I am sort of new and I manage to get along but probably not in the best or most efficient way. I marvel at some of the code I see. I want to create this and want to know the best way. All I come up with is a series of thin triangles in a arc, each a different size. How do I do it? thanks Lee

If those a circular arcs, it's a really easy case for difference(). If not, you can probably still do it that way, but depending on how you want to define the curves, a chain hull might be easier. On Feb 25, 2021, 13:44 -0800, Lee A <683lee@337lee.com>, wrote: > I am sort of new and I manage to get along but probably not in the best > or most efficient way. I marvel at some of the code I see. I want to > create this and want to know the best way. All I come up with is a > series of thin triangles in a arc, each a different size. How do I do it? > > > > thanks > Lee > > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

I think you need to give more information about what you're trying to create. Is the shape defined by the dimensions of the triangles? The space between them? Or maybe by some dimensions and some angles? And then an altitude? Are the arcs circles? They don't look like it, so maybe not. What defines the arcs? I think knowing exactly what you're trying to create is an important first step. Leea wrote > I am sort of new and I manage to get along but probably not in the best > or most efficient way. I marvel at some of the code I see. I want to > create this and want to know the best way. All I come up with is a > series of thin triangles in a arc, each a different size. How do I do it? > > > > thanks > Lee > > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > curve.png (10K) > &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt; -- Sent from: http://forum.openscad.org/

I know about Hull but what is a Chain Hull? Lee On 2/25/2021 3:50 PM, Whosawhatsis wrote: > If those a circular arcs, it's a really easy case for difference(). If > not, you can probably still do it that way, but depending on how you > want to define the curves, a chain hull might be easier. > On Feb 25, 2021, 13:44 -0800, Lee A <683lee@337lee.com>, wrote: >> I am sort of new and I manage to get along but probably not in the best >> or most efficient way. I marvel at some of the code I see. I want to >> create this and want to know the best way. All I come up with is a >> series of thin triangles in a arc, each a different size. How do I do it? >> >> >> >> thanks >> Lee >> >> >> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

 Leea wrote
 I am sort of new and I manage to get along but probably not in the
 best
 or most efficient way. I marvel at some of the code I see. I want to
 create this and want to know the best way. All I come up with is a
 series of thin triangles in a arc, each a different size. How do I
 do it?



 thanks
 Lee




 _______________________________________________
 OpenSCAD mailing list
 [hidden email]
 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>
 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>


 curve.png (10K)
 <http://forum.openscad.org/attachment/31966/0/curve.png>
 <http://forum.openscad.org/attachment/31966/0/curve.png>>

It is defined by the dimensions of the triangles. I am trying to figure out how to explain it. Imagine a triangular 'rod' that diminishes in size in all three dimensions from one end to the other. Then bend that rod into a U shape. So it is a solid piece. The inner arc is small and could be a circle. The outer arc is almost half a circle but a bit elliptical. It could be circle if needed. Ideally the hypotenuse would be a little concave but I was going to live with straight. I was hoping a picture was worth a lot of words. Lee On 2/25/2021 3:59 PM, adrianv wrote: > I think you need to give more information about what you're trying to > create.  Is the shape defined by the dimensions of the triangles?  The > space between them?  Or maybe by some dimensions and some angles?  And > then an altitude?   Are the arcs circles? They don't look like it, so > maybe not.  What defines the arcs? > > I think knowing exactly what you're trying to create is an important > first step. > > Leea wrote > I am sort of new and I manage to get along but probably not in the > best > or most efficient way. I marvel at some of the code I see. I want to > create this and want to know the best way. All I come up with is a > series of thin triangles in a arc, each a different size. How do I > do it? > > > > thanks > Lee > > > > > _______________________________________________ > OpenSCAD mailing list > [hidden email] > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > curve.png (10K) > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png>> > > > ------------------------------------------------------------------------ > Sent from the OpenSCAD mailing list archive > <http://forum.openscad.org/> at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

 Leea wrote
 I am sort of new and I manage to get along but probably not in the
 best
 or most efficient way. I marvel at some of the code I see. I want to
 create this and want to know the best way. All I come up with is a
 series of thin triangles in a arc, each a different size. How do I
 do it?



