Apart from these 2 simple strategies there are another few like constructing meshes from random intersection points. I can do it but it is hard to explain for me. You can read about them. - poisson surface reconstruction method - ball pivoting method - alpha shape surface construction - marching cubes method These are very useful if you have unordered points list. Normals can be calculated from the intersection points. But for these to successfully create meshes you need to have very high density of points. I can share examples here if you can make sense of it. On Sun, 24 Aug, 2025, 8:21 am Sanjeev Prabhakar, <sprabhakar2006@gmail.com> wrote: > Yes, you can do that for sure. > > Here is strategy 2 for filleting. > > > On Sun, 24 Aug 2025 at 08:04, pca006132 <john.lck40@gmail.com> wrote: > >> Yes you can select sublist, but doing this is annoying. Ideally we should >> provide APIs to select edges formed due to intersection, or around certain >> features, for example. >> >> On Sun, Aug 24, 2025, 10:05 Sanjeev Prabhakar <sprabhakar2006@gmail.com> >> wrote: >> >>> Your question is not completely clear to me. Are you saying some portion >>> of the intersection line to convert to fillet? >>> >>> That can be done by selecting those few points in the intersection line. >>> So openscad should have a way to select a portion of a list. >>> >>> On Sun, 24 Aug, 2025, 5:50 am pca006132, <john.lck40@gmail.com> wrote: >>> >>>> OK, the method you are talking about doesn't seem new, and is not that >>>> general. >>>> >>>> Another question is, if we want to support this, we will need a way to >>>> specify which edges the user wants (apart from being able to compute the >>>> points in openscad). >>>> On 8/23/25 22:14, Sanjeev Prabhakar wrote: >>>> >>>> There are mainly 2 simpler ways which works for creating fillets >>>> >>>> strategy 1 is explained in attached file. >>>> >>>> Let me know, in case you have any questions >>>> >>>> >>>> On Sat, 23 Aug 2025 at 10:52, Sanjeev Prabhakar < >>>> sprabhakar2006@gmail.com> wrote: >>>> >>>>> Both are possible >>>>> perfect radius fillets and visually appealing one >>>>> I am attaching 2 files with very simple example, due to file size >>>>> constraints >>>>> >>>>> Will explain the strategies later in evening once I have some time >>>>> >>>>>

Here are examples of other ways to create fillets from an unordered points list. codes for the same could be found in my library: https://github.com/sprabhakar2006/openSCAD/blob/main/openscad3.py On Sun, 24 Aug 2025 at 11:30, Sanjeev Prabhakar <sprabhakar2006@gmail.com> wrote: > Apart from these 2 simple strategies there are another few like > constructing meshes from random intersection points. > I can do it but it is hard to explain for me. > You can read about them. > - poisson surface reconstruction method > - ball pivoting method > - alpha shape surface construction > - marching cubes method > > These are very useful if you have unordered points list. Normals can be > calculated from the intersection points. > > But for these to successfully create meshes you need to have very high > density of points. > > I can share examples here if you can make sense of it. > > > > On Sun, 24 Aug, 2025, 8:21 am Sanjeev Prabhakar, <sprabhakar2006@gmail.com> > wrote: > >> Yes, you can do that for sure. >> >> Here is strategy 2 for filleting. >> >> >> On Sun, 24 Aug 2025 at 08:04, pca006132 <john.lck40@gmail.com> wrote: >> >>> Yes you can select sublist, but doing this is annoying. Ideally we >>> should provide APIs to select edges formed due to intersection, or around >>> certain features, for example. >>> >>> On Sun, Aug 24, 2025, 10:05 Sanjeev Prabhakar <sprabhakar2006@gmail.com> >>> wrote: >>> >>>> Your question is not completely clear to me. Are you saying some >>>> portion of the intersection line to convert to fillet? >>>> >>>> That can be done by selecting those few points in the intersection >>>> line. So openscad should have a way to select a portion of a list. >>>> >>>> On Sun, 24 Aug, 2025, 5:50 am pca006132, <john.lck40@gmail.com> wrote: >>>> >>>>> OK, the method you are talking about doesn't seem new, and is not that >>>>> general. >>>>> >>>>> Another question is, if we want to support this, we will need a way to >>>>> specify which edges the user wants (apart from being able to compute the >>>>> points in openscad). >>>>> On 8/23/25 22:14, Sanjeev Prabhakar wrote: >>>>> >>>>> There are mainly 2 simpler ways which works for creating fillets >>>>> >>>>> strategy 1 is explained in attached file. >>>>> >>>>> Let me know, in case you have any questions >>>>> >>>>> >>>>> On Sat, 23 Aug 2025 at 10:52, Sanjeev Prabhakar < >>>>> sprabhakar2006@gmail.com> wrote: >>>>> >>>>>> Both are possible >>>>>> perfect radius fillets and visually appealing one >>>>>> I am attaching 2 files with very simple example, due to file size >>>>>> constraints >>>>>> >>>>>> Will explain the strategies later in evening once I have some time >>>>>> >>>>>>

