On Sunday, 1 May 2022 09:32:23 EDT gene heskett wrote:

I turned off the automatic reload and preview, shut it down and restarted
OpenSCAD, loaded the file, and it rendered the tooth form but still
refuses to do the whole thing.

I see a features screen has been added to edit>prefs, and nothing is
checked, what s/b?

Thanks all.

Cheers, Gene Heskett.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

I can not speak to the root cause - I am a bit of rookie myself - but it fails on all of my app images including one from Oct 21 - so I would suspect the code not the app.

To test this I built a quick model of your thread using a spiral extrude library https://www.thingiverse.com/thing:1958354 https://www.thingiverse.com/thing:1958354

union(){
translate([0,0,0])spiral_extrude(Radius=19, EndRadius=19, Pitch=12, Height=54.25, StepsPerRev=50, Starts=1){rotate([0,0,0])threadshape();}
cylinder(54.25,19,19);
}

module threadshape(){
polygon(points=[[0,0],[1,0],[5,4],[1,6],[5,10],[1,12],[1,12]]);
}

And that works in a matter of seconds.

cheers
Bob

On Sun, 01 May 2022 09:44:46 -0400
gene heskett gheskett@shentel.net wrote:

Hello Gene,

I've just loaded your source with openscad-nightly [1] without any
problem in preview (F5). Settings - Functions are all set ON.
Loaded design
'/home/peter/.claws-mail/mimetmp/00000123.buttress_vise_bolt_nut.scad'.
Compiling design (CSG Tree generation)...
ECHO: 16, 50.8, 44.8, 4, 3, 0.5
Compiling design (CSG Products generation)...
Geometries in cache: 6
Geometry cache size in bytes: 8832
CGAL Polyhedrons in cache: 0
CGAL cache size in bytes: 0
Compiling design (CSG Products normalization)...
Normalized tree has 13820 elements!
Compile and preview finished.
Total rendering time: 0:00:00.567

For Render (F6) the output shows
Parsing design (AST generation)...
Compiling design (CSG Tree generation)...
ECHO: 16, 50.8, 44.8, 4, 3, 0.5
Rendering Polygon Mesh using CGAL...
Geometries in cache: 14
Geometry cache size in bytes: 116896
CGAL Polyhedrons in cache: 3816
CGAL cache size in bytes: 104833152
Total rendering time: 0:18:18.500
Top level object is a 3D object:
Simple:        yes
Vertices:  130212
Halfedges:  390636
Edges:      195318
Halffacets: 130212
Facets:      65106
Volumes:        2
Rendering finished.

On the outside there can be seen something like saw tooth! This may
grow up the render time and may not be wanted, I guess.

I've no hint how to solve.
Greetings
Peter

[1] OpenSCAD Version: 2022.04.21
System information: Linux 5.15.32-1-MANJARO #1 SMP PREEMPT Mon Mar 28 09:16:36 UTC 2022 x86_64 Ubuntu Core 20 4 CPUs 31.26 GB RAM
User Agent: OpenSCAD/2022.04.21 (Linux x86_64; Ubuntu Core 20)
Settings - Functions are all set ON.

On Sunday, 1 May 2022 09:44:46 EDT gene heskett wrote:

I checked the top option, use fast-cgi, and it rendered the bolt in
around 16.5 minutes, but rendering the nut uses a different size of the
bolt for a difference. So it has to rerender the bolt at it's newer size
fot the difference. The bolt is eventually turned into g-code to carve a
hard maple screw. You'd be amazed at the miss-match in mm per thread that
can generate with a .01% change in the pitch. I'm now fine tuning the 4th
digit to the right, and not there yet in maple. The diff in OD is just
over the printers nozzle size.  Fun and games, showing me just how big a
piece of excrement a 6040 mill really is. But anything better costs
several thousand USD more.

The bolt had some errors which I tweaked out but the nut fails to render
a preview and has been working on it for around 15 minutes w/o even
clearing the bolt image from the preview screen.

Cheers, Gene Heskett.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

On Sunday, 1 May 2022 11:39:26 EDT Bob Carter wrote:

So would I... I did get it to preview the nut once, full of errors in
rendering.

My starts=2. Pitch=12, so the tooth is supposedly 6mm at 2 start but came
out 11.0925xxxx ack my calipers. I think my code is guilty. And it
finally failed after about 30 minutes.

That code rendered, and printed well, in late February.

I will give it a try.  Thank you Bob.
I simplified the tooth to 1 a total of 6mm in x. Then tried to install
that library, restarted OpenSCAD, changed it to 2 starts, and its been
munching along for several minutes. One thing I note is that the
toothshape output will need heavily rotated which I see is in the code
but at 0,0,0, fill in the blanks IOW.
Its still munching along and I have other mails to answer.

Thanks Bob, I'll learn something about polygons maybe.

Cheers, Gene Heskett.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

On Sunday, 1 May 2022 18:02:27 EDT gene heskett wrote:

Gah! exporting the view screen as a png is empty?

Reading thru the docs, it appears I need a polyhedron instead of a
polygon, its in the 3d list. And example 3, with one more added flat top
face, looks like it might be what I need. If so, I'll hack away at that.
It looks a bit like one of those numbered excedrin headaches.

What I want, is the above polygon, but as a polyhedra 1mm Z thick. from
-.5 to +.5. I can rotate it as required. It will need to be off plumb
vertically in order to be a flat surface on the faces of the thread. The
older code put it off vertical about 5 degrees.

Cheers, Gene Heskett.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

Use linear_extrude() on the 2d shape