What i was trying to say, without using some sort of
blending/hull/whatever for a coarsely segmented sphere and cylinders,
you cannot get the edges to match. For manifold spheres, you can get a
match for 90 deg. I'm not sure if there is any other construction of a
sphere that allows, say, 45 deg angles as well, without other manipulation.
Hulling is OK, but it distorts the facets of the sphere, but depending
on the ultimate objective of using faceted cylinders, then that may not
matter.
On 05/07/2026 14:41, Adrian Mariano via Discuss wrote:
There is Doug Moen's "curv" program. https://curv3d.org/ I think he
got inspired to write it because he didn't like the way OpenSCAD
handled curves.
On Sun, Jul 5, 2026 at 7:27 AM Leonard Martin Struttmann via Discuss
discuss@lists.openscad.org wrote:
When I use rotate_extruded spheres, and then hull() each
sphere-cylinder combination, I get a "reasonably" good transition:
Screenshot 2026-07-05 at 06.15.28.png
However, I agree with Raymond. Since OpenSCAD approximates arcs
with segments, I doubt that there is a general solution. We could
"What if..." this to death.
Which begs the question: Could there ever be an evolutionary
change to OpenSCAD to optionally allow for purely mathematically
derived arcs?
SIDE QUESTIONS PROBABLY APPROPRIATE FOR ANOTHER FORUM
Are there other serious CAD programs that use purely
mathematically derived arcs? I imagine that there are. Once I
found OpenSCAD I stopped looking at other programs.
Are there CNC machines that use smooth motion motors (rather than
stepper motors) that could realize such models?
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What i was trying to say, without using some sort of
blending/hull/whatever for a coarsely segmented sphere and cylinders,
you cannot get the edges to match. For manifold spheres, you can get a
match for 90 deg. I'm not sure if there is any other construction of a
sphere that allows, say, 45 deg angles as well, without other manipulation.
Hulling is OK, but it distorts the facets of the sphere, but depending
on the ultimate objective of using faceted cylinders, then that may not
matter.
On 05/07/2026 14:41, Adrian Mariano via Discuss wrote:
> There is Doug Moen's "curv" program. https://curv3d.org/ I think he
> got inspired to write it because he didn't like the way OpenSCAD
> handled curves.
>
> On Sun, Jul 5, 2026 at 7:27 AM Leonard Martin Struttmann via Discuss
> <discuss@lists.openscad.org> wrote:
>
> When I use rotate_extruded spheres, and then hull() each
> sphere-cylinder combination, I get a "reasonably" good transition:
>
> Screenshot 2026-07-05 at 06.15.28.png
>
> However, I agree with Raymond. Since OpenSCAD approximates arcs
> with segments, I doubt that there is a general solution. We could
> "What if..." this to death.
>
> Which begs the question: Could there ever be an evolutionary
> change to OpenSCAD to optionally allow for purely mathematically
> derived arcs?
>
> SIDE QUESTIONS PROBABLY APPROPRIATE FOR ANOTHER FORUM
> Are there other serious CAD programs that use purely
> mathematically derived arcs? I imagine that there are. Once I
> found OpenSCAD I stopped looking at other programs.
>
> Are there CNC machines that use smooth motion motors (rather than
> stepper motors) that could realize such models?
>
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
>
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email todiscuss-leave@lists.openscad.org
