Empathy List Archives

GB

Glenn Butcher

Sun, Oct 12, 2025 9:36 PM

I'm working on a program that generates stone walls from images. I use
OpenCV to extract the stone contours, which I combine with textures
produced using a libnoise-based command line tool I wrote and the
Manifold mesh library to make the stones. The program saves them as
individual .3mf files.

When I import the stones to do the further work in OpenSCAD (wall
backing, window/door cutout and placement, etc.), the OpenSCAD behavior
is definitely regressive. Here's what it should look like:

Note the script in the editor, it loops through the import command
constructing file names with str(). That goes well enough, but when I
try to do anything else with the stones, like add the color() operator,
I get this:

Most of the stones don't render, with no discernible pattern to which
are lucky. If I try to export this, I get what is seen. Interestingly,
I can run the same script through command-line OpenSCAD and it works fine.

This is with dev version 2025-10-10. I downloaded the 2021 release
version, and it works just fine 'cept for the gawd-awful slow CGAL...

I can open an issue at the repo, thought I'd float it here first.

I'm working on a program that generates stone walls from images. I use OpenCV to extract the stone contours, which I combine with textures produced using a libnoise-based command line tool I wrote and the Manifold mesh library to make the stones. The program saves them as individual .3mf files. When I import the stones to do the further work in OpenSCAD (wall backing, window/door cutout and placement, etc.), the OpenSCAD behavior is definitely regressive. Here's what it should look like: Note the script in the editor, it loops through the import command constructing file names with str(). That goes well enough, but when I try to do anything else with the stones, like add the color() operator, I get this: Most of the stones don't render, with no discernible pattern to which are lucky. If I try to export this, I get what is seen. Interestingly, I can run the same script through command-line OpenSCAD and it works fine. This is with dev version 2025-10-10. I downloaded the 2021 release version, and it works just fine 'cept for the gawd-awful slow CGAL... I can open an issue at the repo, thought I'd float it here first.

MM

Michael Marx (spintel)

Mon, Oct 13, 2025 2:26 AM

Glenn, are you able to share the .3mf files?

At face value it looks like a bug.
I'm happy to have a closer look.

From: Glenn Butcher via Discuss [mailto:discuss@lists.openscad.org]
Sent: Monday, October 13, 2025 8:37 AM
To: 'OpenSCAD general discussion Mailing-list'
Cc: Glenn Butcher
Subject: [OpenSCAD] Import Objects Get No Love

I'm working on a program that generates stone walls from images. I use OpenCV to extract the stone contours, which I combine with textures produced using a libnoise-based command line tool I wrote and the Manifold mesh library to make the stones. The program saves them as individual .3mf files.

When I import the stones to do the further work in OpenSCAD (wall backing, window/door cutout and placement, etc.), the OpenSCAD behavior is definitely regressive. Here's what it should look like:

Note the script in the editor, it loops through the import command constructing file names with str(). That goes well enough, but when I try to do anything else with the stones, like add the color() operator, I get this:

Most of the stones don't render, with no discernible pattern to which are lucky. If I try to export this, I get what is seen. Interestingly, I can run the same script through command-line OpenSCAD and it works fine.

This is with dev version 2025-10-10. I downloaded the 2021 release version, and it works just fine 'cept for the gawd-awful slow CGAL...

I can open an issue at the repo, thought I'd float it here first.

Glenn, are you able to share the .3mf files? At face value it looks like a bug. I'm happy to have a closer look. _____ From: Glenn Butcher via Discuss [mailto:discuss@lists.openscad.org] Sent: Monday, October 13, 2025 8:37 AM To: 'OpenSCAD general discussion Mailing-list' Cc: Glenn Butcher Subject: [OpenSCAD] Import Objects Get No Love I'm working on a program that generates stone walls from images. I use OpenCV to extract the stone contours, which I combine with textures produced using a libnoise-based command line tool I wrote and the Manifold mesh library to make the stones. The program saves them as individual .3mf files. When I import the stones to do the further work in OpenSCAD (wall backing, window/door cutout and placement, etc.), the OpenSCAD behavior is definitely regressive. Here's what it should look like: Note the script in the editor, it loops through the import command constructing file names with str(). That goes well enough, but when I try to do anything else with the stones, like add the color() operator, I get this: Most of the stones don't render, with no discernible pattern to which are lucky. If I try to export this, I get what is seen. Interestingly, I can run the same script through command-line OpenSCAD and it works fine. This is with dev version 2025-10-10. I downloaded the 2021 release version, and it works just fine 'cept for the gawd-awful slow CGAL... I can open an issue at the repo, thought I'd float it here first.

