fwd(3) square(\[len,3\]) ;

for (idx=\[0:1:Length\]) {

  xcopies(spot\[idx\], l=len, sp=sp) mark(tic\[idx\]) ;

}

xcopies(mk4,l=len-4, sp=\[0,-6,0\]) square(3) ;

for (idx=\[0:1:Length\]) {

   translate(\[idx\*mk1-1,14,0\]) text(str(Length-idx), size=5 ) ;

}

Please excuse a possibly/probably dumb question from a newbe. I recently designed a 2D ruler for export to a CNC Router and & a Laser Engraver. Worked well. I then decided to emboss the pattern into a surface but get the following on render: > *Parsing design (AST generation)...* > *Compiling design (CSG Tree generation)...* > > *Rendering Polygon Mesh using Manifold...* > > *WARNING: PolySet -> Manifold conversion failed: NotManifold* > > *Trying to repair and reconstruct mesh..* > > *Rendering cancelled on first warning.* > > *WARNING: No top level geometry to render* How does one go about locating the cause of such? The code follows: // Ruler-printable include <BOSL2/std.scad> Length = 4 ; //Overall length in Inches Thick = 3 ; len = Length\*INCH ; mk1 = 1.0\*INCH ; mk2 = mk1/2 ; mk4 = mk1/4 ; mk8 = mk1/8 ; mk16 = mk1/16 ; mk_width = 0.5 ; t1 = mk1/2 ; // length of tic marks t2 = t1/2 ; t4 = t1/3 ; t8 = t1/4 ; t16 = t1/5 ; spot = \[mk1,mk2,mk4,mk8,mk16\] ; tic = \[t1,t2,t4,t8,t16\] ; module mark(x) { square(\[mk_width, x\]) ; } sp = \[0,0,0\] ; difference() { translate(\[-mk2/2,-6,-(Thick-1+0.01)\]) cube(\[len+mk2,mk1,Thick\]) ; linear_extrude(height=1) union() { fwd(3) square(\[len,3\]) ; for (idx=\[0:1:Length\]) { xcopies(spot\[idx\], l=len, sp=sp) mark(tic\[idx\]) ; } xcopies(mk4,l=len-4, sp=\[0,-6,0\]) square(3) ; for (idx=\[0:1:Length\]) { translate(\[idx\*mk1-1,14,0\]) text(str(Length-idx), size=5 ) ; } } } Preview gives no errors and shows: 

> On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss <discuss@lists.openscad.org> wrote: > > WARNING: PolySet -> Manifold conversion failed: NotManifold > > Trying to repair and reconstruct mesh.. > > Rendering cancelled on first warning. > > WARNING: No top level geometry to render > > How does one go about locating the cause of such? The code follows: > For now: 1. Turn off Preferences ->Advanced->OpenSCAD Language Features->Stop on first warning 2. Follow https://github.com/openscad/openscad/issues/5135 -Marius

    for (idx=[0:1:Length]) {
        translate([idx*mk1-1,14,0]) text(str(Length-idx), size=5 ) ;
    }
}

I noticed a couple of Z-fighting-related preview artifacts related to the larger tic marks at the front of the ruler.  (There was straightforward Z-fighting at the very front, and a strange artifact along their back end, where they meet the large recessed block.)  There was also usual convexity issues associated with extruding a concave shape. I fixed that by pulling them -Y by 1 and lengthening them by 2 to avoid any coincident faces, and set convexity to 5, and that seems to have fixed both the preview and the render.  My changes marked with //HERE... // Ruler-printable include <BOSL2/std.scad> Length = 4 ; //Overall length in Inches Thick = 3 ; len = Length*INCH ; mk1 = 1.0*INCH ; mk2 = mk1/2 ; mk4 = mk1/4 ; mk8 = mk1/8 ; mk16 = mk1/16 ; mk_width = 0.5 ; t1 = mk1/2 ; // length of tic marks t2 = t1/2 ; t4 = t1/3 ; t8 = t1/4 ; t16 = t1/5 ; spot = [mk1,mk2,mk4,mk8,mk16] ; tic = [t1,t2,t4,t8,t16] ; module mark(x) { square([mk_width, x]) ; } sp = [0,0,0] ; difference() { translate([-mk2/2,-6,-(Thick-1+0.01)]) cube([len+mk2,mk1,Thick]) ; linear_extrude(height=1, convexity=5) union() { // HERE fwd(3) square([len,3]) ; for (idx=[0:1:Length]) { xcopies(spot[idx], l=len, sp=sp) mark(tic[idx]) ; } xcopies(mk4,l=len-4, sp=[0,-6,0]) fwd(1) square([3,1+3+1]) ; // HERE for (idx=[0:1:Length]) { translate([idx*mk1-1,14,0]) text(str(Length-idx), size=5 ) ; } } }