 thanks
 Lee




 _______________________________________________
 OpenSCAD mailing list
 [hidden email]
 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>
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 curve.png (10K)
 <http://forum.openscad.org/attachment/31966/0/curve.png>
 <http://forum.openscad.org/attachment/31966/0/curve.png>>

Your picture looked like a flat 2d picture of triangles and an arc. So Is this sort of like what you're after? <http://forum.openscad.org/file/t2477/thing.png> Note: the triangles are coplanar but it doesn't look like it because of the shrinkage along the length which means the small one is not aligned with the big one. Leea wrote > It is defined by the dimensions of the triangles. > I am trying to figure out how to explain it. Imagine a triangular 'rod' > that diminishes in size in all three dimensions from one end to the > other. Then bend that rod into a U shape. So it is a solid piece. The > inner arc is small and could be a circle. The outer arc is almost half a > circle but a bit elliptical. It could be circle if needed. Ideally the > hypotenuse would be a little concave but I was going to live with > straight. I was hoping a picture was worth a lot of words. > > Lee > > On 2/25/2021 3:59 PM, adrianv wrote: >> I think you need to give more information about what you're trying to >> create.  Is the shape defined by the dimensions of the triangles?  The >> space between them?  Or maybe by some dimensions and some angles?  And >> then an altitude?   Are the arcs circles? They don't look like it, so >> maybe not.  What defines the arcs? >> >> I think knowing exactly what you're trying to create is an important >> first step. >> >> Leea wrote >> I am sort of new and I manage to get along but probably not in the >> best >> or most efficient way. I marvel at some of the code I see. I want to >> create this and want to know the best way. All I come up with is a >> series of thin triangles in a arc, each a different size. How do I >> do it? >> >> >> >> thanks >> Lee >> >> >> >> >> _______________________________________________ >> OpenSCAD mailing list >> [hidden email] >> &lt;/user/SendEmail.jtp?type=email&amp;email=Discuss%40.openscad&gt; >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt; >> >> >> curve.png (10K) >> &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt; >> &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt;> >> >> >> ------------------------------------------------------------------------ >> Sent from the OpenSCAD mailing list archive >> &lt;http://forum.openscad.org/&gt; at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> > Discuss@.openscad >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- Sent from: http://forum.openscad.org/

 Leea wrote
 It is defined by the dimensions of the triangles.
 I am trying to figure out how to explain it. Imagine a triangular
 'rod'
 that diminishes in size in all three dimensions from one end to the
 other. Then bend that rod into a U shape. So it is a solid piece. The
 inner arc is small and could be a circle. The outer arc is almost
 half a
 circle but a bit elliptical. It could be circle if needed. Ideally
 the
 hypotenuse would be a little concave but I was going to live with
 straight. I was hoping a picture was worth a lot of words.

 Lee

 On 2/25/2021 3:59 PM, adrianv wrote:

 trying to

 triangles?  The

 angles?  And

 it, so

 important

 in the

 want to

 with is a

 How do I

 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>

 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>
 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>>

 <http://forum.openscad.org/attachment/31966/0/curve.png>>

 <http://forum.openscad.org/attachment/31966/0/curve.png>>>

 ------------------------------------------------------------------------

 Nabble.com.

 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>

 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>


 _______________________________________________
 OpenSCAD mailing list
 [hidden email]
 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>
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 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>

