Re: update / new features

Jean-Pierre Delange via ntg-context <[email protected]> Wed, 29 Jul 2026 18:08:21 +0200
Newsgroups	gmane.comp.tex.context
Message-ID	<[email protected]>
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Hi there,

I have now repeated the Chmutov test under WSL/Linux with a fresh cache=20
name, so this time I captured the actual initial calculation.

The result was:

 =C2=A0 =C2=A0 implicit mesh:
 =C2=A0 =C2=A0 3,096,000 vertices
 =C2=A0 =C2=A0 1,032,000 triangles

 =C2=A0 =C2=A0 mesh generation: 5.934 seconds
 =C2=A0 =C2=A0 triangle rendering: 0.381 seconds
 =C2=A0 =C2=A0 MetaPost total: 6.468 seconds
 =C2=A0 =C2=A0 ConTeXt runtime: 6.294 seconds

Measured with /usr/bin/time -v, the complete command took:

 =C2=A0 =C2=A0 wall-clock time: 6.35 seconds
 =C2=A0 =C2=A0 maximum resident set size: 399,644 kB
 =C2=A0 =C2=A0 CPU usage: 106%
 =C2=A0 =C2=A0 exit status: 0

The log reports a z-buffer of 1184 =C3=97 1184 pixels with supersampling =
2,=20
and about 594 MB of temporary memory cleaned up afterwards.

So the overall result on this Ryzen 5 5600 under WSL is almost identical=20
to your reported 6.277 seconds for the initial run.

See log file attached.

