operating on BOSL2 2D lists of points
I want to sweep a 2D object that consists of a square subtracted from a
circle. I see how BOSL2 can return either a square or a circle as a "2D
path/list of points", but I cannot see how one can manipulate (subtract,
difference) those two lists to create a third list that is the difference.
Jon
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In BOSL2 a "region" is a path with zero or more holes in it. I think a
region is a list of paths with the first path being the outer path and
additional paths defining the holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square subtracted from a
circle. I see how BOSL2 can return either a square or a circle as a "2D
path/list of points", but I cannot see how one can manipulate (subtract,
difference) those two lists to create a third list that is the difference.
Jon
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I think you gave me a definition. I was looking for how to perform operations, like difference(), if that is possible
On 12/6/2025 7:48 PM, Todd Allen wrote:
In BOSL2 a "region" is a path with zero or more holes in it. I think a region is a list of paths with the first path being the outer path and additional paths defining the holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss <discuss@lists.openscad.orgmailto:discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square subtracted from a
circle. I see how BOSL2 can return either a square or a circle as a "2D
path/list of points", but I cannot see how one can manipulate (subtract,
difference) those two lists to create a third list that is the difference.
Jon
--
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include <BOSL2/std.scad>
s = square(20, center=true);
c = circle(r=8, $fn=40);
sh = difference(s, c);
region(sh);
[image: image.png]
On Sat, Dec 6, 2025 at 5:02 PM jon jonbondy.com via Discuss <
discuss@lists.openscad.org> wrote:
I think you gave me a definition. I was looking for how to perform
operations, like difference(), if that is possible
On 12/6/2025 7:48 PM, Todd Allen wrote:
In BOSL2 a "region" is a path with zero or more holes in it. I think a
region is a list of paths with the first path being the outer path and
additional paths defining the holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square subtracted from a
circle. I see how BOSL2 can return either a square or a circle as a "2D
path/list of points", but I cannot see how one can manipulate (subtract,
difference) those two lists to create a third list that is the
difference.
Jon
--
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Thanks, but...
this
include <BOSL2/std.scad> c = right(5) circle(r = 5); s = translate([6,
-1]) square([4, 2]); sh = difference(c, s);
produces this
Parsing design (AST generation)...
Saved backup file:
C:/Users/jon/OneDrive/Documents/OpenSCAD/backups/Brian Griggs
Screw-backup-ALqlHngx.scad
ERROR: Parser error: syntax error in file ., line 3
Execution aborted
with the error cursor on the left paren of the circle()
On 12/6/2025 9:19 PM, Dan Perry via Discuss wrote:
include <BOSL2/std.scad>
s = square(20, center=true);
c = circle(r=8, $fn=40);
sh = difference(s, c);
region(sh);
image.png
On Sat, Dec 6, 2025 at 5:02 PM jon jonbondy.com
https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=5F1_ORH2iq5gReDZX3C3DgF0ZLMpShDqzOievQ7FFhC3UBCyj0mQ4fXulK2Qaixe&s=udrpaIIKJ2JEokf7IzyCORri-4ZF3e8RdCdLNQX9ruU&e=
via Discuss discuss@lists.openscad.org wrote:
I think you gave me a definition. I was looking for how to
perform operations, like difference(), if that is possible
On 12/6/2025 7:48 PM, Todd Allen wrote:
In BOSL2 a "region" is a path with zero or more holes in it. I
think a region is a list of paths with the first path being the
outer path and additional paths defining the holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss
<discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square
subtracted from a
circle. I see how BOSL2 can return either a square or a
circle as a "2D
path/list of points", but I cannot see how one can manipulate
(subtract,
difference) those two lists to create a third list that is
the difference.
Jon
--
This email has been checked for viruses by AVG antivirus
software.
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c = right(5) circle(r = 5);
Module invocations can be chained, functions must be nested to pass the
return value as a parameter to another. Try:
c = right(5, circle(r=5));
On Sat, Dec 6, 2025 at 9:07 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
Thanks, but...
this
include <BOSL2/std.scad> c = right(5) circle(r = 5); s = translate([6,
-1]) square([4, 2]); sh = difference(c, s);
produces this
Parsing design (AST generation)...
