relative speeds of F6
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by cylinder,
would leave a smoother surface on both inside and outside of the thread.
If the cube is faster, I'll convert this code.
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
Genes Web page http://geneslinuxbox.net:6309/gene
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes:
2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes: 22387440
Total rendering time: 0:00:41.585 Total rendering time: 0:01:09.567
Top level object is a 3D object: Top level object is a 3D object:
Simple: yes Simple: yes
Vertices: 3998 Vertices: 10396
Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400
Facets: 2400 Facets: 5200
Volumes: 2 Volumes: 2
Rendering finished. Rendering finished.
On Wed, 9 Feb 2022 at 12:23, gene heskett gheskett@shentel.net wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by cylinder,
would leave a smoother surface on both inside and outside of the thread.
If the cube is faster, I'll convert this code.
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
Genes Web page http://geneslinuxbox.net:6309/gene
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
On Wednesday, February 9, 2022 6:40:14 AM EST Michael Möller wrote:
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes:
2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes:
22387440 Total rendering time: 0:00:41.585 Total rendering
time: 0:01:09.567 Top level object is a 3D object: Top level
object is a 3D object: Simple: yes
Simple: yes Vertices: 3998 Vertices:
10396 Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400 Facets:
2400 Facets: 5200 Volumes: 2
Volumes: 2 Rendering finished.
Rendering finished.
if the left column is cube, it wins, and the right column is cylinder,
its slower but they are not identified as to which is which here.
On Wed, 9 Feb 2022 at 12:23, gene heskett gheskett@shentel.net wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by
cylinder,
would leave a smoother surface on both inside and outside of the
thread.
If the cube is faster, I'll convert this code.
But Ray pointed out in a PM that for wood, I should use a buttress
thread, which they don't grind mills for, but a 60 degree engraving bit
with a 20 degree wedge under the motor mount would come pretty close, so
thats being considered.
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
Genes Web page http://geneslinuxbox.net:6309/gene
Michael,
I am puzzled as to why I am seeing only half the geometry that your cube test generates whilst the cylinder matches exactly.
But I do like the performance of Marius’s M1 native OpenSCAD build.
Cube
for ( i = [1:400] ) translate([i,i/2,i/4]) cube([1+i/100,2+i/88,2-i/88],center=true) ;
Geometry cache size in bytes: 323200
CGAL Polyhedrons in cache: 1
CGAL cache size in bytes: 2715136
Total rendering time: 0:00:02.859
Top level object is a 3D object:
Simple: yes
Vertices: 2012
Halfedges: 6036
Edges: 3018
Halffacets: 2100
Facets: 1050
Volumes: 23
Rendering finished.
Cylinder
for ( i = [1:400] ) translate([i,i/2,i/4]) cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 1712000
CGAL Polyhedrons in cache: 2
CGAL cache size in bytes: 16687952
Total rendering time: 0:00:17.202
Top level object is a 3D object:
Simple: yes
Vertices: 10396
Halfedges: 31188
Edges: 15594
Halffacets: 10400
Facets: 5200
Volumes: 2
Rendering finished.
On 9 Feb 2022, at 11:40, Michael Möller private2michael@gmail.com wrote:
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4]) cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4]) cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes: 2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes: 22387440
Total rendering time: 0:00:41.585 Total rendering time: 0:01:09.567
Top level object is a 3D object: Top level object is a 3D object:
Simple: yes Simple: yes
Vertices: 3998 Vertices: 10396
Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400
Facets: 2400 Facets: 5200
Volumes: 2 Volumes: 2
Rendering finished. Rendering finished.
On Wed, 9 Feb 2022 at 12:23, gene heskett <gheskett@shentel.net mailto:gheskett@shentel.net> wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by cylinder,
would leave a smoother surface on both inside and outside of the thread.
If the cube is faster, I'll convert this code.
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
Genes Web page <http://geneslinuxbox.net:6309/gene http://geneslinuxbox.net:6309/gene>
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
I am puzzled, too. I get the lower value now. Ah... sorry, cut-n-paste
error, that was from an earlier run
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ; // fewer
for ( i = [1:400] ) translate([i,i/2,i/4]) cube([1,2,3],center=true) ;
// more.
"I leave it to the reader as an exercise to explain why" ;-) - I haven't
the foggiest
On Wed, 9 Feb 2022 at 16:33, Bob Carter caggius@gmail.com wrote:
Michael,
I am puzzled as to why I am seeing only half the geometry that your cube
test generates whilst the cylinder matches exactly.
But I do like the performance of Marius’s M1 native OpenSCAD build.
Cube
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
Geometry cache size in bytes: 323200
CGAL Polyhedrons in cache: 1
CGAL cache size in bytes: 2715136
Total rendering time: 0:00:02.859
Top level object is a 3D object:
Simple: yes
Vertices: 2012
Halfedges: 6036
Edges: 3018
Halffacets: 2100
Facets: 1050
Volumes: 23
Rendering finished.
Cylinder
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 1712000
CGAL Polyhedrons in cache: 2
CGAL cache size in bytes: 16687952
Total rendering time: 0:00:17.202
Top level object is a 3D object:
Simple: yes
Vertices: 10396
Halfedges: 31188
Edges: 15594
Halffacets: 10400
Facets: 5200
Volumes: 2
Rendering finished.