It is supposed to be 3D. I would say the inverse of your image with the pointy tip on the inside. Take a bowl and pull/stretch the bottom center to the right side a bit. Then cut it in half vertically with the blade going left to right. Trying to go from my mind to your mind without telepathy and not coming up with the right words. How did you do your example? Maybe I can just reverse that. I would like to smooth it by using something better than triangles, some shape I design with rounding. Lee On 2/25/2021 4:37 PM, adrianv wrote: > Your picture looked like a flat 2d picture of triangles and an arc. >  So Is this sort of like what you're after? > > > > Note: the triangles are coplanar but it doesn't look like it because > of the shrinkage along the length which means the small one is not > aligned with the big one. > > Leea wrote > It is defined by the dimensions of the triangles. > I am trying to figure out how to explain it. Imagine a triangular > 'rod' > that diminishes in size in all three dimensions from one end to the > other. Then bend that rod into a U shape. So it is a solid piece. The > inner arc is small and could be a circle. The outer arc is almost > half a > circle but a bit elliptical. It could be circle if needed. Ideally > the > hypotenuse would be a little concave but I was going to live with > straight. I was hoping a picture was worth a lot of words. > > Lee > > On 2/25/2021 3:59 PM, adrianv wrote: > > I think you need to give more information about what you're > trying to > > create.  Is the shape defined by the dimensions of the > triangles?  The > > space between them?  Or maybe by some dimensions and some > angles?  And > > then an altitude?   Are the arcs circles? They don't look like > it, so > > maybe not.  What defines the arcs? > > > > I think knowing exactly what you're trying to create is an > important > > first step. > > > >     Leea wrote > >     I am sort of new and I manage to get along but probably not > in the > >     best > >     or most efficient way. I marvel at some of the code I see. I > want to > >     create this and want to know the best way. All I come up > with is a > >     series of thin triangles in a arc, each a different size. > How do I > >     do it? > > > > > > > >     thanks > >     Lee > > > > > > > > > >     _______________________________________________ > >     OpenSCAD mailing list > >     [hidden email] > > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > > > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > >     > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>> > > > > > >     curve.png (10K) > >     <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png>> > >     <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png>>> > > > > > > > ------------------------------------------------------------------------ > > > Sent from the OpenSCAD mailing list archive > > <http://forum.openscad.org/> <http://forum.openscad.org/>> at > Nabble.com. > > > > _______________________________________________ > > OpenSCAD mailing list > > [hidden email] > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > > > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > _______________________________________________ > OpenSCAD mailing list > [hidden email] > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > ------------------------------------------------------------------------ > Sent from the OpenSCAD mailing list archive > <http://forum.openscad.org/> at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

