converting 2d paths to simple 3d shapes within BOSL2
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points to
an offset, reversing the duplication into a new path, and concat()ing the
two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing for
any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible, and
I'm looking for guidance. Is there a better way to take a simple, convex
path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
Maybe stroke or path_sweep will do what you want working directly on the
path. You might need to use path3d to promote a 2d path to 3d.
On Mon, Jul 24, 2023, 10:29 Jonathan Gilbert jong@jong.org wrote:
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points to
an offset, reversing the duplication into a new path, and concat()ing the
two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing
for any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible, and
I'm looking for guidance. Is there a better way to take a simple, convex
path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Here is some code that uses stroke(arc()) that may be helpful -- used for
the slotting on the bottom of the utensil dryer. stroke() comes from the
BOSL2 library.
https://www.printables.com/model/527730-utensil-drying-rack-openscad-parametric/files
Dan
On Mon, Jul 24, 2023 at 6:35 PM Adrian Mariano avm4@cornell.edu wrote:
Maybe stroke or path_sweep will do what you want working directly on the
path. You might need to use path3d to promote a 2d path to 3d.
On Mon, Jul 24, 2023, 10:29 Jonathan Gilbert jong@jong.org wrote:
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points
to an offset, reversing the duplication into a new path, and concat()ing
the two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing
for any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible, and
I'm looking for guidance. Is there a better way to take a simple, convex
path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
soooort of, but not really: path_sweep() gets me a shape passed along the
path, which I use elsewhere and is quite nifty, but in this case I'm
looking to take a path and convert it to a polygon which has a width, which
I then extrude into a height.
path -> path_sweep() (with a shape of the desired height, say a circle())
gets me a tubular shape that follows the path. It works so long as the
height and the width of the final shape is the same, but not so much if I
want a shape that is much taller than it is thick.
path -> stroke() (with a width) -> linear_extrude() (to the desired height) kind of gets me where I want to be, but there's no attachment
points (which I need) or VNF (which I don't need today but would probably
like to have in the future).
path -> [something] -> linear_sweep() (to the desired height) would give
me fully what I'm looking for.
I guess the question rephrased is: given a path and a "width" or
"thickness", how do I create a 2d polygon that follows that path, suitable
for extruding with linear_sweep()?
On Mon, Jul 24, 2023 at 10:35 AM Adrian Mariano avm4@cornell.edu wrote:
Maybe stroke or path_sweep will do what you want working directly on the
path. You might need to use path3d to promote a 2d path to 3d.
On Mon, Jul 24, 2023, 10:29 Jonathan Gilbert jong@jong.org wrote:
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points
to an offset, reversing the duplication into a new path, and concat()ing
the two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing
for any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible, and
I'm looking for guidance. Is there a better way to take a simple, convex
path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
Use path sweep with a rectangle that is the desired much larger height.
That should be equivalent to your original construction.
On Mon, Jul 24, 2023, 14:16 Jonathan Gilbert jong@jong.org wrote:
soooort of, but not really: path_sweep() gets me a shape passed along the
path, which I use elsewhere and is quite nifty, but in this case I'm
looking to take a path and convert it to a polygon which has a width, which
I then extrude into a height.
path -> path_sweep() (with a shape of the desired height, say a circle()) gets me a tubular shape that follows the path. It works so long
as the height and the width of the final shape is the same, but not so much
if I want a shape that is much taller than it is thick.
path -> stroke() (with a width) -> linear_extrude() (to the desired height) kind of gets me where I want to be, but there's no attachment
points (which I need) or VNF (which I don't need today but would probably
like to have in the future).
path -> [something] -> linear_sweep() (to the desired height) would
give me fully what I'm looking for.
I guess the question rephrased is: given a path and a "width" or
"thickness", how do I create a 2d polygon that follows that path, suitable
for extruding with linear_sweep()?
On Mon, Jul 24, 2023 at 10:35 AM Adrian Mariano avm4@cornell.edu wrote:
Maybe stroke or path_sweep will do what you want working directly on the
path. You might need to use path3d to promote a 2d path to 3d.
On Mon, Jul 24, 2023, 10:29 Jonathan Gilbert jong@jong.org wrote:
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points
to an offset, reversing the duplication into a new path, and concat()ing
the two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing
for any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible,
and I'm looking for guidance. Is there a better way to take a simple,
convex path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
AH! Yes. See, that is exactly the sort of answer I was looking for: meets
my needs, easy to implement, and makes me feel a little foolish for not
thinking of it before. :D Thank you!
On Mon, Jul 24, 2023 at 12:50 PM Adrian Mariano avm4@cornell.edu wrote:
Use path sweep with a rectangle that is the desired much larger height.
That should be equivalent to your original construction.
On Mon, Jul 24, 2023, 14:16 Jonathan Gilbert jong@jong.org wrote:
soooort of, but not really: path_sweep() gets me a shape passed along the
path, which I use elsewhere and is quite nifty, but in this case I'm
looking to take a path and convert it to a polygon which has a width, which
I then extrude into a height.
path -> path_sweep() (with a shape of the desired height, say a circle()) gets me a tubular shape that follows the path. It works so long
as the height and the width of the final shape is the same, but not so much
if I want a shape that is much taller than it is thick.
path -> stroke() (with a width) -> linear_extrude() (to the desired height) kind of gets me where I want to be, but there's no attachment
points (which I need) or VNF (which I don't need today but would probably
like to have in the future).
path -> [something] -> linear_sweep() (to the desired height) would
give me fully what I'm looking for.
I guess the question rephrased is: given a path and a "width" or
"thickness", how do I create a 2d polygon that follows that path, suitable
for extruding with linear_sweep()?
On Mon, Jul 24, 2023 at 10:35 AM Adrian Mariano avm4@cornell.edu wrote:
Maybe stroke or path_sweep will do what you want working directly on the
path. You might need to use path3d to promote a 2d path to 3d.
On Mon, Jul 24, 2023, 10:29 Jonathan Gilbert jong@jong.org wrote:
Is there a general procedure to convert a 2D path into a 3D shape?
I'm currently taking the path produced by arc(), duplicating the points
to an offset, reversing the duplication into a new path, and concat()ing
the two paths into a single 2D shape, and using that to extrude or sweep or
whatnot.
include <BOSL2/std.scad>
module _arc_arm(d, h=1, w=0) {
width = (w==0) ? d * 0.05 : w;
c1 = arc(36, d=d, angle=90);
c2 = reverse(
arc(36, d=d, angle=90,
cp=apply(move([-width/2, -width/2]), [0, 0])
));
c = concat(c1, c2);
attachable(CENTER, 0, UP, d=d, h=h) {
down(h/2)
linear_sweep(c, h=h);
children();
}
}
_arc_arm(30, 2);
I'm using arc() in this example, but this is essentially what I'm doing
for any arbitrary 2D path that I need to convert into a simple shape with a
height dimension.
I'm not sure I'm doing this the most easiest or efficiently possible,
and I'm looking for guidance. Is there a better way to take a simple,
convex path and convert it to a 2D shape somewhere within BOSL2 somewhere?
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
--
- Jon Gilbert
jong@jong.org / jgilbertsjc@gmail.com