After many hours of arguing, explaining that openscad is not
 python, I finally got a script that I can use. I've attached it
 below. I don't think I have the strength to get the full
 functionality of 'offset' to work with point described polygons.

 In the middle of this, I got it to write a python script to get
 the points from an svg file into a list in openscad format. It got
 that, more or less, in the first  attempt. I'd written similar a
 few years ago, couldn't find it.

 On 02/02/2025 19:58, Raymond West via Discuss wrote:

 Hi Roel,

 I've been experimenting with ChatGPT and openscad (and python)
 for a while - the free version. It is much, much better with
 python. It is frustrating with openscad - it starts off with good
 intentions, then keeps repeating the same mistakes. I
 continuously have to remind it about variables being immutable,
 and that openscad works in degrees, for example. After a half day
 of arguing, I generally give up.  Not that I know any, but I
 think its behaviour is symptomatic of a petulant child (and
 ChatGPT agreed with that description).

 My current 'problem', one that you may wish to test, is -

 I can generate a shape by using, say, circle( d=50,$fn=f) to give
 a pentagon if f=5, square if f=4, etc.. I need the vertices for
 creating that type of polygon. Not too difficult. If I want
 rounded corners, then I can use offset (r=x). Try to get your
 ChatGPT to generate the vertices for a polygon from that, i.e. a
 polygon with rounded corners, say points 0.1 apart around the
 circumference of the curves. I would be interested to see how you
 and ChatGPT get on, if you want to try. It is easier if the
 origin is within the polygon. I do not expect it to use
 Bosl2/python/other libraries in its solution, just raw openscad
 script.

 Best wishes,

 Ray

 On 29/01/2025 17:46, Roel Vanhout via Discuss wrote:

 Ah I'm sorry, it seems custom GPT's are available only when you
 have a Plus (i.e., paid) account, I hadn't realized that when I
 wrote the email. I will look into whether I can expose mine to
 other users - although mine isn't really set up for public use,
 more tuned to my needs and habits. But if anyone is interested
 and/or wants to play around with it I'll see what I can do.

 Cheers
 o unsubscribe send an email to discuss-leave@lists.openscad.org

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Hi Sanjeev, I've no need for it to smooth the inside of a polygon, at the moment. For the few occasions I may need it, I can use the inbuilt openscad offset, save as svg, convert it with the python script, and use the generated polygon points. Alternatively, in some cases, I could resize the initial polygon. For example, say I have four points making a square, with side lengths of 50, and I want to round the corners inside that square, by a radius of 10, then using the ChatGPT script, I think it will give the desired results with a square with side lengths 30. Here's some code, works with squares, nothing else, afaik. You could create the generic solution for any polygon.😉 // --- Example Usage for squares only ---- side = 50; wt = 10;// Fillet (wall thickness) radius at each vertex os=side/2; pl1 = [[-os, -os], [os,-os], [os, os], [-os, os]]; // Base polygon arc_segments = 50; // Number of points to generate along each fillet arc pl2 = fillet_polygon_points(pl1, wt, arc_segments); // Draw the final rounded polygon. difference() {     polygon(pl2);     polygon(pl1); } scale= (side-wt-wt)/(side); echo(scale=scale,new_side=scale*side); pl3=pl1*scale; pl4=fillet_polygon_points(pl3, wt, arc_segments); #polygon(pl4); On 05/02/2025 01:54, Sanjeev Prabhakar wrote: > Thanks > Does it offset inside the polygon also? > > On Wed, 5 Feb 2025 at 02:29, Raymond West via Discuss > <discuss@lists.openscad.org> wrote: > > After many hours of arguing, explaining that openscad is not > python, I finally got a script that I can use. I've attached it > below. I don't think I have the strength to get the full > functionality of 'offset' to work with point described polygons. > > In the middle of this, I got it to write a python script to get > the points from an svg file into a list in openscad format. It got > that, more or less, in the first  attempt. I'd written similar a > few years ago, couldn't find it. > > On 02/02/2025 19:58, Raymond West via Discuss wrote: >> >> Hi Roel, >> >> I've been experimenting with ChatGPT and openscad (and python) >> for a while - the free version. It is much, much better with >> python. It is frustrating with openscad - it starts off with good >> intentions, then keeps repeating the same mistakes. I >> continuously have to remind it about variables being immutable, >> and that openscad works in degrees, for example. After a half day >> of arguing, I generally give up.  Not that I know any, but I >> think its behaviour is symptomatic of a petulant child (and >> ChatGPT agreed with that description). >> >> My current 'problem', one that you may wish to test, is - >> >> I can generate a shape by using, say, circle( d=50,$fn=f) to give >> a pentagon if f=5, square if f=4, etc.. I need the vertices for >> creating that type of polygon. Not too difficult. If I want >> rounded corners, then I can use offset (r=x). Try to get your >> ChatGPT to generate the vertices for a polygon from that, i.e. a >> polygon with rounded corners, say points 0.1 apart around the >> circumference of the curves. I would be interested to see how you >> and ChatGPT get on, if you want to try. It is easier if the >> origin is within the polygon. I do not expect it to use >> Bosl2/python/other libraries in its solution, just raw openscad >> script. >> >> Best wishes, >> >> Ray >> >> On 29/01/2025 17:46, Roel Vanhout via Discuss wrote: >>> Ah I'm sorry, it seems custom GPT's are available only when you >>> have a Plus (i.e., paid) account, I hadn't realized that when I >>> wrote the email. I will look into whether I can expose mine to >>> other users - although mine isn't really set up for public use, >>> more tuned to my needs and habits. But if anyone is interested >>> and/or wants to play around with it I'll see what I can do. >>> >>> Cheers >>> o unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email todiscuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