I have posted a video on how to create fillets between 2 complex parts Although I have used python to create this, I feel the same methodology can be easily adopted in plain openscad and is easy to use especially for the people who are creating some very complex libraries in openscad. https://youtu.be/sGRo91wyzJI On Sun, 24 Aug 2025 at 16:22, Sanjeev Prabhakar <sprabhakar2006@gmail.com> wrote: > Here are examples of other ways to create fillets from an unordered points > list. > codes for the same could be found in my library: > https://github.com/sprabhakar2006/openSCAD/blob/main/openscad3.py > > On Sun, 24 Aug 2025 at 11:30, Sanjeev Prabhakar <sprabhakar2006@gmail.com> > wrote: > >> Apart from these 2 simple strategies there are another few like >> constructing meshes from random intersection points. >> I can do it but it is hard to explain for me. >> You can read about them. >> - poisson surface reconstruction method >> - ball pivoting method >> - alpha shape surface construction >> - marching cubes method >> >> These are very useful if you have unordered points list. Normals can be >> calculated from the intersection points. >> >> But for these to successfully create meshes you need to have very high >> density of points. >> >> I can share examples here if you can make sense of it. >> >> >> >> On Sun, 24 Aug, 2025, 8:21 am Sanjeev Prabhakar, < >> sprabhakar2006@gmail.com> wrote: >> >>> Yes, you can do that for sure. >>> >>> Here is strategy 2 for filleting. >>> >>> >>> On Sun, 24 Aug 2025 at 08:04, pca006132 <john.lck40@gmail.com> wrote: >>> >>>> Yes you can select sublist, but doing this is annoying. Ideally we >>>> should provide APIs to select edges formed due to intersection, or around >>>> certain features, for example. >>>> >>>> On Sun, Aug 24, 2025, 10:05 Sanjeev Prabhakar <sprabhakar2006@gmail.com> >>>> wrote: >>>> >>>>> Your question is not completely clear to me. Are you saying some >>>>> portion of the intersection line to convert to fillet? >>>>> >>>>> That can be done by selecting those few points in the intersection >>>>> line. So openscad should have a way to select a portion of a list. >>>>> >>>>> On Sun, 24 Aug, 2025, 5:50 am pca006132, <john.lck40@gmail.com> wrote: >>>>> >>>>>> OK, the method you are talking about doesn't seem new, and is not >>>>>> that general. >>>>>> >>>>>> Another question is, if we want to support this, we will need a way >>>>>> to specify which edges the user wants (apart from being able to compute the >>>>>> points in openscad). >>>>>> On 8/23/25 22:14, Sanjeev Prabhakar wrote: >>>>>> >>>>>> There are mainly 2 simpler ways which works for creating fillets >>>>>> >>>>>> strategy 1 is explained in attached file. >>>>>> >>>>>> Let me know, in case you have any questions >>>>>> >>>>>> >>>>>> On Sat, 23 Aug 2025 at 10:52, Sanjeev Prabhakar < >>>>>> sprabhakar2006@gmail.com> wrote: >>>>>> >>>>>>> Both are possible >>>>>>> perfect radius fillets and visually appealing one >>>>>>> I am attaching 2 files with very simple example, due to file size >>>>>>> constraints >>>>>>> >>>>>>> Will explain the strategies later in evening once I have some time >>>>>>> >>>>>>>

Sanjeev: Since you know all about this algorithm, and it is "easily adopted in plain OpenSCAD", sounds like you should be the one to develop that feature in pure OpenSCAD. Jon On 9/3/2025 12:44 PM, Sanjeev Prabhakar via Discuss wrote: > I have posted a video on how to create fillets between 2 complex parts > > Although I have used python to create this, I feel the same > methodology can be easily adopted in plain openscad and is easy to use > especially for the people who are creating some very complex libraries > in openscad. > > https://youtu.be/sGRo91wyzJI > > -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Hi Jon, For sure I can do it, but it will take me time to write all the necessary functions and it will be a waste of time when so much work is done by many others especially bosl2 developers. But I can do a poc in pure openscad and post it here. Regards On Wed, 3 Sept, 2025, 10:53 pm Jon Bondy, <jon@jonbondy.com> wrote: > Sanjeev: > > Since you know all about this algorithm, and it is "easily adopted in > plain OpenSCAD", sounds like you should be the one to develop that > feature in pure OpenSCAD. > > Jon > > On 9/3/2025 12:44 PM, Sanjeev Prabhakar via Discuss wrote: > > I have posted a video on how to create fillets between 2 complex parts > > > > Although I have used python to create this, I feel the same > > methodology can be easily adopted in plain openscad and is easy to use > > especially for the people who are creating some very complex libraries > > in openscad. > > > > https://youtu.be/sGRo91wyzJI > > > > > > -- > This email has been checked for viruses by AVG antivirus software. > www.avg.com >

here is the scad example: you need to use my library "dependencies.scad" to show this On Thu, 4 Sept 2025 at 04:06, Sanjeev Prabhakar <sprabhakar2006@gmail.com> wrote: > Hi Jon, > For sure I can do it, but it will take me time to write all the necessary > functions and it will be a waste of time when so much work is done by many > others especially bosl2 developers. > > But I can do a poc in pure openscad and post it here. > Regards > > On Wed, 3 Sept, 2025, 10:53 pm Jon Bondy, <jon@jonbondy.com> wrote: > >> Sanjeev: >> >> Since you know all about this algorithm, and it is "easily adopted in >> plain OpenSCAD", sounds like you should be the one to develop that >> feature in pure OpenSCAD. >> >> Jon >> >> On 9/3/2025 12:44 PM, Sanjeev Prabhakar via Discuss wrote: >> > I have posted a video on how to create fillets between 2 complex parts >> > >> > Although I have used python to create this, I feel the same >> > methodology can be easily adopted in plain openscad and is easy to use >> > especially for the people who are creating some very complex libraries >> > in openscad. >> > >> > https://youtu.be/sGRo91wyzJI >> > >> > >> >> -- >> This email has been checked for viruses by AVG antivirus software. >> www.avg.com >> >