#openscad on 2022-12-10 — irc logs at libera.irclog.whitequark.org

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01:58 <linext> is there a guide for using inkscape/openscad to make a good lithophane from a photo/painting?

01:59 <linext> i believe it needs to use grayscale and a small number of different shades of gray

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02:17 <linext> does openscad have something like textmetrics() for images?

02:17 <linext> so i could get the width and height in pixels?

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02:25 <linext> i guess this works: https://scruss.com/blog/2019/10/27/crude-lithophane-with-openscad/

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04:09 <gbruno> [github] fleiner opened pull request #4445 (Allow touch-pad friendly 3D navigation) https://github.com/openscad/openscad/pull/4445

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04:14 <RyotaroOda> teepee: super thanks!

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10:40 <gbruno> [github] kwikius synchronize pull request #4367 (ModuleLiterals: making openSCAD modules first class.) https://github.com/openscad/openscad/pull/4367

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11:55 <pbsds> Is there a way to make open faces?, I.e. non water tight shapes?

12:13 <teepee> officially no

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13:07 <J227886> IceSL a lua based modeler and slicer https://icesl.loria.fr/ from a first look maybe some scad scripts could be converted

13:10 * teepee will continue to boycot that thing ;-)

13:15 <J227886> because french?

13:16 <teepee> no, because in my totally not lawyer view they violated openscad license at some point

13:17 <teepee> also I don't like how they put all that grant money into closed source software, but I'm still not sure if it's public money or some private stuff

13:17 <teepee> if it's public money, my view would be that the result has to be open source

13:18 <teepee> but it's not 100% clear from the info I found where the money is coming from

13:19 <J227886> openscad ? did they use that? .. i already wondered about their bit strange license

13:20 <teepee> they had a plugin converting openscad code

13:20 <teepee> based on hacked openscad source

13:20 <J227886> ah they already done that .. seemed they working on nonplanar printing which could be nice

13:21 <teepee> I don't think that's available anywhere still, but I've not spend much time searching

13:21 <teepee> IIRC they also mostly moved to a web based version or at least pushing that more

13:23 <J227886> also the polyfoam caught my eye .. but probably not to suited for fdm

13:25 <J227886> the slicer and webprinter seems to be browser but can't find something for the script part

13:26 <J227886> the webprinter could be nice to test gcode https://icesl.loria.fr/webprinter/

13:29 <teepee> probably, but I doubt I will ever accept that license

13:29 <teepee> it's not even clear how "private" or "personal" use is covered

13:34 <J227886> in the browser the license text states free use for non- commercial and private.. so well the webprinter is not that fancy as i thought

13:35 J227886 is now known as J22

13:39 <J22> did GSoC gave scad a new shader, or how does that work?

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13:51 <pa> so now something new.. first time a (piece of) model renders with preview but doesn't render with render..

13:56 <teepee> J22: it's not merged yet

13:56 <teepee> but it adds a menu entry for selecting shaders

13:57 <J22> so some x-mas present or is there any date i can look forward to?

13:58 <pa> wait i know what might be going on

13:58 <J22> pa i have that all the time cuz my preview settings differ from render

13:58 <pa> J22: ah.. well i don't, and before i only had the other way around

13:59 <pa> usually cgal chewed stuff the preview didnt

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14:14 <pa> probably some geometry mistake: CGAL ERROR: precondition violation! Expr: ! _is_valid (_succ2_P) || comp_f (node1_P->object, _succ2_P->object) != LARGER

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14:22 <pa> or even other errors.. :think

14:43 <tcurdt> is there a way to error out in a function?

14:44 <tcurdt> in the sense of 'panic("this should have not happened")'

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14:51 <J22> tcurdt assert ?

14:52 <J22> https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#assert

14:52 <tcurdt> if that possible to use in functions (no modules) - that would work totally work for me.

14:53 <tcurdt> just not sure how that syntax would look like

14:53 <J22> yes .. you also could probably build something with echo if you don't want it to stop

14:53 <tcurdt> return an assert?

14:53 <tcurdt> seems like that's ok

14:54 <J22> f(x)=assert(x>5,"x too small") 5*x;

14:55 <J22> in case you didn't scrolled down https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#Using_assertions_in_function

14:56 <tcurdt> ah ... indeed missed the last example

14:57 <tcurdt> assert(false, "error") works

14:58 <tcurdt> a bit ugly but ok

14:58 <J22> if you don't use a condition but only false it will never work

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15:06 <tcurdt> J22 it's for a fall through case .... hence the wondering for a "panic" equivallent

15:10 <J22> not sure how you use this ↦ function Tan(x)=assert(x!=90)tan(x); // this would stop in case of a value of wrong size

15:11 <J22> but as long it is working for you ..

