Chamfered 3D text
George Hartzell wrote:
I think I just connected the dots to a big reason to work with in the
2D space: text is a 2d object and you can't mix it with 3d objects
like cubes....
Speaking of which, I haven't yet found a decent solution to produce engraved
/ embossed text where the 3D effect is chamfered rather than extruded out at
a straight perpendicular.
I can produce a base layer of 2D text, and using "offset" I can produce the
smaller (still 2D) version that sits at the other end of the "extrusion" but
what I can't do is join those two 2D objects to make a solid.
Do I have to resort to interpolating at multiple different vertical
positions and sizes to progressively dig out the text?
That does work, but produces a much higher surface count than simply joining
the two 2D polygons together vertex-by-vertex would.
For 3D printing it's kinda OK, because I can set the interpolation on the Z
axis to match the print resolution, but if I wanted proper smooth polygons
for other purposes it doesn't look great, either.
Ray
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AFAIK, there is no neat way to do it in OpenSCAD. An approximation may be
built with minkowski: it is time-consuming, generates more vertices than
needed and rounds the character corners.
chanfer_text("Text","Liberation Sans:style=Bold", 2, 10);
module chanfer_text(text, font, h, ang) {
d = htan(ang);
minkowski(){
linear_extrude(height=h0.0001)
offset(-d)
text(text, font=font);
linear_extrude(height=h,scale=h*0.0001)
circle(d);
}
}
The offset may be suppressed depending on what you want.
2018-02-06 7:48 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
George Hartzell wrote:
I think I just connected the dots to a big reason to work with in the
2D space: text is a 2d object and you can't mix it with 3d objects
like cubes....
Speaking of which, I haven't yet found a decent solution to produce
engraved
/ embossed text where the 3D effect is chamfered rather than extruded out
at
a straight perpendicular.
I can produce a base layer of 2D text, and using "offset" I can produce the
smaller (still 2D) version that sits at the other end of the "extrusion"
but
what I can't do is join those two 2D objects to make a solid.
Do I have to resort to interpolating at multiple different vertical
positions and sizes to progressively dig out the text?
That does work, but produces a much higher surface count than simply
joining
the two 2D polygons together vertex-by-vertex would.
For 3D printing it's kinda OK, because I can set the interpolation on the Z
axis to match the print resolution, but if I wanted proper smooth polygons
for other purposes it doesn't look great, either.
Ray
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In the Topic "DXF to "3D-printable" lines with thickness", I introduced a
small Python program to convert lines and arcs into function calls. I wrote
modules to generate cylinder and torus pieces, but you can define your own
modules that extrude chamfered sections or created chamfered arcs by
combining cylinders and cones.
I used it to engrave a motto onto a sigil. I drew the motto as text in
LibreCAD, exploded the letters into lines and arcs, and used that as the
input for the Python program.
Mind you, you will still have some work defining the right modules, but at
least it is a possibility.
http://forum.openscad.org/file/t1601/afdruk.png
You can download the program from
http://www.w-p.dds.nl/dxflines2scad_py.txt
(after download, rename it to "dxflines2scad.py")
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This is what I came up with. I didn't try printing with it yet, but I think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
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This is a standard solution. Unhappily, besides the staircase surface, it
is more time-consuming than using minkowski because of the union of many
objects. It doesn't round corners, though.
2018-02-06 11:35 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
This is what I came up with. I didn't try printing with it yet, but I
think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
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Varying the second object in Ronaldo's code changes the effect... e.g. the
following chamfers at 45 degrees (I think) in the X direction.
chamfer_text("Text","Liberation Sans:style=Bold", 3, 10);
module chamfer_text(text, font, h, ang) {
d = htan(ang);
minkowski(){
linear_extrude(height=h0.0001)
offset(-d)
text(text, font=font);
rotate([90,0,0])
linear_extrude(d) polygon(points=[[-d,0], [d,0],[0,d]]);
}
}
On Wed, Feb 7, 2018 at 3:59 AM, Ronaldo Persiano rcmpersiano@gmail.com
wrote:
This is a standard solution. Unhappily, besides the staircase surface, it
is more time-consuming than using minkowski because of the union of many
objects. It doesn't round corners, though.