People seem to have a very hard time to imagine what you actually want. 1) Do I already have one of these in my home? 2) Is it a replacement part? 3) What does it have to mesh/interface with? 4) What are the critical or known dimensions? What dimensions don't really matter? 5) What are the critical areas in the shape? Distance between points on your drawing or radius of curves, etc. 6) If you don't bend it over, what would it look like (dimensions and important radia please) I don't recall seeing anything like this in my house. On 2021-02-25 6:19 p.m., Lee A wrote: > It is supposed to be 3D. > > I would say the inverse of your image with the pointy tip on the inside. > > Take a bowl and pull/stretch the bottom center to the right side a > bit. Then cut it in half vertically with the blade going left to > right. Trying to go from my mind to your mind without telepathy and > not coming up with the right words. > > How did you do your example? Maybe I can just reverse that. > > I would like to smooth it by using something better than triangles, > some shape I design with rounding. > > Lee > > On 2/25/2021 4:37 PM, adrianv wrote: >> Your picture looked like a flat 2d picture of triangles and an arc. >>  So Is this sort of like what you're after? >> >> >> >> Note: the triangles are coplanar but it doesn't look like it because >> of the shrinkage along the length which means the small one is not >> aligned with the big one. >> >>     Leea wrote >>     It is defined by the dimensions of the triangles. >>     I am trying to figure out how to explain it. Imagine a triangular >>     'rod' >>     that diminishes in size in all three dimensions from one end to the >>     other. Then bend that rod into a U shape. So it is a solid piece. >> The >>     inner arc is small and could be a circle. The outer arc is almost >>     half a >>     circle but a bit elliptical. It could be circle if needed. Ideally >>     the >>     hypotenuse would be a little concave but I was going to live with >>     straight. I was hoping a picture was worth a lot of words. >> >>     Lee >> >>     On 2/25/2021 3:59 PM, adrianv wrote: >>     > I think you need to give more information about what you're >>     trying to >>     > create.  Is the shape defined by the dimensions of the >>     triangles?  The >>     > space between them?  Or maybe by some dimensions and some >>     angles?  And >>     > then an altitude?   Are the arcs circles? They don't look like >>     it, so >>     > maybe not.  What defines the arcs? >>     > >>     > I think knowing exactly what you're trying to create is an >>     important >>     > first step. >>     > >>     >     Leea wrote >>     >     I am sort of new and I manage to get along but probably not >>     in the >>     >     best >>     >     or most efficient way. I marvel at some of the code I see. I >>     want to >>     >     create this and want to know the best way. All I come up >>     with is a >>     >     series of thin triangles in a arc, each a different size. >>     How do I >>     >     do it? >>     > >>     > >>     > >>     >     thanks >>     >     Lee >>     > >>     > >>     > >>     > >>     >     _______________________________________________ >>     >     OpenSCAD mailing list >>     >     [hidden email] >>     > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> >>     > >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >>     > >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>> >>     > >>     > >>     >     curve.png (10K) >>     > <http://forum.openscad.org/attachment/31966/0/curve.png> >> <http://forum.openscad.org/attachment/31966/0/curve.png>> >>     > <http://forum.openscad.org/attachment/31966/0/curve.png> >> <http://forum.openscad.org/attachment/31966/0/curve.png>>> >>     > >>     > >>     > >> ------------------------------------------------------------------------ >> >>     > Sent from the OpenSCAD mailing list archive >>     > <http://forum.openscad.org/> <http://forum.openscad.org/>> at >>     Nabble.com. >>     > >>     > _______________________________________________ >>     > OpenSCAD mailing list >>     > [hidden email] >> </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> >>     > >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >> >> >>     _______________________________________________ >>     OpenSCAD mailing list >>     [hidden email] >> </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >> >> >> ------------------------------------------------------------------------ >> Sent from the OpenSCAD mailing list archive >> <http://forum.openscad.org/> at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- Ron Wheeler Artifact Software 438-345-3369 rwheeler@artifact-software.com