15:12 <J22> i assume you put the assert itself in to a conditional fork

15:12 <tcurdt> function conv(name) = (name == "foo") ? 1 : assert(false, "not foo");

15:13 <tcurdt> just a simplified example

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15:42 <J22> tcurdt function conv(name)=assert(name!="foo")1;

15:43 <tcurdt> J22 yeah, it was a simplified example

15:43 <tcurdt> that wouldn't fly in the real case

15:44 <tcurdt> the real function has multiple cases

15:44 <tcurdt> more a switch/case style

15:44 <tcurdt> and the assert/panic on the default/non-match

15:44 <J22> the point is that assert checks for a condition - so there is no need to put it into one

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15:45 <tcurdt> I know ... but that would not really work well in switch/case scenario

15:45 <J22> so at the beginning you check for the range/values

15:46 <tcurdt> that's against DRY

15:46 <tcurdt> but don't worry - I am all good like it is now :)

15:47 <J22> Ü

15:47 <tcurdt> what does that mean? :)

15:49 <J22> how does it look like? -- maybe tilt your head Ü :)

15:49 <tcurdt> when I try to forget my german - it kind of also looks like a smiley :)

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15:49 <J22> see so easy

15:49 <J22> a language with emoticons

15:50 <tcurdt> never seen it used like that :)

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15:50 <J22> however if you made a conditional that stops from a certain input - you can save it and just use the assert

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15:51 <J22> no need to repeat anything

15:51 <tcurdt> that wouldn't work on a fall through

15:52 <J22> i am sure you can't give an example where this wouldn't work

15:54 <tcurdt> then I am sure you we misunderstand each other

15:55 <tcurdt> function conv(name)=assert(name=="a" || name=="b" || name=="c") (name == "a") ? 1 : (name == "b") ? 2 : (name == "c") ? 3 ... you get the idea

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15:59 <J22> isn't search simpler for this?

16:00 <tcurdt> I am not following

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16:02 <J22> you are right that with strings this need to define a lot - i am using assert only for numbers to stop if e.g od < id

16:02 <J22> but if you have a list of switch cases it is simpler to use an array to define them and use https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#search

16:05 <tcurdt> I still would have to catch the non-match case (being an empty array) ... doesn't really feel simpler TBH

16:05 <tcurdt> at least not in this case

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16:11 <J22> is_list()

16:13 <J22> or just use the customizer if you say you only have 3 valid inputs

16:16 <tcurdt> nah - not an option

16:17 <J22> i am always amazed what strange scenarios people come up with.

16:19 <tcurdt> how is it a strange scenario to map a name to a number? :)

16:19 <tcurdt> if this is used as part of an API the customizer just isn't right tool for the job

16:20 <linext> i made a pull request

16:20 <linext> first time i did for openscad

16:20 <gbruno> [github] hackwin opened pull request #4446 (Added linear_extrude(1) to render 3D shape instead of 2D shape) https://github.com/openscad/openscad/pull/4446

16:21 <linext> if someone was using command-line openscad and ran the example scad files, it would not generate a 3d model

16:27 <J22> if you want 3D just extrude the 2D tree

16:30 <J22> you just added more complexity

16:35 <J22> linext you know that 2D is exported as svg and a lot people use scad not just for 3d

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17:05 <teepee> linext: I'm not sure we want to force everything as 3D

17:06 <teepee> as J22 already mentioned 2D is very much valid as DXF / PDF or SVG output

17:08 <J22> maybe we could put "2D examples" and "3D" so people know what to expect

17:10 <J22> i imagine if someone tries the examples and wonders why export as stl is not possible - if echo is off command line wouldn't display teh ERROR: Current top level object is not a 3D object.

17:10 <J22> on the other hand some one using that and switching off the echo - would know what he is doing

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22:25 <gbruno> [github] maave0 opened issue #4447 (JSON file changes order - messes with git history) https://github.com/openscad/openscad/issues/4447

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23:27 <linext> hmm, i think openscad users expect to get an STL file unless it's stated otherwise in the comments

23:29 <teepee> I've certainly seen people using SVG export

23:30 <teepee> it might make sense to highlight the difference a bit more

23:30 <linext> i mean, circle() produces 1mm shape

23:30 <linext> height is automatically 1mmm

23:31 <teepee> no, it does not, it has a slightly strange preview which even has an issue open to fix it

23:31 <linext> ah

23:32 <linext> well, i had to go through all the examples and make sure they work with web assembly

23:32 <linext> the ones that didn't work immediately were 2d that needed to be 3d

23:32 <linext> only 2 didn't work at all out of about 50

23:32 <linext> 4 needed linear_extrude(1)

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23:41 <teepee> linext: did you try SVG export? that would be a great additional feature

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