I am attempting to use the [$slop=] argument in screw_hole(), but it doesn't seem to have any effect. Can someone else verify that I am using this correctly? include <BOSL2/std.scad> include <BOSL2/screws.scad> #screw_hole( spa, head="button", length=20 ); vs. #screw_hole( spa, head="button", length=20, $slop=0.5 );

It's a bug in the handling of $slop. I have a fix in my dev version. On Thu, Oct 13, 2022 at 1:48 PM Leonard Martin Struttmann < lenstruttmann@gmail.com> wrote: > I am attempting to use the [$slop=] argument in screw_hole(), but it > doesn't seem to have any effect. Can someone else verify that I am using > this correctly? > > include <BOSL2/std.scad> > include <BOSL2/screws.scad> > > #screw_hole( spa, head="button", length=20 ); > > vs. > > #screw_hole( spa, head="button", length=20, $slop=0.5 ); > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

Is $slop built into OpenSCAD? I can't find it on the cheatsheet page ( http://openscad.org/cheatsheet/). If not, then is having a variable name starting with $ allowed for users to define? I had always thought they were special variables, like $fn, $fs etc. Thanks Kevin On Thu, Oct 13, 2022 at 5:22 PM Adrian Mariano <avm4@cornell.edu> wrote: > It's a bug in the handling of $slop. I have a fix in my dev version. > > On Thu, Oct 13, 2022 at 1:48 PM Leonard Martin Struttmann < > lenstruttmann@gmail.com> wrote: > >> I am attempting to use the [$slop=] argument in screw_hole(), but it >> doesn't seem to have any effect. Can someone else verify that I am using >> this correctly? >> >> include <BOSL2/std.scad> >> include <BOSL2/screws.scad> >> >> #screw_hole( spa, head="button", length=20 ); >> >> vs. >> >> #screw_hole( spa, head="button", length=20, $slop=0.5 ); >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

No, $slop is not built-in to OpenSCAD. The $ does not mean the variable is an OpenSCAD built-in. It means that its value gets inherited by its children. On Thu, Oct 13, 2022 at 7:25 PM Kevin Toppenberg <kdtop3@gmail.com> wrote: > Is $slop built into OpenSCAD? I can't find it on the cheatsheet page ( > http://openscad.org/cheatsheet/). If not, then is having a variable name > starting with $ allowed for users to define? I had always thought they > were special variables, like $fn, $fs etc. > > Thanks > Kevin > > On Thu, Oct 13, 2022 at 5:22 PM Adrian Mariano <avm4@cornell.edu> wrote: > >> It's a bug in the handling of $slop. I have a fix in my dev version. >> >> On Thu, Oct 13, 2022 at 1:48 PM Leonard Martin Struttmann < >> lenstruttmann@gmail.com> wrote: >> >>> I am attempting to use the [$slop=] argument in screw_hole(), but it >>> doesn't seem to have any effect. Can someone else verify that I am using >>> this correctly? >>> >>> include <BOSL2/std.scad> >>> include <BOSL2/screws.scad> >>> >>> #screw_hole( spa, head="button", length=20 ); >>> >>> vs. >>> >>> #screw_hole( spa, head="button", length=20, $slop=0.5 ); >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

Special variables[edit <https://en.wikibooks.org/w/index.php?title=OpenSCAD_User_Manual/Other_Language_Features&veaction=edit&section=1> | edit source <https://en.wikibooks.org/w/index.php?title=OpenSCAD_User_Manual/Other_Language_Features&action=edit&section=1> ] Special variables provide an alternate means of passing arguments to modules and functions. All user, or OpenSCAD, defined variables starting with a '$' are special variables, similar to special variables in lisp. Modules and function see all outside variables in addition to those passed as arguments or defined internally. Currently valid special variable names can only be composed of $ followed by simple characters and underscores [a-zA-Z0-9_] and do not allow high-ascii or unicode characters. The value for a regular variable is assigned at compile time and is thus static for all calls. Special variables pass along their value from within the scope (see scope of variables) <https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#Scope_of_variables> from which the module or function is called. This means that special variables can potentially have a different value each time a module or function is called. regular = "regular global"; $special = "special global"; module show() echo(" in show ", regular," ", $special ); echo (" outside ", regular," ", $special ); // ECHO: " outside ", "regular global", " ", "special global" for ( regular = [0:1] ){ echo("in regular loop ", regular," ", $special ); show();} // ECHO: "in regular loop ", 0, " ", "special global" // ECHO: " in show ", "regular global", " ", "special global" // ECHO: "in regular loop ", 1, " ", "special global" // ECHO: " in show ", "regular global", " ", "special global" for ( $special = [5:6] ){ echo("in special loop ", regular," ", $special ); show();} // ECHO: "in special loop ", "regular global", " ", 5 // ECHO: " in show ", "regular global", " ", 5 // ECHO: "in special loop ", "regular global", " ", 6 // ECHO: " in show ", "regular global", " ", 6 show(); // ECHO: " in show ", "regular global", " ", "special global" This is useful when multiple arguments need to be passed thru several layers of module calls. On Thu, Oct 13, 2022 at 6:31 PM Adrian Mariano <avm4@cornell.edu> wrote: > No, $slop is not built-in to OpenSCAD. The $ does not mean the variable > is an OpenSCAD built-in. It means that its value gets inherited by its > children. > > > > On Thu, Oct 13, 2022 at 7:25 PM Kevin Toppenberg <kdtop3@gmail.com> wrote: > >> Is $slop built into OpenSCAD? I can't find it on the cheatsheet page ( >> http://openscad.org/cheatsheet/). If not, then is having a variable name >> starting with $ allowed for users to define? I had always thought they >> were special variables, like $fn, $fs etc. >> >> Thanks >> Kevin >> >> On Thu, Oct 13, 2022 at 5:22 PM Adrian Mariano <avm4@cornell.edu> wrote: >> >>> It's a bug in the handling of $slop. I have a fix in my dev version. >>> >>> On Thu, Oct 13, 2022 at 1:48 PM Leonard Martin Struttmann < >>> lenstruttmann@gmail.com> wrote: >>> >>>> I am attempting to use the [$slop=] argument in screw_hole(), but it >>>> doesn't seem to have any effect. Can someone else verify that I am using >>>> this correctly? >>>> >>>> include <BOSL2/std.scad> >>>> include <BOSL2/screws.scad> >>>> >>>> #screw_hole( spa, head="button", length=20 ); >>>> >>>> vs. >>>> >>>> #screw_hole( spa, head="button", length=20, $slop=0.5 ); >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >