code here: module bracket(has_pillar){ adjz=1; if(has_pillar){adjz=hoffset;} echo(has_pillar = has_pillar, adjz = adjz, hoffset = hoffset); translate([0,0,adjz]){ ..... when run, I got: Compiling design (CSG Tree generation)... ECHO: has_pillar = true, adjz = 1, hoffset = 4.9 ECHO: has_pillar = false, adjz = 1, hoffset = 4.9 Compiling design (CSG Products generation)... *sometimes* I can see in console: ignore invalid *adjz*, like this message. I use nightly version. -- View this message in context: http://forum.openscad.org/If-Statement-problem-tp20043.html Sent from the OpenSCAD mailing list archive at Nabble.com.

The new adjz that you define in braces after the if only has the scope of the braces. You can't use if to achieve the result you want. You need to use a conditional expression, like this: adjz = has_pillar ? hoffset : 1; On 12 January 2017 at 10:20, eexpss <eexpss@gmail.com> wrote: > code here: > > module bracket(has_pillar){ > adjz=1; > if(has_pillar){adjz=hoffset;} > echo(has_pillar = has_pillar, adjz = adjz, hoffset = hoffset); > translate([0,0,adjz]){ > ..... > > when run, I got: > > Compiling design (CSG Tree generation)... > ECHO: has_pillar = true, adjz = 1, hoffset = 4.9 > ECHO: has_pillar = false, adjz = 1, hoffset = 4.9 > Compiling design (CSG Products generation)... > > *sometimes* I can see in console: > ignore invalid *adjz*, like this message. > > I use nightly version. > > > > > -- > View this message in context: http://forum.openscad.org/If- > Statement-problem-tp20043.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

your code really works. I always thought that this grammar is the same as the C language. So it has different. -- View this message in context: http://forum.openscad.org/If-Statement-problem-tp20043p20045.html Sent from the OpenSCAD mailing list archive at Nabble.com.

The syntax is C like but the semantics are different because there are no variables in OpenSCAD, only named constants that can only have one value for the entire script. Note also that the conditional assignment works in C as well. -- View this message in context: http://forum.openscad.org/If-Statement-problem-tp20043p20047.html Sent from the OpenSCAD mailing list archive at Nabble.com.