for(i=[0:5]){ 

    sign=(i%2==0) ? 1 : -1;

    

    translate([offset*2*i,0,0])

    rotate_extrude(angle=sign*180)

    translate([offset,0])

    circle(r=radius);

}

Is there a way to make this simple shape bend into a circle? … and keep the render time under an hour… 😊 $fn=40; radius=.5; offset=radius*2; for(i=[0:5]){ sign=(i%2==0) ? 1 : -1; translate([offset*2*i,0,0]) rotate_extrude(angle=sign*180) translate([offset,0]) circle(r=radius); }

Is the circle in the x/y plane or the x/z plane? -- Sent from: http://forum.openscad.org/

I would generate the path as a list of points and then sweep a circle along the path. It would render almost instantly. On Wed, 9 Dec 2020 at 15:43, fred_dot_u via Discuss < discuss@lists.openscad.org> wrote: > Is the circle in the x/y plane or the x/z plane? > > > > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

Any chance you could provide a simple example? I’ve never swept anything along a path… From: nop head <nop.head@gmail.com> Sent: Wednesday, December 9, 2020 8:47 AM To: OpenSCAD general discussion <discuss@lists.openscad.org> Subject: Re: [OpenSCAD] bending a shape that's only slightly complex I would generate the path as a list of points and then sweep a circle along the path. It would render almost instantly. On Wed, 9 Dec 2020 at 15:43, fred_dot_u via Discuss <discuss@lists.openscad.org <mailto:discuss@lists.openscad.org> > wrote: Is the circle in the x/y plane or the x/z plane? -- Sent from: http://forum.openscad.org/ _______________________________________________ OpenSCAD mailing list Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

*for(i=[0:5]){
    sign=(i%2==0) ? 1 : -1;
    translate([offset*2*i,0,0])
    rotate_extrude(angle=sign*180)
    translate([offset,0])
    circle(r=radius);
}

Here is a possible code. The module path_sweep() is part of BOSL2 and sweep() is the classical one. $fn=40; radius=.5; offset=radius*2; *for(i=[0:5]){ sign=(i%2==0) ? 1 : -1; translate([offset*2*i,0,0]) rotate_extrude(angle=sign*180) translate([offset,0]) circle(r=radius); } path = [for(i=[0:5],s=(i%2==0)? 1 : -1, a=[0:360/$fn:180-360/$fn]) offset*[2*i-cos(s*a), sin(s*a),0] ]; function bend_xz(p) = let( perim = abs(p[len(p)-1].x-p[0].x), r = perim/PI/2 ) [for(pi=p) [r*cos(360*pi.x/perim), pi.y,r*sin(360*pi.x/perim)] ]; //path_sweep(circle(radius),bend_xz(path),closed=true); sweep(circle(radius),bend_xz(path),closed=true); [image: bend.PNG] Em qua., 9 de dez. de 2020 às 20:32, <ken@volksswitch.org> escreveu: > Any chance you could provide a simple example? I’ve never swept anything > along a path… > > > > *From:* nop head <nop.head@gmail.com> > *Sent:* Wednesday, December 9, 2020 8:47 AM > *To:* OpenSCAD general discussion <discuss@lists.openscad.org> > *Subject:* Re: [OpenSCAD] bending a shape that's only slightly complex > > > > I would generate the path as a list of points and then sweep a circle > along the path. It would render almost instantly. > > > > On Wed, 9 Dec 2020 at 15:43, fred_dot_u via Discuss < > discuss@lists.openscad.org> wrote: > > Is the circle in the x/y plane or the x/z plane? > > > > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > 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 >

khackbarth wrote > Is there a way to make this simple shape bend into a circle? … and keep > the render time under an hour… 😊 Since you haven't responded to the question of which plane you want the circle on, and you have not responded to the suggestions, Untitled.png <http://forum.openscad.org/file/t2121/Untitled.png> here's my take on it. $fn=40; radius=.5; offset=radius*2; rotate_extrude() { translate ([10,10,0]) projection() for(i=[0:5]){ sign=(i%2==0) ? 1 : -1; translate([offset*2*i,0,0]) rotate_extrude(angle=sign*180) translate([offset,0]) circle(r=radius); } } -- Sent from: http://forum.openscad.org/