 Leea wrote
 It is defined by the dimensions of the triangles.
 I am trying to figure out how to explain it. Imagine a triangular
 'rod'
 that diminishes in size in all three dimensions from one end to the
 other. Then bend that rod into a U shape. So it is a solid piece. The
 inner arc is small and could be a circle. The outer arc is almost
 half a
 circle but a bit elliptical. It could be circle if needed. Ideally
 the
 hypotenuse would be a little concave but I was going to live with
 straight. I was hoping a picture was worth a lot of words.

 Lee

 On 2/25/2021 3:59 PM, adrianv wrote:

 trying to

 triangles?  The

 angles?  And

 it, so

 important

 Leea wrote
 I am sort of new and I manage to get along but probably not

 in the

 best
 or most efficient way. I marvel at some of the code I see. I

 want to

 create this and want to know the best way. All I come up

 with is a

 series of thin triangles in a arc, each a different size.

 How do I

 do it?



 thanks
 Lee




 _______________________________________________
 OpenSCAD mailing list
 [hidden email]

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 curve.png (10K)
 <http://forum.openscad.org/attachment/31966/0/curve.png>

 <http://forum.openscad.org/attachment/31966/0/curve.png>

 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>

 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

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It looks like a simplified version of an amphitheater (instead of steps, the smooth hypotenuse of a triangle) where the triangle shrinks as it moves around. The bottom side appears (in his first drawing) to be flat and flush with a horizontal surface. Also, instead of being bent along a semicircle, as the poster mentions it is bent along a U. The poster makes it a little more complicated by saying the curved part of the U is not circular but elliptical (and then even more complicated saying the hypotenuse should be concave). No dimensions have been specified, relative dimensions would help. Likewise, something describing the curvatures would also help (when you say "elliptical" do you mean like a standard ellipse, or a parabola, or hyperbolic curves....) On Thu, Feb 25, 2021 at 9:23 PM Ron Wheeler via Discuss < discuss@lists.openscad.org> wrote: > People seem to have a very hard time to imagine what you actually want. > > 1) Do I already have one of these in my home? > 2) Is it a replacement part? > 3) What does it have to mesh/interface with? > 4) What are the critical or known dimensions? What dimensions don't really > matter? > 5) What are the critical areas in the shape? Distance between points on > your drawing or radius of curves, etc. > 6) If you don't bend it over, what would it look like (dimensions and > important radia please) > > I don't recall seeing anything like this in my house. > > On 2021-02-25 6:19 p.m., Lee A wrote: > > It is supposed to be 3D. > > I would say the inverse of your image with the pointy tip on the inside. > > Take a bowl and pull/stretch the bottom center to the right side a bit. > Then cut it in half vertically with the blade going left to right. Trying > to go from my mind to your mind without telepathy and not coming up with > the right words. > > How did you do your example? Maybe I can just reverse that. > > I would like to smooth it by using something better than triangles, some > shape I design with rounding. > > Lee > > On 2/25/2021 4:37 PM, adrianv wrote: > > Your picture looked like a flat 2d picture of triangles and an arc. So Is > this sort of like what you're after? > > > > Note: the triangles are coplanar but it doesn't look like it because of > the shrinkage along the length which means the small one is not aligned > with the big one. > > Leea wrote > It is defined by the dimensions of the triangles. > I am trying to figure out how to explain it. Imagine a triangular > 'rod' > that diminishes in size in all three dimensions from one end to the > other. Then bend that rod into a U shape. So it is a solid piece. The > inner arc is small and could be a circle. The outer arc is almost > half a > circle but a bit elliptical. It could be circle if needed. Ideally > the > hypotenuse would be a little concave but I was going to live with > straight. I was hoping a picture was worth a lot of words. > > Lee > > On 2/25/2021 3:59 PM, adrianv wrote: > > I think you need to give more information about what you're > trying to > > create. Is the shape defined by the dimensions of the > triangles? The > > space between them? Or maybe by some dimensions and some > angles? And > > then an altitude? Are the arcs circles? They don't look like > it, so > > maybe not. What defines the arcs? > > > > I think knowing exactly what you're trying to create is an > important > > first step. > > > > Leea wrote > > I am sort of new and I manage to get along but probably not > in the > > best > > or most efficient way. I marvel at some of the code I see. I > want to > > create this and want to know the best way. All I come up > with is a > > series of thin triangles in a arc, each a different size. > How do I > > do it? > > > > > > > > thanks > > Lee > > > > > > > > > > _______________________________________________ > > OpenSCAD mailing list > > [hidden email] > > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > > > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>> > > > > > > curve.png (10K) > > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png>> > > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png> > <http://forum.openscad.org/attachment/31966/0/curve.png>>> > > > > > > > > ------------------------------------------------------------------------ > > > Sent from the OpenSCAD mailing list archive > > <http://forum.openscad.org/> <http://forum.openscad.org/> > <http://forum.openscad.org/> <http://forum.openscad.org/>> at > Nabble.com. > > > > _______________________________________________ > > OpenSCAD mailing list > > [hidden email] > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > > > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > _______________________________________________ > OpenSCAD mailing list > [hidden email] > </user/SendEmail.jtp?type=email&email=Discuss%40.openscad> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> > > > ------------------------------------------------------------------------ > Sent from the OpenSCAD mailing list archive <http://forum.openscad.org/> > <http://forum.openscad.org/> at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > -- > Ron Wheeler > Artifact Software > 438-345-3369rwheeler@artifact-software.com > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 Leea wrote
 It is defined by the dimensions of the triangles.
 I am trying to figure out how to explain it. Imagine a triangular
 'rod'
 that diminishes in size in all three dimensions from one end to the
 other. Then bend that rod into a U shape. So it is a solid piece. The
 inner arc is small and could be a circle. The outer arc is almost
 half a
 circle but a bit elliptical. It could be circle if needed. Ideally
 the
 hypotenuse would be a little concave but I was going to live with
 straight. I was hoping a picture was worth a lot of words.

 Lee

 On 2/25/2021 3:59 PM, adrianv wrote:

 trying to

 triangles?  The

 angles?  And

 it, so

 important

 in the

 want to

 with is a

 How do I

 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

 <http://forum.openscad.org/attachment/31966/0/curve.png>>

 <http://forum.openscad.org/attachment/31966/0/curve.png>>>

 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>

 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

 _______________________________________________
 OpenSCAD mailing list
 [hidden email]
 </user/SendEmail.jtp?type=email&email=Discuss%40.openscad>
 http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