JP

Le 29/07/2026 =C3=A0 17:19, Hans Hagen via ntg-context a =C3=A9crit=C2=A0=
:
> On 7/29/2026 4:42 PM, Jim Diamond via ntg-context wrote:
>> On Wed, Jul 29, 2026 at 13:57 (+0200), Jean-Pierre Delange via=20
>> ntg-context wrote:
>>
>>> 2.
>>
>>> One internal cross-reference remains unresolved in the 3D document.
>>
>> I notice that luametafun-threed.tex has
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 reference=3Dfig:three=
d:process:2,
>> *twice*, once on like 513 and once on line 524.
>>
>> I'd hate to go out on a limb and say this is the problem, but I'm
>> suspicious.=C2=A0 =F0=9F=99=82
>
> indeed, so now that you joined the testing:
>
> \startMPpage
> lmt_scene_start [
> =C2=A0=C2=A0=C2=A0 width=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D =
10cm,
> =C2=A0=C2=A0=C2=A0 resolution=C2=A0=C2=A0 =3D 150,
> =C2=A0=C2=A0=C2=A0 supersample=C2=A0 =3D 2,
> =C2=A0=C2=A0=C2=A0 crop=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 =3D true,
> =C2=A0=C2=A0=C2=A0 projection=C2=A0=C2=A0 =3D "perspective",
> =C2=A0=C2=A0=C2=A0 light=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D =
(0,-1,-2),
> =C2=A0=C2=A0=C2=A0 eye=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 =3D (20,20,20),
> =C2=A0=C2=A0=C2=A0 target=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D (0,0,=
0),
> =C2=A0=C2=A0=C2=A0 up=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 =3D (0,0,1),
> =C2=A0=C2=A0=C2=A0 intensity=C2=A0=C2=A0=C2=A0 =3D 1.1,
> =C2=A0=C2=A0=C2=A0 cache=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D =
true,
> =C2=A0=C2=A0=C2=A0 name=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 =3D "example",
> ] ;
>
> lmt_scene_material [
> =C2=A0=C2=A0=C2=A0 name=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D "surface",
> =C2=A0=C2=A0=C2=A0 diffuse=C2=A0=C2=A0 =3D (.9,.6,.2),
> =C2=A0=C2=A0=C2=A0 specular=C2=A0 =3D (.5,.5,.5),
> =C2=A0=C2=A0=C2=A0 shininess =3D 25,
> =C2=A0=C2=A0=C2=A0 opacity=C2=A0=C2=A0 =3D 1,
> =C2=A0=C2=A0=C2=A0 ambient=C2=A0=C2=A0 =3D .25,
> ] ;
>
> lmt_scene_implicit [
> =C2=A0=C2=A0=C2=A0 id=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D "chmutov"=
,
> =C2=A0=C2=A0=C2=A0 code=C2=A0=C2=A0=C2=A0=C2=A0 =3D "32*(x*x*x*x*x*x + =
y*y*y*y*y*y + z*z*z*z*z*z) -=20
> 48*(x*x*x*x + y*y*y*y + z*z*z*z) + 18*(x*x + y*y + z*z) - 3",
> =C2=A0=C2=A0=C2=A0 dfdx=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*x*x*x*x*x - 19=
2*x*x*x + 36*x",
> =C2=A0=C2=A0=C2=A0 dfdy=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*y*y*y*y*y - 19=
2*y*y*y + 36*y",
> =C2=A0=C2=A0=C2=A0 dfdz=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*z*z*z*z*z - 19=
2*z*z*z + 36*z",
> =C2=A0=C2=A0=C2=A0 xmin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
> =C2=A0=C2=A0=C2=A0 xmax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
> =C2=A0=C2=A0=C2=A0 ymin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
> =C2=A0=C2=A0=C2=A0 ymax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
> =C2=A0=C2=A0=C2=A0 zmin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
> =C2=A0=C2=A0=C2=A0 zmax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
> =C2=A0=C2=A0=C2=A0 nx=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
> =C2=A0=C2=A0=C2=A0 ny=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
> =C2=A0=C2=A0=C2=A0 nz=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
> =C2=A0=C2=A0=C2=A0 material =3D "surface",
> =C2=A0=C2=A0=C2=A0 normal=C2=A0=C2=A0 =3D "smooth",
> ] ;
>
> lmt_scene_stop ;
>
> \stopMPpage
>
> Needs 6.277 for the initial run (5.866 metapost) .. only a million=20
> triangles and three times that on vertices. Kind of deep nested=20
> z-buffering here (some 1100 x 1100 pixels downsampled to 550x550 anti=20
> aliased). I bet that on this silicon graphics machine of your past it=20
> took more time but maybe not.
>
> Hans
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    <p>Hi there,<br>
      <br>
      I have now repeated the Chmutov test under WSL/Linux with a fresh
      cache name, so this time I captured the actual initial
      calculation.<br>
      <br>
      The result was:<br>
      <br>
      =C2=A0 =C2=A0 implicit mesh:<br>
      =C2=A0 =C2=A0 3,096,000 vertices<br>
      =C2=A0 =C2=A0 1,032,000 triangles<br>
      <br>
      =C2=A0 =C2=A0 mesh generation: 5.934 seconds<br>
      =C2=A0 =C2=A0 triangle rendering: 0.381 seconds<br>
      =C2=A0 =C2=A0 MetaPost total: 6.468 seconds<br>
      =C2=A0 =C2=A0 ConTeXt runtime: 6.294 seconds<br>
      <br>
      Measured with /usr/bin/time -v, the complete command took:<br>
      <br>
      =C2=A0 =C2=A0 wall-clock time: 6.35 seconds<br>
      =C2=A0 =C2=A0 maximum resident set size: 399,644 kB<br>
      =C2=A0 =C2=A0 CPU usage: 106%<br>
      =C2=A0 =C2=A0 exit status: 0<br>
      <br>
      The log reports a z-buffer of 1184 =C3=97 1184 pixels with
      supersampling 2, and about 594 MB of temporary memory cleaned up
      afterwards.<br>
      <br>
      So the overall result on this Ryzen 5 5600 under WSL is almost
      identical to your reported 6.277 seconds for the initial run.</p>
    <p>See log file attached.<br>
      <br>