I don't think issue 5135, at least as it pertains to BOSL2, is relevant. The code example only uses BOSL2 for the INCH definition and the xcopies() module, which just makes copies of the children. It doesn't create any polyhedra with duplicate points. On Thu, Dec 5, 2024 at 8:19 PM Marius Kintel via Discuss < discuss@lists.openscad.org> wrote: > On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss < > discuss@lists.openscad.org> wrote: > > > *WARNING: PolySet -> Manifold conversion failed: NotManifold* > > *Trying to repair and reconstruct mesh..* > > *Rendering cancelled on first warning.* > > *WARNING: No top level geometry to render* > > How does one go about locating the cause of such? The code follows: > > > For now: > 1. Turn off Preferences ->Advanced->OpenSCAD Language Features->Stop on > first warning > 2. Follow https://github.com/openscad/openscad/issues/5135 > > -Marius > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

On Dec 5, 2024, at 22:55, Adrian Mariano via Discuss <discuss@lists.openscad.org> wrote: > > I don't think issue 5135, at least as it pertains to BOSL2, is relevant. The code example only uses BOSL2 for the INCH definition and the xcopies() module, which just makes copies of the children. It doesn't create any polyhedra with duplicate points. > Oh, interesting. Then it’s probably a different issue indeed. I’ll take a closer look. -Marius

This might actually be a bug. The symptom is that the result of linear_extrude() becomes non-manifold at some point, and any operation combined with that one fails. If anyone is able to slim down this design to something non-BOSL and as small as possible, that would be immensely helpful. -Marius > On Dec 5, 2024, at 22:55, Adrian Mariano via Discuss <discuss@lists.openscad.org> wrote: > > I don't think issue 5135, at least as it pertains to BOSL2, is relevant. The code example only uses BOSL2 for the INCH definition and the xcopies() module, which just makes copies of the children. It doesn't create any polyhedra with duplicate points. > > On Thu, Dec 5, 2024 at 8:19 PM Marius Kintel via Discuss <discuss@lists.openscad.org <mailto:discuss@lists.openscad.org>> wrote: >>> On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss <discuss@lists.openscad.org <mailto:discuss@lists.openscad.org>> wrote: >>> >>> WARNING: PolySet -> Manifold conversion failed: NotManifold >>> >>> Trying to repair and reconstruct mesh.. >>> >>> Rendering cancelled on first warning. >>> >>> WARNING: No top level geometry to render >>> >>> How does one go about locating the cause of such? The code follows: >>> >> >> For now: >> 1. Turn off Preferences ->Advanced->OpenSCAD Language Features->Stop on first warning >> 2. Follow https://github.com/openscad/openscad/issues/5135 >> >> -Marius >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

My forest idea of paring it down is to start at both ends and remove/diff everything up to a point and check. Once you find that it creates a proper closed manifold, back up one step, and do the same from the other end. This should leave you with a section of a part that is creating a non-manifold. Either that, or modify the original code to only make a section (say 0-0.5, ... 3.75-4.0) and then you will only be dealing with the generative portion of the code. Hope that helps, EBo -- On Fri, Dec 6, 2024 at 12:59 AM Marius Kintel via Discuss < discuss@lists.openscad.org> wrote: > This might actually be a bug. > The symptom is that the result of linear_extrude() becomes non-manifold at > some point, and any operation combined with that one fails. > > If anyone is able to slim down this design to something non-BOSL and as > small as possible, that would be immensely helpful. > > -Marius > > On Dec 5, 2024, at 22:55, Adrian Mariano via Discuss < > discuss@lists.openscad.org> wrote: > > I don't think issue 5135, at least as it pertains to BOSL2, is relevant. > The code example only uses BOSL2 for the INCH definition and the xcopies() > module, which just makes copies of the children. It doesn't create any > polyhedra with duplicate points. > > On Thu, Dec 5, 2024 at 8:19 PM Marius Kintel via Discuss < > discuss@lists.openscad.org> wrote: > >> On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss < >> discuss@lists.openscad.org> wrote: >> >> >> *WARNING: PolySet -> Manifold conversion failed: NotManifold* >> >> *Trying to repair and reconstruct mesh..* >> >> *Rendering cancelled on first warning.* >> >> *WARNING: No top level geometry to render* >> >> How does one go about locating the cause of such? The code follows: >> >> >> For now: >> 1. Turn off Preferences ->Advanced->OpenSCAD Language Features->Stop on >> first warning >> 2. Follow https://github.com/openscad/openscad/issues/5135 >> >> -Marius >> >> _______________________________________________ >> 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 > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

 On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss
 <discuss@lists.openscad.org> wrote:

