BS
Brendan Sleight
Mon, Nov 7, 2022 8:00 PM

See the following which all support continuous curvature rounding:

Nice library BOSL2 -  I like it! Gives ~ identical output:-

``````include <BOSL2/std.scad>

ten = square(50);
translate([0,0,10]) linear_extrude(height=10) {
polygon(round_corners(ten,  method="smooth", cut=5.63, \$fn=60*4));
}

color("red") squircle([50,50,10], r=25, center=false);
``````

https://imgur.com/lrO4URm.png

> See the following which all support continuous curvature rounding: > https://github.com/revarbat/BOSL2/wiki/rounding.scad#function-round_corners Nice library BOSL2 - I like it! Gives ~ identical output:- include <BOSL2/std.scad> include <BOSL2/rounding.scad> include <squircle.scad> ten = square(50); translate([0,0,10]) linear_extrude(height=10) { polygon(round_corners(ten, method="smooth", cut=5.63, \$fn=60*4)); } color("red") squircle([50,50,10], r=25, center=false); https://imgur.com/lrO4URm.png
AM
Mon, Nov 7, 2022 9:52 PM

The BOSL2 output is not identical to squircle.  It is similar, but not the
same.  BOSL2 uses a 4th order bezier which cannot match the superellipse,
or even a regular ellipse.  If you take difference of the two shapes you
can see how they aren't the same.

On Mon, Nov 7, 2022 at 3:03 PM Brendan Sleight bms@barwap.com wrote:

See the following which all support continuous curvature rounding:

Nice library BOSL2 -  I like it! Gives ~ identical output:-

`````` include <BOSL2/std.scad>

ten = square(50);
translate([0,0,10]) linear_extrude(height=10) {
polygon(round_corners(ten,  method="smooth", cut=5.63, \$fn=60*4));
}

color("red") squircle([50,50,10], r=25, center=false);
``````

https://imgur.com/lrO4URm.png

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The BOSL2 output is not identical to squircle. It is similar, but not the same. BOSL2 uses a 4th order bezier which cannot match the superellipse, or even a regular ellipse. If you take difference of the two shapes you can see how they aren't the same. On Mon, Nov 7, 2022 at 3:03 PM Brendan Sleight <bms@barwap.com> wrote: > > See the following which all support continuous curvature rounding: > > > https://github.com/revarbat/BOSL2/wiki/rounding.scad#function-round_corners > > Nice library BOSL2 - I like it! Gives ~ identical output:- > > include <BOSL2/std.scad> > include <BOSL2/rounding.scad> > include <squircle.scad> > > ten = square(50); > translate([0,0,10]) linear_extrude(height=10) { > polygon(round_corners(ten, method="smooth", cut=5.63, \$fn=60*4)); > } > > color("red") squircle([50,50,10], r=25, center=false); > > https://imgur.com/lrO4URm.png > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >
BS
Brendan Sleight
Mon, Nov 7, 2022 10:28 PM

The BOSL2 output is not identical to squircle.  It is similar, but not the
same.

Agreed

~ identical

Was shorthand for approximately identical

difference of the two shapes you can see how they aren't the same.

Yep, my maths is not good enough to work out the magnitude, but I
guess it's below the resolution of my printer.

https://imgur.com/rzwQ39f.png

On Mon, 7 Nov 2022 at 20:00, Brendan Sleight bms@barwap.com wrote:

See the following which all support continuous curvature rounding:

Nice library BOSL2 -  I like it! Gives ~ identical output:-

`````` include <BOSL2/std.scad>