      JP</p>
    <div class=3D"moz-cite-prefix">Le 29/07/2026 =C3=A0 17:19, Hans Hagen=
 via
      ntg-context a =C3=A9crit=C2=A0:<br>
    </div>
    <blockquote type=3D"cite"
      cite=3D"mid:[email protected]">On
      7/29/2026 4:42 PM, Jim Diamond via ntg-context wrote:
      <br>
      <blockquote type=3D"cite" style=3D"color: #007cff;">On Wed, Jul 29,
        2026 at 13:57 (+0200), Jean-Pierre Delange via ntg-context
        wrote:
        <br>
        <br>
        <blockquote type=3D"cite" style=3D"color: #007cff;">2.
          <br>
        </blockquote>
        <br>
        <blockquote type=3D"cite" style=3D"color: #007cff;">One internal
          cross-reference remains unresolved in the 3D document.
          <br>
        </blockquote>
        <br>
        I notice that luametafun-threed.tex has
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 reference=3Dfig:=
threed:process:2,
        <br>
        <b class=3D"moz-txt-star"><span class=3D"moz-txt-tag">*</span>twi=
ce<span
            class=3D"moz-txt-tag">*</span></b>, once on like 513 and once
        on line 524.
        <br>
        <br>
        I'd hate to go out on a limb and say this is the problem, but
        I'm
        <br>
        suspicious.=C2=A0 =F0=9F=99=82
        <br>
      </blockquote>
      <br>
      indeed, so now that you joined the testing:
      <br>
      <br>
      \startMPpage
      <br>
      lmt_scene_start [
      <br>
      =C2=A0=C2=A0=C2=A0 width=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
=3D 10cm,
      <br>
      =C2=A0=C2=A0=C2=A0 resolution=C2=A0=C2=A0 =3D 150,
      <br>
      =C2=A0=C2=A0=C2=A0 supersample=C2=A0 =3D 2,
      <br>
      =C2=A0=C2=A0=C2=A0 crop=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 =3D true,
      <br>
      =C2=A0=C2=A0=C2=A0 projection=C2=A0=C2=A0 =3D "perspective",
      <br>
      =C2=A0=C2=A0=C2=A0 light=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
=3D (0,-1,-2),
      <br>
      =C2=A0=C2=A0=C2=A0 eye=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 =3D (20,20,20),
      <br>
      =C2=A0=C2=A0=C2=A0 target=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D (=
0,0,0),
      <br>
      =C2=A0=C2=A0=C2=A0 up=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 =3D (0,0,1),
      <br>
      =C2=A0=C2=A0=C2=A0 intensity=C2=A0=C2=A0=C2=A0 =3D 1.1,
      <br>
      =C2=A0=C2=A0=C2=A0 cache=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
=3D true,
      <br>
      =C2=A0=C2=A0=C2=A0 name=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 =3D "example",
      <br>
      ] ;
      <br>
      <br>
      lmt_scene_material [
      <br>
      =C2=A0=C2=A0=C2=A0 name=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D "surface"=
,
      <br>
      =C2=A0=C2=A0=C2=A0 diffuse=C2=A0=C2=A0 =3D (.9,.6,.2),
      <br>
      =C2=A0=C2=A0=C2=A0 specular=C2=A0 =3D (.5,.5,.5),
      <br>
      =C2=A0=C2=A0=C2=A0 shininess =3D 25,
      <br>
      =C2=A0=C2=A0=C2=A0 opacity=C2=A0=C2=A0 =3D 1,
      <br>
      =C2=A0=C2=A0=C2=A0 ambient=C2=A0=C2=A0 =3D .25,
      <br>
      ] ;
      <br>
      <br>
      lmt_scene_implicit [
      <br>
      =C2=A0=C2=A0=C2=A0 id=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D "chmu=
tov",
      <br>
      =C2=A0=C2=A0=C2=A0 code=C2=A0=C2=A0=C2=A0=C2=A0 =3D "32*(x*x*x*x*x*=
x + y*y*y*y*y*y + z*z*z*z*z*z) -
      48*(x*x*x*x + y*y*y*y + z*z*z*z) + 18*(x*x + y*y + z*z) - 3",
      <br>
      =C2=A0=C2=A0=C2=A0 dfdx=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*x*x*x*x*x =
- 192*x*x*x + 36*x",
      <br>
      =C2=A0=C2=A0=C2=A0 dfdy=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*y*y*y*y*y =
- 192*y*y*y + 36*y",
      <br>
      =C2=A0=C2=A0=C2=A0 dfdz=C2=A0=C2=A0=C2=A0=C2=A0 =3D "192*z*z*z*z*z =
- 192*z*z*z + 36*z",
      <br>
      =C2=A0=C2=A0=C2=A0 xmin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 xmax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 ymin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 ymax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 zmin=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 zmax=C2=A0=C2=A0=C2=A0=C2=A0 =3D=C2=A0 1.3,
      <br>
      =C2=A0=C2=A0=C2=A0 nx=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
      <br>
      =C2=A0=C2=A0=C2=A0 ny=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
      <br>
      =C2=A0=C2=A0=C2=A0 nz=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 150,
      <br>
      =C2=A0=C2=A0=C2=A0 material =3D "surface",
      <br>
      =C2=A0=C2=A0=C2=A0 normal=C2=A0=C2=A0 =3D "smooth",
      <br>
      ] ;
      <br>
      <br>
      lmt_scene_stop ;
      <br>
      <br>
      \stopMPpage
      <br>
      <br>
      Needs 6.277 for the initial run (5.866 metapost) .. only a million
      triangles and three times that on vertices. Kind of deep nested
      z-buffering here (some 1100 x 1100 pixels downsampled to 550x550
      anti aliased). I bet that on this silicon graphics machine of your
      past it took more time but maybe not.
      <br>
      <br>
      Hans</blockquote>
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