44 <guso78> I printed IT in White . Carefully painting the surface in black worked perfectly for me.

16:46 <guso78> https://www.thingiverse.com/thing:6061998

16:46 <othx> guso78 linked to "QR Code Door hanger by gigl" on thingiverse => 1 IRC mentions

16:48 <guso78> But IT also works having everything White and use the light cavities as black. The of course the qr Code needs to BE inversed.

17:36 <Scopeuk> Hmm the "light cavities" triggered a though, I wonder if just fiddling with the geometry might work (back lighting aside), should be possible to set one up where "white" is a flat top surface and black is a slightly sunken surface setup to scatter the light and cause a much lower response

17:37 <Scopeuk> A bit like how an anechoic chamber works

17:42 <J23k33> I thought about this too - or as a light screen - but the QR code has unconnected voids so you can't print only the black or only the white.  But  print the whites .5 lower  put a drop white paint on and use a cardboard edge to squeegee  over ..  Let it sit a bit and wipe on a wet tissue (or with ipa) to clean residue .. or sanding

17:49 <Scopeuk> I also wonder how a smooth/glass's build plate for light and then bridge for recessed dark might work.

17:49 <Scopeuk> The though experiment is interesting but I know I'm very lazy

18:01 <J23k33> i have done this with pattern and text and filled with nail polish .. works well - here the cairo pattern https://www.printables.com/model/560416-roller-shutter-pill-dispenser

19:34 <joseph__> teepee: I have been working on eliminating errors from VertexArray::addAttributePointers. From my investigation it still uses CPU-side vertex arrays. And that code seems to get called when doing F6 shader rendering, so I believe it needs to actually be replaced with something modern instead of just turned off entirely by a macro.

19:49 <teepee> joseph__: ah, it's possible, there's still some ancient code in some places. replacing those code path would be a good step forward

20:27 <guso78> J23, qr Codes use one of 8 different patterns which get xored to the result , which ensures that there are Not too big voids or too big faces in local areas. You dont need to worry about too "lonesome" Locations.

20:30 <J23k33> guso78 if  you check https://en.wikipedia.org/wiki/QR_code#/media/File:QR_code_for_mobile_English_Wikipedia.svg as example -  you will not be able to print only the white or only the black parts - it will fall apart.  so you can't print a black code leaving white as holes - or a white code leaving black parts as hole

20:33 <guso78> Yes understood. This IS why i use a Base layer below in Addition and Paint the very top face black. Filament IS white