Saved backup file: C:/Users/jon/OneDrive/Documents/OpenSCAD/backups/Brian
Griggs Screw-backup-ALqlHngx.scad
ERROR: Parser error: syntax error in file ., line 3
Execution aborted
with the error cursor on the left paren of the circle()
On 12/6/2025 9:19 PM, Dan Perry via Discuss wrote:
include <BOSL2/std.scad>
s = square(20, center=true);
c = circle(r=8, $fn=40);
sh = difference(s, c);
region(sh);
[image: image.png]
On Sat, Dec 6, 2025 at 5:02 PM jon jonbondy.com
https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=5F1_ORH2iq5gReDZX3C3DgF0ZLMpShDqzOievQ7FFhC3UBCyj0mQ4fXulK2Qaixe&s=udrpaIIKJ2JEokf7IzyCORri-4ZF3e8RdCdLNQX9ruU&e=
via Discuss discuss@lists.openscad.org wrote:
I think you gave me a definition. I was looking for how to perform
operations, like difference(), if that is possible
On 12/6/2025 7:48 PM, Todd Allen wrote:
In BOSL2 a "region" is a path with zero or more holes in it. I think a
region is a list of paths with the first path being the outer path and
additional paths defining the holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square subtracted from a
circle. I see how BOSL2 can return either a square or a circle as a "2D
path/list of points", but I cannot see how one can manipulate (subtract,
difference) those two lists to create a third list that is the
difference.
Jon
--
This email has been checked for viruses by AVG antivirus software.
www.avg.com
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=RjDcEeyB_RayZwbO2XTnMISeptHQUcKeEcafHQUFc33VqhS2l-4zsHZxJ9lh8A_D&s=QmF1jcpwxWNJb1lT0tpOngOFDGaNt5eOMWzxTAijY7k&e=
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That was it! Thank you!
On 12/6/2025 10:21 PM, Todd Allen via Discuss wrote:
c = right(5) circle(r = 5);
Module invocations can be chained, functions must be nested to pass
the return value as a parameter to another. Try:
c = right(5, circle(r=5));
On Sat, Dec 6, 2025 at 9:07 PM Jon Bondy via Discuss
discuss@lists.openscad.org wrote:
Thanks, but...
this
include <BOSL2/std.scad> c = right(5) circle(r = 5); s =
translate([6, -1]) square([4, 2]); sh = difference(c, s);
produces this
Parsing design (AST generation)...
Saved backup file:
C:/Users/jon/OneDrive/Documents/OpenSCAD/backups/Brian Griggs
Screw-backup-ALqlHngx.scad
ERROR: Parser error: syntax error in file ., line 3
Execution aborted
with the error cursor on the left paren of the circle()
On 12/6/2025 9:19 PM, Dan Perry via Discuss wrote:
include <BOSL2/std.scad>
s = square(20, center=true);
c = circle(r=8, $fn=40);
sh = difference(s, c);
region(sh);
image.png
On Sat, Dec 6, 2025 at 5:02 PM jon jonbondy.com
<https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=5F1_ORH2iq5gReDZX3C3DgF0ZLMpShDqzOievQ7FFhC3UBCyj0mQ4fXulK2Qaixe&s=udrpaIIKJ2JEokf7IzyCORri-4ZF3e8RdCdLNQX9ruU&e=>
via Discuss <discuss@lists.openscad.org> wrote:
I think you gave me a definition. I was looking for how to
perform operations, like difference(), if that is possible
On 12/6/2025 7:48 PM, Todd Allen wrote:
In BOSL2 a "region" is a path with zero or more holes in
it. I think a region is a list of paths with the first
path being the outer path and additional paths defining the
holes.
On Sat, Dec 6, 2025, 5:31 PM Jon Bondy via Discuss
<discuss@lists.openscad.org> wrote:
I want to sweep a 2D object that consists of a square
subtracted from a
circle. I see how BOSL2 can return either a square or a
circle as a "2D
path/list of points", but I cannot see how one can
manipulate (subtract,
difference) those two lists to create a third list that
is the difference.
Jon
--
This email has been checked for viruses by AVG antivirus
software.
www.avg.com
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