BOSL2 mystery
I am sure that the explanation will be obvious once it is explained to
me, but the following code produces the following error. The two
stroke()s work, so the "path" and "two" should be OK (at least in some
sense). I started out with 2-vectors, but added the 3rd zero (for Z) as
voodoo programming, trying to honor the mysterious error message.
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
path = [for (theta = [180:5:360])
[10cos(theta), 10sin(theta), 0],
[10, 0, 0], [10, 20, 0]];
stroke(path);
two = [
circle(d = 6),
back(10, right(-3, square(6)))
];
stroke(two);
path_sweep(hull_region(two), path);
ERROR: Assertion 'yvalid' failed: "Input y must be a length 3 vector" in
file , line 1323
TRACE: called by 'frame_map' in file , line 2286
TRACE: called by 'path_sweep' in file , line 2141
TRACE: assignment to "trans_scale" in file , line 2141
TRACE: called by 'path_sweep' in file Cane Crook Jig.scad, line 19
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Problem is caused by the duplicate point [10,0,0] in your path.
On Sun, Dec 21, 2025 at 9:28 AM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I am sure that the explanation will be obvious once it is explained to me,
but the following code produces the following error. The two stroke()s
work, so the "path" and "two" should be OK (at least in some sense). I
started out with 2-vectors, but added the 3rd zero (for Z) as voodoo
programming, trying to honor the mysterious error message.
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
path = [for (theta = [180:5:360])
[10cos(theta), 10sin(theta), 0],
[10, 0, 0], [10, 20, 0]];
stroke(path);
two = [
circle(d = 6),
back(10, right(-3, square(6)))
];
stroke(two);
path_sweep(hull_region(two), path);
ERROR: Assertion 'yvalid' failed: "Input y must be a length 3 vector" in
file , line 1323
TRACE: called by 'frame_map' in file , line 2286
TRACE: called by 'path_sweep' in file , line 2141
TRACE: assignment to "trans_scale" in file , line 2141
TRACE: called by 'path_sweep' in file Cane Crook Jig.scad, line 19
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Adrian:
Thanks for your help!
Is there an easy way that I could have deduced this from the provided
error messages?
Jon
On 12/21/2025 9:40 AM, Adrian Mariano via Discuss wrote:
Problem is caused by the duplicate point [10,0,0] in your path.
On Sun, Dec 21, 2025 at 9:28 AM Jon Bondy via Discuss
discuss@lists.openscad.org wrote:
I am sure that the explanation will be obvious once it is
explained to me, but the following code produces the following
error. The two stroke()s work, so the "path" and "two" should be
OK (at least in some sense). I started out with 2-vectors, but
added the 3rd zero (for Z) as voodoo programming, trying to honor
the mysterious error message.
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
path = [for (theta = [180:5:360])
[10*cos(theta), 10*sin(theta), 0],
[10, 0, 0], [10, 20, 0]];
stroke(path);
two = [
circle(d = 6),
back(10, right(-3, square(6)))
];
stroke(two);
path_sweep(hull_region(two), path);
ERROR: Assertion 'yvalid' failed: "Input y must be a length 3
vector" in file , line 1323
TRACE: called by 'frame_map' in file , line 2286
TRACE: called by 'path_sweep' in file , line 2141
TRACE: assignment to "trans_scale" in file , line 2141
TRACE: called by 'path_sweep' in file Cane Crook Jig.scad, line 19
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No, there is absolutely not a way you could have figured this out from the
error messages. I'm pondering the situation.
On Sun, Dec 21, 2025 at 9:49 AM Jon Bondy jon@jonbondy.com wrote:
Adrian:
Thanks for your help!
Is there an easy way that I could have deduced this from the provided
error messages?
Jon
On 12/21/2025 9:40 AM, Adrian Mariano via Discuss wrote:
Problem is caused by the duplicate point [10,0,0] in your path.
On Sun, Dec 21, 2025 at 9:28 AM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I am sure that the explanation will be obvious once it is explained to
me, but the following code produces the following error. The two stroke()s
work, so the "path" and "two" should be OK (at least in some sense). I
started out with 2-vectors, but added the 3rd zero (for Z) as voodoo
programming, trying to honor the mysterious error message.
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
path = [for (theta = [180:5:360])
[10cos(theta), 10sin(theta), 0],
[10, 0, 0], [10, 20, 0]];
stroke(path);
two = [
circle(d = 6),
back(10, right(-3, square(6)))
];
stroke(two);
path_sweep(hull_region(two), path);
ERROR: Assertion 'yvalid' failed: "Input y must be a length 3 vector" in
file , line 1323
TRACE: called by 'frame_map' in file , line 2286
TRACE: called by 'path_sweep' in file , line 2141
TRACE: assignment to "trans_scale" in file , line 2141
TRACE: called by 'path_sweep' in file Cane Crook Jig.scad, line 19
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Thank you!
On 12/21/2025 10:12 AM, Adrian Mariano wrote:
No, there is absolutely not a way you could have figured this out from the error messages. I'm pondering the situation.
On Sun, Dec 21, 2025 at 9:49 AM Jon Bondy <jon@jonbondy.commailto:jon@jonbondy.com> wrote:
Adrian:
Thanks for your help!
Is there an easy way that I could have deduced this from the provided error messages?
Jon
On 12/21/2025 9:40 AM, Adrian Mariano via Discuss wrote:
Problem is caused by the duplicate point [10,0,0] in your path.
On Sun, Dec 21, 2025 at 9:28 AM Jon Bondy via Discuss <discuss@lists.openscad.orgmailto:discuss@lists.openscad.org> wrote:
I am sure that the explanation will be obvious once it is explained to me, but the following code produces the following error. The two stroke()s work, so the "path" and "two" should be OK (at least in some sense). I started out with 2-vectors, but added the 3rd zero (for Z) as voodoo programming, trying to honor the mysterious error message.
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
path = [for (theta = [180:5:360])
[10cos(theta), 10sin(theta), 0],
[10, 0, 0], [10, 20, 0]];
stroke(path);
two = [
circle(d = 6),
back(10, right(-3, square(6)))
];
stroke(two);
path_sweep(hull_region(two), path);
ERROR: Assertion 'yvalid' failed: "Input y must be a length 3 vector" in file , line 1323
TRACE: called by 'frame_map' in file , line 2286
TRACE: called by 'path_sweep' in file , line 2141
TRACE: assignment to "trans_scale" in file , line 2141
TRACE: called by 'path_sweep' in file Cane Crook Jig.scad, line 19
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