2018-02-06 11:35 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
This is what I came up with. I didn't try printing with it yet, but I
think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
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Nice; to have the specified height and angle the polygon should be:
polygon(points=[[-d,0], [d,0],[0,h]])
2018-02-06 16:11 GMT-02:00 Frank van der Hulst drifter.frank@gmail.com:
Varying the second object in Ronaldo's code changes the effect... e.g. the
following chamfers at 45 degrees (I think) in the X direction.
chamfer_text("Text","Liberation Sans:style=Bold", 3, 10);
module chamfer_text(text, font, h, ang) {
d = htan(ang);
minkowski(){
linear_extrude(height=h0.0001)
offset(-d)
text(text, font=font);
rotate([90,0,0])
linear_extrude(d) polygon(points=[[-d,0], [d,0],[0,d]]);
}
}
On Wed, Feb 7, 2018 at 3:59 AM, Ronaldo Persiano rcmpersiano@gmail.com
wrote:
This is a standard solution. Unhappily, besides the staircase surface, it
is more time-consuming than using minkowski because of the union of many
objects. It doesn't round corners, though.
2018-02-06 11:35 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
This is what I came up with. I didn't try printing with it yet, but I
think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
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Here’s my solution to the same problem, using Minkowski…
//(c)2018-01-06 Alex Gibson: admg chamfered text module
//Licence: Creative Commons [CC BY-SA 4.0] https://creativecommons.org/licenses/by-sa/4.0/
module admg_chamfered_text(some_text_here,text_height,text_depth,chamfer_depth,chamfer_width)
{
translate([0,0,text_depth-chamfer_depth])
difference()
{
translate([0,0,-(text_depth-chamfer_depth)])
linear_extrude(text_depth)
text(some_text_here,text_height,valign="center",halign="center");
minkowski()
{
difference()
{
cube([500,500,text_depth],center=true);
translate([0,0,-text_depth])
linear_extrude(text_depth*2)
text(some_text_here,text_depth*2,valign="center",halign="center");
}
translate([0,0,text_depth/2])
cylinder(chamfer_depth,0,chamfer_width);
}
}
}
admg_chamfered_text("hello, world!",20,10,0.5,0.5);
Alex Gibson
+44 7813 810 765 @alexgibson3d 37 Royal Avenue, Reading RG31 4UR
admg consulting
edumaker limited
· Project management
· Operations & Process improvement
· 3D Printing
From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of Ronaldo Persiano
Sent: 06 February 2018 20:20
To: OpenSCAD general discussion
Subject: Re: [OpenSCAD] Chamfered 3D text
Nice; to have the specified height and angle the polygon should be:
polygon(points=[[-d,0], [d,0],[0,h]])
2018-02-06 16:11 GMT-02:00 Frank van der Hulst drifter.frank@gmail.com:
Varying the second object in Ronaldo's code changes the effect... e.g. the following chamfers at 45 degrees (I think) in the X direction.
chamfer_text("Text","Liberation Sans:style=Bold", 3, 10);
module chamfer_text(text, font, h, ang) {
d = htan(ang);
minkowski(){
linear_extrude(height=h0.0001)
offset(-d)
text(text, font=font);
rotate([90,0,0])
linear_extrude(d) polygon(points=[[-d,0], [d,0],[0,d]]);
}
}
On Wed, Feb 7, 2018 at 3:59 AM, Ronaldo Persiano rcmpersiano@gmail.com wrote:
This is a standard solution. Unhappily, besides the staircase surface, it is more time-consuming than using minkowski because of the union of many objects. It doesn't round corners, though.
2018-02-06 11:35 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
This is what I came up with. I didn't try printing with it yet, but I think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
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This brings up a point I've been meaning to address. The linear extrude
function has a "scale" parameter that can scale one end of the extrusion.
