Empathy List Archives

J

jon

Mon, Nov 9, 2015 3:49 PM

I've been "engraving" a logo on a surface by differencing some text that
I created using write().

The customer now supplied a logo file (attached as a PNG). I can get
the thing to appear using

         scale([0.1, 0.1, 0.1])
            surface(file =

"d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true);

The problem is that once that is done, OpenSCAD becomes essentially
unresponsive. F5 and F6 take forever, and the visible model when using
F5 is very slow. I tried using render() but that did not help either.

I tried computing an STL separately and then using import(), but that is
equally slow (the STL is 150KB).

Any idea how to "emboss" an arbitrary PNG onto a surface without making
OpenSCAD unusable?

Jon

I've been "engraving" a logo on a surface by differencing some text that I created using write(). The customer now supplied a logo file (attached as a PNG). I can get the thing to appear using scale([0.1, 0.1, 0.1]) surface(file = "d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true); The problem is that once that is done, OpenSCAD becomes essentially unresponsive. F5 and F6 take forever, and the visible model when using F5 is very slow. I tried using render() but that did not help either. I tried computing an STL separately and then using import(), but that is equally slow (the STL is 150KB). Any idea how to "emboss" an arbitrary PNG onto a surface without making OpenSCAD unusable? Jon

MK

Marius Kintel

Mon, Nov 9, 2015 4:47 PM

For this particular design, get a vector file rather than a bitmap, or remake the design using OpenSCAD primitives.
surface() is going to destroy responsiveness as it has to generate massive amounts of polygons.

-Marius

On Nov 9, 2015, at 10:49 AM, jon jon@jonbondy.com wrote:

I've been "engraving" a logo on a surface by differencing some text that I created using write().

The customer now supplied a logo file (attached as a PNG). I can get the thing to appear using

        scale([0.1, 0.1, 0.1])
           surface(file = "d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true);

The problem is that once that is done, OpenSCAD becomes essentially unresponsive. F5 and F6 take forever, and the visible model when using F5 is very slow. I tried using render() but that did not help either.

I tried computing an STL separately and then using import(), but that is equally slow (the STL is 150KB).

Any idea how to "emboss" an arbitrary PNG onto a surface without making OpenSCAD unusable?

Jon
<Logo_AnywhereTideClock_Inverted.PNG>_______________________________________________
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

For this particular design, get a vector file rather than a bitmap, or remake the design using OpenSCAD primitives. surface() is going to destroy responsiveness as it has to generate massive amounts of polygons. -Marius > On Nov 9, 2015, at 10:49 AM, jon <jon@jonbondy.com> wrote: > > I've been "engraving" a logo on a surface by differencing some text that I created using write(). > > The customer now supplied a logo file (attached as a PNG). I can get the thing to appear using > > scale([0.1, 0.1, 0.1]) > surface(file = "d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true); > > The problem is that once that is done, OpenSCAD becomes essentially unresponsive. F5 and F6 take forever, and the visible model when using F5 is very slow. I tried using render() but that did not help either. > > I tried computing an STL separately and then using import(), but that is equally slow (the STL is 150KB). > > Any idea how to "emboss" an arbitrary PNG onto a surface without making OpenSCAD unusable? > > Jon > <Logo_AnywhereTideClock_Inverted.PNG>_______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

EN

Ed Nisley

Mon, Nov 9, 2015 5:58 PM

On 11/09/2015 10:49 AM, jon wrote:

how to "emboss" an arbitrary PNG

Use a much smaller image with the worst resolution = fewest pixels you
can possibly stand.

A year or two ago, OpenSCAD could handle an image up to about 300x300
pixels. That may have changed one way or the other, but it'll give you
an idea of how small "fewest" must be.

Here's the checklist I used to create PNG images for cookie cutter outlines:

http://softsolder.com/2012/11/29/automated-cookie-cutters-image-preparation-checklist/

And for chocolate molds:

http://softsolder.com/2014/02/14/chocolate-mold-image-preparation-checklist/

When you need more dots, surface() is not your friend...