Hi Ray, As far as I know, offset is one of the toughest functions to write. But if you do it correctly, there are plenty of applications. e.g. a prism like below is application of outer and inner offset [image: Screenshot 2025-02-05 at 10.20.12 PM.png] On Wed, 5 Feb 2025 at 18:40, Raymond West via Discuss < discuss@lists.openscad.org> wrote: > Hi Sanjeev, > > I've no need for it to smooth the inside of a polygon, at the moment. For > the few occasions I may need it, I can use the inbuilt openscad offset, > save as svg, convert it with the python script, and use the generated > polygon points. Alternatively, in some cases, I could resize the initial > polygon. For example, say I have four points making a square, with side > lengths of 50, and I want to round the corners inside that square, by a > radius of 10, then using the ChatGPT script, I think it will give the > desired results with a square with side lengths 30. > > Here's some code, works with squares, nothing else, afaik. You could > create the generic solution for any polygon.😉 > > // --- Example Usage for squares only ---- > side = 50; > wt = 10;// Fillet (wall thickness) radius at each vertex > > os=side/2; > pl1 = [[-os, -os], [os,-os], [os, os], [-os, os]]; // Base polygon > > arc_segments = 50; // Number of points to generate along each fillet arc > > pl2 = fillet_polygon_points(pl1, wt, arc_segments); > > // Draw the final rounded polygon. > difference() { > polygon(pl2); > polygon(pl1); > } > > scale= (side-wt-wt)/(side); > echo(scale=scale,new_side=scale*side); > pl3=pl1*scale; > > pl4=fillet_polygon_points(pl3, wt, arc_segments); > #polygon(pl4); > On 05/02/2025 01:54, Sanjeev Prabhakar wrote: > > Thanks > Does it offset inside the polygon also? > > On Wed, 5 Feb 2025 at 02:29, Raymond West via Discuss < > discuss@lists.openscad.org> wrote: > >> After many hours of arguing, explaining that openscad is not python, I >> finally got a script that I can use. I've attached it below. I don't think >> I have the strength to get the full functionality of 'offset' to work with >> point described polygons. >> >> In the middle of this, I got it to write a python script to get the >> points from an svg file into a list in openscad format. It got that, more >> or less, in the first attempt. I'd written similar a few years ago, >> couldn't find it. >> On 02/02/2025 19:58, Raymond West via Discuss wrote: >> >> Hi Roel, >> >> I've been experimenting with ChatGPT and openscad (and python) for a >> while - the free version. It is much, much better with python. It is >> frustrating with openscad - it starts off with good intentions, then keeps >> repeating the same mistakes. I continuously have to remind it about >> variables being immutable, and that openscad works in degrees, for example. >> After a half day of arguing, I generally give up. Not that I know any, but >> I think its behaviour is symptomatic of a petulant child (and ChatGPT >> agreed with that description). >> >> My current 'problem', one that you may wish to test, is - >> >> I can generate a shape by using, say, circle( d=50,$fn=f) to give a >> pentagon if f=5, square if f=4, etc.. I need the vertices for creating that >> type of polygon. Not too difficult. If I want rounded corners, then I can >> use offset (r=x). Try to get your ChatGPT to generate the vertices for a >> polygon from that, i.e. a polygon with rounded corners, say points 0.1 >> apart around the circumference of the curves. I would be interested to see >> how you and ChatGPT get on, if you want to try. It is easier if the origin >> is within the polygon. I do not expect it to use Bosl2/python/other >> libraries in its solution, just raw openscad script. >> >> Best wishes, >> >> Ray >> On 29/01/2025 17:46, Roel Vanhout via Discuss wrote: >> >> Ah I'm sorry, it seems custom GPT's are available only when you have a >> Plus (i.e., paid) account, I hadn't realized that when I wrote the email. I >> will look into whether I can expose mine to other users - although mine >> isn't really set up for public use, more tuned to my needs and habits. But >> if anyone is interested and/or wants to play around with it I'll see what I >> can do. >> >> Cheers >> o 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 >