It seems like a logical and useful addition to this would be an "offset"
parameter, that would do the same thing, but offset the other end instead
of scaling. It would solve this problem and many others.
Of course, it might take some consideration, obviously, to ensure that it
correctly handles areas that become zero-thickness (or negative-thickness)
when a negative value for offset it used, as well as ensuring that the
resulting object remains manifold when areas merge or holes close up. This
makes it more complicated to implement than the existing scale parameter,
but I think it would be a worthwhile addition.
On February 6, 2018 at 15:13:47, Alex Gibson (alex@alexgibson.net) wrote:
Here’s my solution to the same problem, using Minkowski…
//(c)2018-01-06 Alex Gibson: admg chamfered text module
//Licence: Creative Commons [CC BY-SA 4.0]
https://creativecommons.org/licenses/by-sa/4.0/
module
admg_chamfered_text(some_text_here,text_height,text_depth,chamfer_depth,chamfer_width)
{
translate([0,0,text_depth-chamfer_depth])
difference()
{
translate([0,0,-(text_depth-chamfer_depth)])
linear_extrude(text_depth)
text(some_text_here,text_height,valign="center",halign="center");
minkowski()
{
difference()
{
cube([500,500,text_depth],center=true);
translate([0,0,-text_depth])
linear_extrude(text_depth*2)
text(some_text_here,text_depth*2,valign="center",halign="center");
}
translate([0,0,text_depth/2])
cylinder(chamfer_depth,0,chamfer_width);
}
}
}
admg_chamfered_text("hello, world!",20,10,0.5,0.5);
Alex Gibson
+44 7813 810 765 @alexgibson3d 37 Royal Avenue, Reading RG31 4UR
admg consulting
edumaker limited
· Project management
· Operations & Process improvement
· 3D Printing
From: Discuss [mailto:discuss-bounces@lists.openscad.org] *On Behalf
Of *Ronaldo
Persiano
Sent: 06 February 2018 20:20
To: OpenSCAD general discussion
Subject: Re: [OpenSCAD] Chamfered 3D text
Nice; to have the specified height and angle the polygon should be:
polygon(points=[[-d,0], [d,0],[0,h]])
2018-02-06 16:11 GMT-02:00 Frank van der Hulst drifter.frank@gmail.com:
Varying the second object in Ronaldo's code changes the effect... e.g. the
following chamfers at 45 degrees (I think) in the X direction.
chamfer_text("Text","Liberation Sans:style=Bold", 3, 10);
module chamfer_text(text, font, h, ang) {
d = htan(ang);
minkowski(){
linear_extrude(height=h0.0001)
offset(-d)
text(text, font=font);
rotate([90,0,0])
linear_extrude(d) polygon(points=[[-d,0], [d,0],[0,d]]);
}
}
On Wed, Feb 7, 2018 at 3:59 AM, Ronaldo Persiano rcmpersiano@gmail.com
wrote:
This is a standard solution. Unhappily, besides the staircase surface, it
is more time-consuming than using minkowski because of the union of many
objects. It doesn't round corners, though.
2018-02-06 11:35 GMT-02:00 RayBellis openscad@ray.bellis.me.uk:
This is what I came up with. I didn't try printing with it yet, but I
think
it would work:
module Embossed(step = 0.05, height = 1, grad = 0.5) {
for (z = [ 0 : step : height ]) {
translate([0, 0, z])
linear_extrude(height = step)
offset(delta = -z * grad, chamfer = true)
children();
}
};
--
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@Gibson
I guess your second text call should have the same parameters as the first
one: text_height instead of text_depth*2.
Anyway, I think you will get the same result with a simpler code:
module
admg_chamfered_text1(some_text_here,text_height,text_depth,chamfer_depth,chamfer_width){
minkowski() {
linear_extrude(text_depth*2)
text(some_text_here,text_height,valign="center",halign="center");
cylinder(chamfer_depth,r1=chamfer_width,r2=0);
}
}
2018-02-06 21:12 GMT-02:00 Alex Gibson alex@alexgibson.net:
Here’s my solution to the same problem, using Minkowski…