Rounding Edges

Hi Jesse,

I have extended openscad with a 2D 'loop' primitive that
could be of some help. It cannot replace a true 3d round-off
operator, but with extrusion you can bring 2D rounded edges
to live. See the example. Also polygons, arcs and beziers
are possible. It posted this before, but there were
exactly zero reactions, so i am curious if it worthwhile
to publish the code.

Attached cube.png was made with this:

module base(axis)
{ rotate(90,axis)
    linear_extrude(height=10, center=true)
      loop(poly=[4,"flat",[10]], vertices=[["arc",1]], edges=[["wav",2,1]]); }

intersection()
{ base([1,0,0]);
  base([0,1,0]);
  base([0,0,1]); }



 I

On 23-05-13 02:44, Jesse Guardiani wrote:
> Hey List,
>
> I've been doing rounded edges manually using hollowed out cylinders. This
> part is a good example:
> http://www.createthis.com/products/impala-heater-knob-scad
>
> It's a real pain in the balls. Long and laborious. There has to be a better
> way. Any ideas?
>
>
>

> _______________________________________________
> OpenSCAD mailing list
> [hidden email]
> http://rocklinux.net/mailman/listinfo/openscad
> http://openscad.org - https://flattr.com/thing/121566
>

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On 23 May 2013 10:44, Jesse Guardiani <[hidden email]> wrote:

Hey List,

I've been doing rounded edges manually using hollowed out cylinders. This part is a good example: http://www.createthis.com/products/impala-heater-knob-scad

It's a real pain in the balls. Long and laborious. There has to be a better way. Any ideas?

as Whosawhatsis says, hull is awesome for rounded shapes!

see http://triffid-hunter.no-ip.info/MMax_x-end-motor.png and http://triffid-hunter.no-ip.info/MMax_x-end-motor.scad for example

the basic construction goes like this:

hull() {

for (i=[0:3])

translate([(i % 2) * 30, (i - i % 2) * 20, 0]) {

cylinder(r=5, h=1);

translate([0, 0, 10]) sphere(5);

}

}

although as you can see from my scad I prefer to use toruses for the upper corners rather than spheres

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Jesse,

If you copy paste the code below (in version 2013.01),
it should work, and is a rude version of the previous
example. (see attachment)

Note btw that OpenCSG (F5) has a hard time rendering
this, use CGAL instead (F6).

module base(axis)
{ rotate(90,axis)
    linear_extrude(height=10, center=true)

      polygon([[ 4, 0],[ 5, 1],[ 5, 4],[ 4, 5],[ 1, 5],
               [ 0, 4],[-1, 5],[-4, 5],[-5, 4],[-5, 1],
               [-4, 0],[-5,-1],[-5,-4],[-4,-5],[-1,-5],
               [ 0,-4],[ 1,-5],[ 4,-5],[ 5,-4],[ 5,-1] ]); }

intersection()
{ base([1,0,0]);
  base([0,1,0]);
  base([0,0,1]); }

Ruud

On 23-05-13 15:24, Jesse Guardiani wrote:

Ruud,

That would probably make more sense to me if I could see the intermediary
steps. I tried the code without the loop command and got:

WARNING: No top level geometry to render


I don't extrude things very often.




On Thu, May 23, 2013 at 3:26 AM, Ruud Vlaming <[hidden email]> wrote:

Hi Jesse,

I have extended openscad with a 2D 'loop' primitive that
could be of some help. It cannot replace a true 3d round-off
operator, but with extrusion you can bring 2D rounded edges
to live. See the example. Also polygons, arcs and beziers
are possible. It posted this before, but there were
exactly zero reactions, so i am curious if it worthwhile
to publish the code.

Attached cube.png was made with this:

module base(axis)
{ rotate(90,axis)
     linear_extrude(height=10, center=true)
       loop(poly=[4,"flat",[10]], vertices=[["arc",1]],
edges=[["wav",2,1]]); }

intersection()
{ base([1,0,0]);
   base([0,1,0]);
   base([0,0,1]); }



  I

On 23-05-13 02:44, Jesse Guardiani wrote:

Hey List,

I've been doing rounded edges manually using hollowed out cylinders. This
part is a good example:
http://www.createthis.com/products/impala-heater-knob-scad

It's a real pain in the balls. Long and laborious. There has to be a

better

way. Any ideas?



_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

Jesse,

If you copy paste the code below (in version 2013.01),
it should work, and is a rude version of the previous
example. (see attachment)

Note btw that OpenCSG (F5) has a hard time rendering
this, use CGAL instead (F6).

module base(axis)
{ rotate(90,axis)
    linear_extrude(height=10, center=true)

      polygon([[ 4, 0],[ 5, 1],[ 5, 4],[ 4, 5],[ 1, 5],
               [ 0, 4],[-1, 5],[-4, 5],[-5, 4],[-5, 1],
               [-4, 0],[-5,-1],[-5,-4],[-4,-5],[-1,-5],
               [ 0,-4],[ 1,-5],[ 4,-5],[ 5,-4],[ 5,-1] ]); }

intersection()
{ base([1,0,0]);
  base([0,1,0]);
  base([0,0,1]); }

Ruud

On 23-05-13 15:24, Jesse Guardiani wrote:

Ruud,

That would probably make more sense to me if I could see the intermediary
steps. I tried the code without the loop command and got:

WARNING: No top level geometry to render


I don't extrude things very often.




On Thu, May 23, 2013 at 3:26 AM, Ruud Vlaming <[hidden email]> wrote:

Hi Jesse,

I have extended openscad with a 2D 'loop' primitive that
could be of some help. It cannot replace a true 3d round-off
operator, but with extrusion you can bring 2D rounded edges
to live. See the example. Also polygons, arcs and beziers
are possible. It posted this before, but there were
exactly zero reactions, so i am curious if it worthwhile
to publish the code.

Attached cube.png was made with this:

module base(axis)
{ rotate(90,axis)
     linear_extrude(height=10, center=true)
       loop(poly=[4,"flat",[10]], vertices=[["arc",1]],
edges=[["wav",2,1]]); }

intersection()
{ base([1,0,0]);
   base([0,1,0]);
   base([0,0,1]); }



  I

On 23-05-13 02:44, Jesse Guardiani wrote:

Hey List,

I've been doing rounded edges manually using hollowed out cylinders. This
part is a good example:
http://www.createthis.com/products/impala-heater-knob-scad

It's a real pain in the balls. Long and laborious. There has to be a

better

way. Any ideas?



_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://rocklinux.net/mailman/listinfo/openscad
http://openscad.org - https://flattr.com/thing/121566