GB

Glenn Butcher

Mon, Oct 13, 2025 2:56 AM

.zip file attached. I also included wall.scad, which has the loop to
import the files. Comment-out the color() line to get nominal behavior.

On 10/12/2025 8:26 PM, Michael Marx (spintel) via Discuss wrote:

Glenn, are you able to share the .3mf files?

At face value it looks like a bug.
I'm happy to have a closer look.

*From:*Glenn Butcher via Discuss [mailto:discuss@lists.openscad.org]
Sent: Monday, October 13, 2025 8:37 AM
To: 'OpenSCAD general discussion Mailing-list'
Cc: Glenn Butcher
Subject: [OpenSCAD] Import Objects Get No Love

I'm working on a program that generates stone walls from images. I
use OpenCV to extract the stone contours, which I combine with
textures produced using a libnoise-based command line tool I wrote and
the Manifold mesh library to make the stones. The program saves them
as individual .3mf files.

When I import the stones to do the further work in OpenSCAD (wall
backing, window/door cutout and placement, etc.), the OpenSCAD
behavior is definitely regressive. Here's what it should look like:

Note the script in the editor, it loops through the import command
constructing file names with str(). That goes well enough, but when I
try to do anything else with the stones, like add the color()
operator, I get this:

Most of the stones don't render, with no discernible pattern to which
are lucky. If I try to export this, I get what is seen. Interestingly,
I can run the same script through command-line OpenSCAD and it works fine.

This is with dev version 2025-10-10. I downloaded the 2021 release
version, and it works just fine 'cept for the gawd-awful slow CGAL...

I can open an issue at the repo, thought I'd float it here first.

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.zip file attached. I also included wall.scad, which has the loop to import the files. Comment-out the color() line to get nominal behavior. On 10/12/2025 8:26 PM, Michael Marx (spintel) via Discuss wrote: > > Glenn, are you able to share the .3mf files? > > At face value it looks like a bug. > I'm happy to have a closer look. > > ------------------------------------------------------------------------ > > *From:*Glenn Butcher via Discuss [mailto:discuss@lists.openscad.org] > *Sent:* Monday, October 13, 2025 8:37 AM > *To:* 'OpenSCAD general discussion Mailing-list' > *Cc:* Glenn Butcher > *Subject:* [OpenSCAD] Import Objects Get No Love > > I'm working on a program that generates stone walls from images. I > use OpenCV to extract the stone contours, which I combine with > textures produced using a libnoise-based command line tool I wrote and > the Manifold mesh library to make the stones. The program saves them > as individual .3mf files. > > When I import the stones to do the further work in OpenSCAD (wall > backing, window/door cutout and placement, etc.), the OpenSCAD > behavior is definitely regressive. Here's what it should look like: > > Note the script in the editor, it loops through the import command > constructing file names with str(). That goes well enough, but when I > try to do anything else with the stones, like add the color() > operator, I get this: > > Most of the stones don't render, with no discernible pattern to which > are lucky. If I try to export this, I get what is seen. Interestingly, > I can run the same script through command-line OpenSCAD and it works fine. > > This is with dev version 2025-10-10. I downloaded the 2021 release > version, and it works just fine 'cept for the gawd-awful slow CGAL... > > I can open an issue at the repo, thought I'd float it here first. > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email todiscuss-leave@lists.openscad.org

GB

Glenn Butcher

Mon, Oct 13, 2025 3:56 AM

I attached a .zip file to a post, but it's too big for the list
criterion. I uploaded it to my personal server, you can get it here:

http://glenn.pulpitrock.net/wall.zip

Moderator, you can ignore the approval.