On 9 Feb 2022, at 11:40, Michael Möller private2michael@gmail.com wrote:
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes:
2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes: 22387440
Total rendering time: 0:00:41.585 Total rendering time: 0:01:09.567
Top level object is a 3D object: Top level object is a 3D
object:
Simple: yes Simple: yes
Vertices: 3998 Vertices: 10396
Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400
Facets: 2400 Facets: 5200
Volumes: 2 Volumes: 2
Rendering finished. Rendering finished.
On Wed, 9 Feb 2022 at 12:23, gene heskett gheskett@shentel.net wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by cylinder,
would leave a smoother surface on both inside and outside of the thread.
If the cube is faster, I'll convert this code.
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
Genes Web page http://geneslinuxbox.net:6309/gene
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
"I leave it to the reader as an exercise to explain why" ;-) - I haven't
the foggiest
Perhaps because when i/88 > 2, the cube has 0 size in z?
On Wed, 9 Feb 2022, 22:11 gene heskett, gheskett@shentel.net wrote:
On Wednesday, February 9, 2022 6:40:14 AM EST Michael Möller wrote:
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes:
2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes:
22387440 Total rendering time: 0:00:41.585 Total rendering
time: 0:01:09.567 Top level object is a 3D object: Top level
object is a 3D object: Simple: yes
Simple: yes Vertices: 3998 Vertices:
10396 Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400 Facets:
2400 Facets: 5200 Volumes: 2
Volumes: 2 Rendering finished.
Rendering finished.
if the left column is cube, it wins, and the right column is cylinder,
its slower but they are not identified as to which is which here.
On Wed, 9 Feb 2022 at 12:23, gene heskett gheskett@shentel.net wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by
cylinder,
would leave a smoother surface on both inside and outside of the
thread.
If the cube is faster, I'll convert this code.
But Ray pointed out in a PM that for wood, I should use a buttress
thread, which they don't grind mills for, but a 60 degree engraving bit
with a 20 degree wedge under the motor mount would come pretty close, so
thats being considered.
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
Genes Web page http://geneslinuxbox.net:6309/gene
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Of course. <facepalm slap!>
It shows that a "quick test case" ... there is no such thing. A test case
needs as careful coding as a "real" code. I just threw in the
"/88 +-something" to make nonidentical cubes. Didn't think it through. Just
wanted to show that of course a cube is faster than a cylinder - less
triangles, no trigonometry and so on.
Well, now I have to go and wash this egg off my shirt ....;-)
On Thu, 10 Feb 2022 at 00:58, Will Hardiman bill.hardiman1995@gmail.com
wrote:
"I leave it to the reader as an exercise to explain why" ;-) - I
haven't the foggiest
Perhaps because when i/88 > 2, the cube has 0 size in z?
On Wed, 9 Feb 2022, 22:11 gene heskett, gheskett@shentel.net wrote:
On Wednesday, February 9, 2022 6:40:14 AM EST Michael Möller wrote:
Depends on too much else, so here is a (too ?) simple test
for ( i = [1:400] ) translate([i,i/2,i/4])
cube([1+i/100,2+i/88,2-i/88],center=true) ;
for ( i = [1:400] ) translate([i,i/2,i/4])
cylinder(r=3.2,h=3+i/100,center=true) ;
Geometry cache size in bytes: 291928 Geometry cache size in bytes:
2003928
CGAL Polyhedrons in cache: 1 CGAL Polyhedrons in cache: 3
CGAL cache size in bytes: 5699488 CGAL cache size in bytes:
22387440 Total rendering time: 0:00:41.585 Total rendering
time: 0:01:09.567 Top level object is a 3D object: Top level
object is a 3D object: Simple: yes
Simple: yes Vertices: 3998 Vertices:
10396 Halfedges: 12792 Halfedges: 31188
Edges: 6396 Edges: 15594
Halffacets: 4800 Halffacets: 10400 Facets:
2400 Facets: 5200 Volumes: 2
Volumes: 2 Rendering finished.
Rendering finished.
if the left column is cube, it wins, and the right column is cylinder,
its slower but they are not identified as to which is which here.
On Wed, 9 Feb 2022 at 12:23, gene heskett gheskett@shentel.net wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by
cylinder,
would leave a smoother surface on both inside and outside of the
thread.
If the cube is faster, I'll convert this code.
But Ray pointed out in a PM that for wood, I should use a buttress
thread, which they don't grind mills for, but a 60 degree engraving bit
with a 20 degree wedge under the motor mount would come pretty close, so
thats being considered.
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
Genes Web page http://geneslinuxbox.net:6309/gene
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
For what it's worth... in my experience, linear_extrude() of a circle or
a square will render /much/ faster than cylinder() or cube().
You can seamlessly replace cylinder()s with extruded circles by
including this module:
module cylinder(d,h,center=false) {
z = center? -h/2 : 0;
translate([0,0,z]) linear_extrude(height=h) circle(d=d);
}
On 2/9/2022 6:03 AM, gene heskett wrote:
Greetings all;
Whats the relative speed between:
359 iterations of a cylinder(h=3.175,r=5,center=true);
and 359 iterations of a cube with 3 var args,center=true?
The point being that a cube just wide enough vs a sq made by cylinder,
would leave a smoother surface on both inside and outside of the thread.
If the cube is faster, I'll convert this code.
Cheers, Gene Heskett.