Hi, I'm a newbie and have just started exploring openScad. For some reason whenever I try to create a module function, it returns a 'No top level geometry to render' error. I've tried it multiple times and it always results in this error. I'm clueless now. An example code and a screenshot of the error are below. radius=16; sides=5; thickness=1.5; module polyshape(){ difference(){ //outside part offset(r=5,$fn=48) circle(r=radius, $fn=sides); //inside part which is being subtracted offset(r=5-thickness,$fn=48) circle(r=radius, $fn=sides);} } <http://forum.openscad.org/file/n15744/Screen_Shot_2016-01-17_at_10.png> Thanks in advance! -- View this message in context: http://forum.openscad.org/module-function-not-working-tp15744.html Sent from the OpenSCAD mailing list archive at Nabble.com.

This is pretty common for non-programmers. The deal is you have created the module but you never invoke it. you need to add the line: polyshape(); in the main part of the program..I typically place it at the top Darren > On Jan 17, 2016, at 7:56 PM, jjnat14 <jjnat86@outlook.com> wrote: > > Hi, I'm a newbie and have just started exploring openScad. For some reason > whenever I try to create a module function, it returns a 'No top level > geometry to render' error. I've tried it multiple times and it always > results in this error. I'm clueless now. An example code and a screenshot of > the error are below. > > radius=16; > sides=5; > thickness=1.5; > > module polyshape(){ > > difference(){ > //outside part > offset(r=5,$fn=48) > circle(r=radius, $fn=sides); > //inside part which is being subtracted > offset(r=5-thickness,$fn=48) > circle(r=radius, $fn=sides);} > } > > <http://forum.openscad.org/file/n15744/Screen_Shot_2016-01-17_at_10.png> > > Thanks in advance! > > > > -- > View this message in context: http://forum.openscad.org/module-function-not-working-tp15744.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

A module is like a function definition: it defines a named "function" which takes arguments, and returns geometry as a result. It doesn't "do" anything by itself. If you don't call the module, then no geometry is generated. Add the following code to the end of your script, which calls the module: polyshape(); On 17 January 2016 at 22:56, jjnat14 <jjnat86@outlook.com> wrote: > Hi, I'm a newbie and have just started exploring openScad. For some reason > whenever I try to create a module function, it returns a 'No top level > geometry to render' error. I've tried it multiple times and it always > results in this error. I'm clueless now. An example code and a screenshot > of > the error are below. > > radius=16; > sides=5; > thickness=1.5; > > module polyshape(){ > > difference(){ > //outside part > offset(r=5,$fn=48) > circle(r=radius, $fn=sides); > //inside part which is being subtracted > offset(r=5-thickness,$fn=48) > circle(r=radius, $fn=sides);} > } > > <http://forum.openscad.org/file/n15744/Screen_Shot_2016-01-17_at_10.png> > > Thanks in advance! > > > > -- > View this message in context: > http://forum.openscad.org/module-function-not-working-tp15744.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 > > >

Thank you -- View this message in context: http://forum.openscad.org/module-function-not-working-tp15744p15748.html Sent from the OpenSCAD mailing list archive at Nabble.com.