I received a reply, which apparently didn't make it to the list/forum that the objective is to circle the wagons in the x/y plane. My interpretation in 2D is the image above. If I knew how to make it in 3D, I'd stuff the code in here. If the OP thinks my interpretation is incorrect, I hope it will be corrected. I'm looking forward to the solution. <http://forum.openscad.org/file/t824/squiggle.png> -- Sent from: http://forum.openscad.org/

Hi Larry, I did reply but my email program inserted only the direct address to fred_dot_u. I told him X/Y. Thanks for your input. Ken -----Original Message----- From: lar3ry <lar3ry@sasktel.net> Sent: Thursday, December 10, 2020 9:26 AM To: discuss@lists.openscad.org Subject: Re: [OpenSCAD] bending a shape that's only slightly complex khackbarth wrote > Is there a way to make this simple shape bend into a circle? … and > keep the render time under an hour… 😊 Since you haven't responded to the question of which plane you want the circle on, and you have not responded to the suggestions, Untitled.png <http://forum.openscad.org/file/t2121/Untitled.png> here's my take on it. $fn=40; radius=.5; offset=radius*2; rotate_extrude() { translate ([10,10,0]) projection() for(i=[0:5]){ sign=(i%2==0) ? 1 : -1; translate([offset*2*i,0,0]) rotate_extrude(angle=sign*180) translate([offset,0]) circle(r=radius); } } -- Sent from: http://forum.openscad.org/

 *for(i=[0:5]){
     sign=(i%2==0) ? 1 : -1;
     translate([offset*2*i,0,0])
     rotate_extrude(angle=sign*180)
     translate([offset,0])
     circle(r=radius);
 }

Running stock OpenSCAD version 2019.05 on Mac OS (Big Sur, M1, Rosetta2 Intel emulation), there is no command sweep(), I get the error "WARNING: Ignoring unknown module 'sweep', in file ./, line 22." And what is BOSL2? Yeah, 3 years using OpenSCAD, and I still call myself a newbie. Sorry. Ronaldo wrote > Here is a possible code. The module path_sweep() is part of BOSL2 and > sweep() is the classical one. > > $fn=40; > radius=.5; > offset=radius*2; > > *for(i=[0:5]){ > sign=(i%2==0) ? 1 : -1; > translate([offset*2*i,0,0]) > rotate_extrude(angle=sign*180) > translate([offset,0]) > circle(r=radius); > } > > path = [for(i=[0:5],s=(i%2==0)? 1 : -1, a=[0:360/$fn:180-360/$fn]) > offset*[2*i-cos(s*a), sin(s*a),0] ]; > > function bend_xz(p) = > let( perim = abs(p[len(p)-1].x-p[0].x), > r = perim/PI/2 ) > [for(pi=p) [r*cos(360*pi.x/perim), pi.y,r*sin(360*pi.x/perim)] ]; > > //path_sweep(circle(radius),bend_xz(path),closed=true); > sweep(circle(radius),bend_xz(path),closed=true); > > > [image: bend.PNG] > > Em qua., 9 de dez. de 2020 às 20:32, &lt; > ken@ > &gt; escreveu: > >> Any chance you could provide a simple example? I’ve never swept anything >> along a path… >> >> >> >> *From:* nop head &lt; > nop.head@ > &gt; >> *Sent:* Wednesday, December 9, 2020 8:47 AM >> *To:* OpenSCAD general discussion &lt; > discuss@.openscad > &gt; >> *Subject:* Re: [OpenSCAD] bending a shape that's only slightly complex >> >> >> >> I would generate the path as a list of points and then sweep a circle >> along the path. It would render almost instantly. >> >> >> >> On Wed, 9 Dec 2020 at 15:43, fred_dot_u via Discuss < >> > discuss@.openscad >> wrote: >> >> Is the circle in the x/y plane or the x/z plane? >> >> >> >> -- >> Sent from: http://forum.openscad.org/ >> >> _______________________________________________ >> 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 >> > > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > bend.PNG (29K) > &lt;http://forum.openscad.org/attachment/31065/0/bend.PNG&gt; ----- Make things, travel and tell stories. -- Sent from: http://forum.openscad.org/

Answered "What is BOSL2?" for myself, disregard that question :D Cheers ----- Make things, travel and tell stories. -- Sent from: http://forum.openscad.org/