     /
     WARNING: PolySet -> Manifold conversion failed: NotManifold/

     /Trying to repair and reconstruct mesh../

     /Rendering cancelled on first warning./

     /WARNING: No top level geometry to render/

 How does one go about locating the cause of such? The code follows:

 For now:
 1. Turn off Preferences ->Advanced->OpenSCAD Language
 Features->Stop on first warning
 2. Follow https://github.com/openscad/openscad/issues/5135

  -Marius

 _______________________________________________
 OpenSCAD mailing list
 To unsubscribe send an email to discuss-leave@lists.openscad.org

If I remove the bos2l include, there are two references to that library. if I comment those out,  ('fwd' and 'xcopies') then afaik it runs OK (but not the same object is produced). I do not use bos2l, but if you wish, I could probably replicate the object in raw openscad script. Not sure what that would prove. On 06/12/2024 05:58, Marius Kintel via Discuss wrote: > This might actually be a bug. > The symptom is that the result of linear_extrude() becomes > non-manifold at some point, and any operation combined with that one > fails. > > If anyone is able to slim down this design to something non-BOSL and > as small as possible, that would be immensely helpful. > >  -Marius > >> On Dec 5, 2024, at 22:55, Adrian Mariano via Discuss >> <discuss@lists.openscad.org> wrote: >> >> I don't think issue 5135, at least as it pertains to BOSL2, is >> relevant.  The code example only uses BOSL2 for the INCH definition >> and the xcopies() module, which just makes copies of the children.  >> It doesn't create any polyhedra with duplicate points. >> >> On Thu, Dec 5, 2024 at 8:19 PM Marius Kintel via Discuss >> <discuss@lists.openscad.org> wrote: >> >>> On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss >>> <discuss@lists.openscad.org> wrote: >>> >>> / >>> WARNING: PolySet -> Manifold conversion failed: NotManifold/ >>> >>> /Trying to repair and reconstruct mesh../ >>> >>> /Rendering cancelled on first warning./ >>> >>> /WARNING: No top level geometry to render/ >>> >>> How does one go about locating the cause of such? The code follows: >>> >> >> For now: >> 1. Turn off Preferences ->Advanced->OpenSCAD Language >> Features->Stop on first warning >> 2. Follow https://github.com/openscad/openscad/issues/5135 >> >>  -Marius >> >> _______________________________________________ >> 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 > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email todiscuss-leave@lists.openscad.org

I’ve opened a new issue for this so we can investigate it properly: https://github.com/openscad/openscad/issues/5482 -Marius > On Dec 5, 2024, at 19:30, mike.fraser.1945+osc--- via Discuss <discuss@lists.openscad.org> wrote: > > Please excuse a possibly/probably dumb question from a newbe. > > I recently designed a 2D ruler for export to a CNC Router and & a Laser Engraver. Worked well. > > I then decided to emboss the pattern into a surface but get the following on render: > > Parsing design (AST generation)... > > Compiling design (CSG Tree generation)... > > Rendering Polygon Mesh using Manifold... > > WARNING: PolySet -> Manifold conversion failed: NotManifold > > Trying to repair and reconstruct mesh.. > > Rendering cancelled on first warning. > > WARNING: No top level geometry to render > > How does one go about locating the cause of such? The code follows: > > // Ruler-printable > > include <BOSL2/std.scad> > > Length = 4 ; //Overall length in Inches > > Thick = 3 ; > > len = Length*INCH ; > > mk1 = 1.0*INCH ; > > mk2 = mk1/2 ; > > mk4 = mk1/4 ; > > mk8 = mk1/8 ; > > mk16 = mk1/16 ; > > mk_width = 0.5 ; > > t1 = mk1/2 ; // length of tic marks > > t2 = t1/2 ; > > t4 = t1/3 ; > > t8 = t1/4 ; > > t16 = t1/5 ; > > spot = [mk1,mk2,mk4,mk8,mk16] ; > > tic = [t1,t2,t4,t8,t16] ; > > module mark(x) { > > square([mk_width, x]) ; > > } > > sp = [0,0,0] ; > > difference() { > > translate([-mk2/2,-6,-(Thick-1+0.01)]) cube([len+mk2,mk1,Thick]) ; > > linear_extrude(height=1) union() { > > fwd(3) square([len,3]) ; > > for (idx=[0:1:Length]) { > > xcopies(spot[idx], l=len, sp=sp) mark(tic[idx]) ; > > } > > xcopies(mk4,l=len-4, sp=[0,-6,0]) square(3) ; > > for (idx=[0:1:Length]) { > > translate([idx*mk1-1,14,0]) text(str(Length-idx), size=5 ) ; > > } > > } > > } > >