Hello together, I'm a beginner in OpenSad and I'm really confused about the result of this simple example: Code: Size=3; if (5>2) {Size=6; echo("Size=",Size);} echo("Size=",Size); Result: ECHO: "Size=", 6 ECHO: "Size=", 3 Why is the latest echo 3 and not 6? It seems to me that in 'if' condition variables cannot be set. Best regards and thank you in advane for your help! Sven ----- I'm using OpenScad Version 2019.05 -- Sent from: http://forum.openscad.org/

I suggest that you read https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/General#Scope_of_variables and after that bring your doubts here. I will be glad to answer them. Em seg., 25 de mai. de 2020 às 16:22, SNT <sven.sylla@freenet.de> escreveu: > Hello together, > > I'm a beginner in OpenSad and I'm really confused about the result of this > simple example: > > Code: > Size=3; > if (5>2) {Size=6; echo("Size=",Size);} > echo("Size=",Size); > > Result: > ECHO: "Size=", 6 > ECHO: "Size=", 3 > > Why is the latest echo 3 and not 6? It seems to me that in 'if' condition > variables cannot be set. > > Best regards and thank you in advane for your help! > > Sven > > > > > > ----- > I'm using OpenScad Version 2019.05 > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

No the Size you define inside braces is a different version and does not last outside the braces. Use something like this. Size = 5 > 2 ? 6 : 3; echo(Size); On Mon, 25 May 2020 at 16:22, SNT <sven.sylla@freenet.de> wrote: > Hello together, > > I'm a beginner in OpenSad and I'm really confused about the result of this > simple example: > > Code: > Size=3; > if (5>2) {Size=6; echo("Size=",Size);} > echo("Size=",Size); > > Result: > ECHO: "Size=", 6 > ECHO: "Size=", 3 > > Why is the latest echo 3 and not 6? It seems to me that in 'if' condition > variables cannot be set. > > Best regards and thank you in advane for your help! > > Sven > > > > > > ----- > I'm using OpenScad Version 2019.05 > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

Thank you pretty much Ronaldo! I didn’t read this topic so far. Now It‘s clear to me and I can proceed! Best regards Sve (SNT) Von: Discuss <discuss-bounces@lists.openscad.org> Im Auftrag von Ronaldo Persiano Gesendet: Montag, 25. Mai 2020 18:13 An: OpenSCAD general discussion <discuss@lists.openscad.org> Betreff: Re: [OpenSCAD] Beginner Confuse I suggest that you read https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/General#Scope_of_variables and after that bring your doubts here. I will be glad to answer them. Em seg., 25 de mai. de 2020 às 16:22, SNT <sven.sylla@freenet.de <mailto:sven.sylla@freenet.de> > escreveu: Hello together, I'm a beginner in OpenSad and I'm really confused about the result of this simple example: Code: Size=3; if (5>2) {Size=6; echo("Size=",Size);} echo("Size=",Size); Result: ECHO: "Size=", 6 ECHO: "Size=", 3 Why is the latest echo 3 and not 6? It seems to me that in 'if' condition variables cannot be set. Best regards and thank you in advane for your help! Sven ----- I'm using OpenScad Version 2019.05 -- Sent from: http://forum.openscad.org/ _______________________________________________ OpenSCAD mailing list Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

This is a behavior that seems to surprise a lot of people new to OpenSCAD. The language looks like a procedural language (something like C or Java), but it isn't. Once you realize that these aren't statements, that are executed one after another, the issue makes more sense. The best explanation I have found is the one from kevfquinn in this thread: https://www.thingiverse.com/groups/openscad/forums/general/topic:31166 Regards, Jan On Mon, May 25, 2020 at 12:30 PM nop head <nop.head@gmail.com> wrote: > No the Size you define inside braces is a different version and does not > last outside the braces. > > Use something like this. > > Size = 5 > 2 ? 6 : 3; > > echo(Size); > > > On Mon, 25 May 2020 at 16:22, SNT <sven.sylla@freenet.de> wrote: > >> Hello together, >> >> I'm a beginner in OpenSad and I'm really confused about the result of this >> simple example: >> >> Code: >> Size=3; >> if (5>2) {Size=6; echo("Size=",Size);} >> echo("Size=",Size); >> >> Result: >> ECHO: "Size=", 6 >> ECHO: "Size=", 3 >> >> Why is the latest echo 3 and not 6? It seems to me that in 'if' condition >> variables cannot be set. >> >> Best regards and thank you in advane for your help! >> >> Sven >> >> >> >> >> >> ----- >> I'm using OpenScad Version 2019.05 >> -- >> Sent from: http://forum.openscad.org/ >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > -- Jan Wieck Principal Database Engineer

Hello together, Actually I use the ? symbol from 'nop head's suggestion and i'm feeling pretty much comfortable to this very short code implemenation. I have been working since last year on OpenScad and for my application its the very best tool for my 3D objects. After some challenges with 'too long rendering time' ( obviously a typical beginner argument), mainly based on lots of extrude of dxf file commands, I easily fixed the time problem by closing the lines in the dxf file and the use of $fa instead of $fn. In the meanwhile I feel pretty much fine and for me its not a problem to wait one or two hours on the rendering. Thank you very much again for the support I got in this forum! Greetings from Sven (SNT) > Am 25.05.2020 um 21:56 schrieb Jan Wieck <jan@wi3ck.info>: > > This is a behavior that seems to surprise a lot of people new to OpenSCAD. The language looks like a procedural language (something like C or Java), but it isn't. Once you realize that these aren't statements, that are executed one after another, the issue makes more sense. > > The best explanation I have found is the one from kevfquinn in this thread: https://www.thingiverse.com/groups/openscad/forums/general/topic:31166 > > > Regards, Jan > > > >> On Mon, May 25, 2020 at 12:30 PM nop head <nop.head@gmail.com> wrote: >> No the Size you define inside braces is a different version and does not last outside the braces. >> >> Use something like this. >> >> Size = 5 > 2 ? 6 : 3; >> >> echo(Size); >> >> >>> On Mon, 25 May 2020 at 16:22, SNT <sven.sylla@freenet.de> wrote: >>> Hello together, >>> >>> I'm a beginner in OpenSad and I'm really confused about the result of this >>> simple example: >>> >>> Code: >>> Size=3; >>> if (5>2) {Size=6; echo("Size=",Size);} >>> echo("Size=",Size); >>> >>> Result: >>> ECHO: "Size=", 6 >>> ECHO: "Size=", 3 >>> >>> Why is the latest echo 3 and not 6? It seems to me that in 'if' condition >>> variables cannot be set. >>> >>> Best regards and thank you in advane for your help! >>> >>> Sven >>> >>> >>> >>> >>> >>> ----- >>> I'm using OpenScad Version 2019.05 >>> -- >>> Sent from: http://forum.openscad.org/ >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > -- > Jan Wieck > Principal Database Engineer > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org