--
Ed
softsolder.com

On 11/09/2015 10:49 AM, jon wrote: > how to "emboss" an arbitrary PNG Use a much smaller image with the worst resolution = fewest pixels you can possibly stand. A year or two ago, OpenSCAD could handle an image up to about 300x300 pixels. That may have changed one way or the other, but it'll give you an idea of how small "fewest" must be. Here's the checklist I used to create PNG images for cookie cutter outlines: http://softsolder.com/2012/11/29/automated-cookie-cutters-image-preparation-checklist/ And for chocolate molds: http://softsolder.com/2014/02/14/chocolate-mold-image-preparation-checklist/ When you need more dots, surface() is not your friend... -- Ed softsolder.com

BP

Brad Pitcher

Mon, Nov 9, 2015 6:05 PM

Trace the bitmap to a path in Inkscape and export it the path to .dxf[0]
or even.scad[1] using an Inkscape plugin

[0] http://www.thingiverse.com/thing:14221
[1] http://www.thingiverse.com/thing:25036

On Mon, Nov 9, 2015 at 9:59 AM Ed Nisley ed.nisley@pobox.com wrote:

On 11/09/2015 10:49 AM, jon wrote:

how to "emboss" an arbitrary PNG

Use a much smaller image with the worst resolution = fewest pixels you
can possibly stand.

A year or two ago, OpenSCAD could handle an image up to about 300x300
pixels. That may have changed one way or the other, but it'll give you
an idea of how small "fewest" must be.

Here's the checklist I used to create PNG images for cookie cutter
outlines:

http://softsolder.com/2012/11/29/automated-cookie-cutters-image-preparation-checklist/

And for chocolate molds:

http://softsolder.com/2014/02/14/chocolate-mold-image-preparation-checklist/

When you need more dots, surface() is not your friend...

--
Ed
softsolder.com

OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Trace the bitmap to a path in Inkscape and export it the path to *.dxf[0] or even*.scad[1] using an Inkscape plugin [0] http://www.thingiverse.com/thing:14221 [1] http://www.thingiverse.com/thing:25036 On Mon, Nov 9, 2015 at 9:59 AM Ed Nisley <ed.nisley@pobox.com> wrote: > On 11/09/2015 10:49 AM, jon wrote: > > how to "emboss" an arbitrary PNG > > Use a much smaller image with the worst resolution = fewest pixels you > can possibly stand. > > A year or two ago, OpenSCAD could handle an image up to about 300x300 > pixels. That may have changed one way or the other, but it'll give you > an idea of how small "fewest" must be. > > Here's the checklist I used to create PNG images for cookie cutter > outlines: > > > http://softsolder.com/2012/11/29/automated-cookie-cutters-image-preparation-checklist/ > > And for chocolate molds: > > > http://softsolder.com/2014/02/14/chocolate-mold-image-preparation-checklist/ > > When you need more dots, surface() is not your friend... > > -- > Ed > softsolder.com > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

N

Neon22

Mon, Nov 9, 2015 9:02 PM

I also advise inkscape and the "Trace bitmap" command and then export using
the openscad export script.
But I made a v7 which works better if you're going to use the polygon shape
in a dedicated piece of code.
It puts the polygon into a avriable of points and paths if required.
Here:

http://www.thingiverse.com/thing:1065500

But then you may have to use png for some reason. In which case make it as
small as possible.

--
View this message in context: http://forum.openscad.org/using-a-PNG-logo-tp14319p14325.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

I also advise inkscape and the "Trace bitmap" command and then export using the openscad export script. But I made a v7 which works better if you're going to use the polygon shape in a dedicated piece of code. It puts the polygon into a avriable of points and paths if required. Here: - http://www.thingiverse.com/thing:1065500 But then you may have to use png for some reason. In which case make it as small as possible. -- View this message in context: http://forum.openscad.org/using-a-PNG-logo-tp14319p14325.html Sent from the OpenSCAD mailing list archive at Nabble.com.