In OpenSCAD ultimately everything is a triangle. (Maybe you can make rectangles too?) There are no curves. So I'm not sure what you're hoping for about "something better than triangles". Do you mean for the end of the shape? You said you want the hypotenuse a little concave? So here's a new version. My code is based on the BOSL2 library. You might be able to make a shape like this without a library by subtracting a sphere from a cylinder. It would be more symmetric, though. The outer arc of th shape produced by the code below is *not* a circle. https://github.com/revarbat/BOSL2/wiki include <BOSL2/std.scad> include <BOSL2/skin.scad> include <BOSL2/turtle3d.scad> include <BOSL2/rounding.scad> $fn=128; width = 10; height = 8; curve=2; // Amount to curve hypotenuse inward normal = line_normal([[-height,width],[0,0]]); //triangle = [[-height,width],[0,0],[0,width]]; // Straight side triangle triangle = [ each arc(points=[[-height,width], [-height,width]/2+normal*curve, [0,0]]), [0,0], [0,width] ]; trans = turtle3d([ ["arc", 4, "right", 180, "shrink", 2] ],transforms=true); sweep(triangle, trans); <http://forum.openscad.org/file/t2477/thing2.png> Leea wrote > It is supposed to be 3D. > > I would say the inverse of your image with the pointy tip on the inside. > > Take a bowl and pull/stretch the bottom center to the right side a bit. > Then cut it in half vertically with the blade going left to right. > Trying to go from my mind to your mind without telepathy and not coming > up with the right words. > > How did you do your example? Maybe I can just reverse that. > > I would like to smooth it by using something better than triangles, some > shape I design with rounding. > > Lee > > On 2/25/2021 4:37 PM, adrianv wrote: >> Your picture looked like a flat 2d picture of triangles and an arc. >>  So Is this sort of like what you're after? >> >> >> >> Note: the triangles are coplanar but it doesn't look like it because >> of the shrinkage along the length which means the small one is not >> aligned with the big one. >> >> Leea wrote >> It is defined by the dimensions of the triangles. >> I am trying to figure out how to explain it. Imagine a triangular >> 'rod' >> that diminishes in size in all three dimensions from one end to the >> other. Then bend that rod into a U shape. So it is a solid piece. The >> inner arc is small and could be a circle. The outer arc is almost >> half a >> circle but a bit elliptical. It could be circle if needed. Ideally >> the >> hypotenuse would be a little concave but I was going to live with >> straight. I was hoping a picture was worth a lot of words. >> >> Lee >> >> On 2/25/2021 3:59 PM, adrianv wrote: >> > I think you need to give more information about what you're >> trying to >> > create.  Is the shape defined by the dimensions of the >> triangles?  The >> > space between them?  Or maybe by some dimensions and some >> angles?  And >> > then an altitude?   Are the arcs circles? They don't look like >> it, so >> > maybe not.  What defines the arcs? >> > >> > I think knowing exactly what you're trying to create is an >> important >> > first step. >> > >> >     Leea wrote >> >     I am sort of new and I manage to get along but probably not >> in the >> >     best >> >     or most efficient way. I marvel at some of the code I see. I >> want to >> >     create this and want to know the best way. All I come up >> with is a >> >     series of thin triangles in a arc, each a different size. >> How do I >> >     do it? >> > >> > >> > >> >     thanks >> >     Lee >> > >> > >> > >> > >> >     _______________________________________________ >> >     OpenSCAD mailing list >> >     [hidden email] >> > >> &lt;/user/SendEmail.jtp?type=email&amp;email=Discuss%40.openscad&gt; >> > >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt; >> >     >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt; >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt;> >> > >> > >> >     curve.png (10K) >> >     &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt; >> &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt;> >> >     &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt; >> &lt;http://forum.openscad.org/attachment/31966/0/curve.png&gt;>> >> > >> > >> > >> >> ------------------------------------------------------------------------ >> >> > Sent from the OpenSCAD mailing list archive >> > &lt;http://forum.openscad.org/&gt; >> &lt;http://forum.openscad.org/&gt;> at >> Nabble.com. >> > >> > _______________________________________________ >> > OpenSCAD mailing list >> > [hidden email] >> &lt;/user/SendEmail.jtp?type=email&amp;email=Discuss%40.openscad&gt; >> > >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt; >> >> >> _______________________________________________ >> OpenSCAD mailing list >> [hidden email] >> &lt;/user/SendEmail.jtp?type=email&amp;email=Discuss%40.openscad&gt; >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> &lt;http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org&gt; >> >> >> ------------------------------------------------------------------------ >> Sent from the OpenSCAD mailing list archive >> &lt;http://forum.openscad.org/&gt; at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> > Discuss@.openscad >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- Sent from: http://forum.openscad.org/