MK

Marius Kintel

Mon, Nov 9, 2015 9:18 PM

Btw.,

For the adventurous, there is an experimental bitmap tracer in a separate OpenSCAD branch:
https://github.com/openscad/openscad/pull/1110
https://github.com/openscad/openscad/tree/potrace

-Marius

Btw., For the adventurous, there is an experimental bitmap tracer in a separate OpenSCAD branch: https://github.com/openscad/openscad/pull/1110 https://github.com/openscad/openscad/tree/potrace -Marius

CC

CHIN, Chien Ting 钱建庭

Tue, Nov 10, 2015 3:32 AM

Yeah I think the number of pixels is killing OpenSCAD due to the
unnecessarily large number of polygons. This particular design is
simple enough that it OUGHT to be generated with some vector-based
format. By .DXF as someone suggested or re-design it from OpenSCAD coding.

I've made 512x512 bitmap embossing on OpenSCAD with satisfactory result
(pre-2015-03).

On 11/9/2015 11:49 PM, jon wrote:

I've been "engraving" a logo on a surface by differencing some text
that I created using write().

The customer now supplied a logo file (attached as a PNG). I can get
the thing to appear using

         scale([0.1, 0.1, 0.1])
            surface(file =

"d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true);

The problem is that once that is done, OpenSCAD becomes essentially
unresponsive. F5 and F6 take forever, and the visible model when
using F5 is very slow. I tried using render() but that did not help
either.

I tried computing an STL separately and then using import(), but that
is equally slow (the STL is 150KB).

Any idea how to "emboss" an arbitrary PNG onto a surface without
making OpenSCAD unusable?

Jon

OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

--
錢建庭教授、教研办副主任
深圳大学生物医学工程系

CHIN, Chien Ting, Professor, Vice Chairman (Education)
Department of Biomedical Engineering
Shenzhen University
Tel: +86-755-8667-1915

Yeah I think the number of pixels is killing OpenSCAD due to the unnecessarily large number of polygons. This particular design is simple enough that it OUGHT to be generated with some vector-based format. By .DXF as someone suggested or re-design it from OpenSCAD coding. I've made 512x512 bitmap embossing on OpenSCAD with satisfactory result (pre-2015-03). On 11/9/2015 11:49 PM, jon wrote: > I've been "engraving" a logo on a surface by differencing some text > that I created using write(). > > The customer now supplied a logo file (attached as a PNG). I can get > the thing to appear using > > scale([0.1, 0.1, 0.1]) > surface(file = > "d:/jon/Logo_AnywhereTideClock_Inverted.png", center = true); > > The problem is that once that is done, OpenSCAD becomes essentially > unresponsive. F5 and F6 take forever, and the visible model when > using F5 is very slow. I tried using render() but that did not help > either. > > I tried computing an STL separately and then using import(), but that > is equally slow (the STL is 150KB). > > Any idea how to "emboss" an arbitrary PNG onto a surface without > making OpenSCAD unusable? > > Jon > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org -- 錢建庭教授、教研办副主任深圳大学生物医学工程系 CHIN, Chien Ting, Professor, Vice Chairman (Education) Department of Biomedical Engineering Shenzhen University Tel: +86-755-8667-1915

C

clothbot

Tue, Nov 10, 2015 2:19 PM

Hey Marius,

Some smarts could be added to this section of surface.cc:

https://github.com/openscad/openscad/blob/master/src/surface.cc#L236-L260

...to only create two poly's (not four with vx average midpoint) in the
following three cases:

v1==v3
v2==v4
v1==v2 && v3==v4

This could reduce the mesh size significantly in monochrome and same-colour
regions, and it should also take care of many artificial "saw tooth
diagonals" around the perimeter of same-colour regions.

Thoughts?

Andrew.

--
View this message in context: http://forum.openscad.org/using-a-PNG-logo-tp14319p14342.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

Hey Marius, Some smarts could be added to this section of surface.cc: https://github.com/openscad/openscad/blob/master/src/surface.cc#L236-L260 ...to only create two poly's (not four with vx average midpoint) in the following three cases: v1==v3 v2==v4 v1==v2 && v3==v4 This could reduce the mesh size significantly in monochrome and same-colour regions, and it should also take care of many artificial "saw tooth diagonals" around the perimeter of same-colour regions. Thoughts? Andrew. -- View this message in context: http://forum.openscad.org/using-a-PNG-logo-tp14319p14342.html Sent from the OpenSCAD mailing list archive at Nabble.com.

discuss@lists.openscad.org

using a PNG logo