Re: [OpenSCAD] rotate around a "virtual axis"
You will need all the files in that gist, not just the example file. Use
git clone https://gist.github.com/a03bc32a5c5ca6886e38.git
geodesic_example to grab them all.
Here's a screenshot of what it looks like, for reference:
1v:
https://www.dropbox.com/s/0u9fqhan209v1la/Screenshot%202015-06-05%2011.53.50.png?dl=0
2v:
https://www.dropbox.com/s/9rc66pfocnq25v7/Screenshot%202015-06-05%2011.53.40.png?dl=0
3v:
https://www.dropbox.com/s/vzd2ox8zez2rnb7/Screenshot%202015-06-05%2011.53.07.png?dl=0
misch.mash mailto:mischakavin@gmail.com
June 5, 2015 at 11:48
You may be interested in Goldberg Polyhedra. Basically, the
generalised form
of the soccer ball. Based on what I've seen in youtube videos, someone
must
have parametrised them.
@Hypher: I tried running your code in the response, but it's dependent
on a
"platonic.scad" I either don't have or am not pointed to by default
(please
excuse if this is a newbie mistake.)
--
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Yona Appletree mailto:hypher@gmail.com
June 5, 2015 at 00:40
Emanuele,
Here's another thing that has the hexagons and pentagons calculated:
http://www.thingiverse.com/thing:334955
That thing (and most of the others I've seen) "cheat" in the sense
that they don't actually do face sub-division, which is a bit tricky
to implement in the OpenSCAD language.
I've created a gist,
https://gist.github.com/Yona-Appletree/a03bc32a5c5ca6886e38 with my
implementation of geodesic slicing. The geodesic_example.scad file
contains an example of using the library. You'll have to excuse the
quality of the code... I was just learning OpenSCAD and geodesic math
at the time, so it's kind of funky, but it does work correctly, as far
as I know.
Best,
Yona
Emanuele Spatola mailto:emanuele.spatola@gmail.com
June 4, 2015 at 17:56
After almost a day of failed attempts and research, I found out what I
wanted to create is not physically possible :)
or at least it's not possible just with hexagons, you need to put some
pentagons in the middle.
The name of the polyhedron is Geodesic Sphere dual:
http://en.wikipedia.org/wiki/Geodesic_dome#Chord_factors
the design is not as straightforward as I thought, I found a couple of
.scad sources:
http://www.thingiverse.com/thing:345775
http://www.thingiverse.com/thing:65820
but they are not parametric.
Also turned out openJsC
http://openjscad.org/#examples/sphere.jscadAD has a geodesic sphere
built in:
https://plus.google.com/+ReneKMueller/posts/5hp2CcMRJqu
So now I'm playing with the geodesic sphere source code trying to make
what I need:
http://openjscad.org/#examples/geodesic-sphere.jscad
Thanks to everybody who helped!!
Emanuele
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Emanuele Spatola mailto:emanuele.spatola@gmail.com
June 3, 2015 at 17:39
Hi guys,
I'm trying without much success to create something that looks like this:
http://www.thingiverse.com/thing:282868
To be more specific the goal is to create an empty sphere where the
surface has hexagonal-shaped holes (arranged like a bee nest).
I've tried many approaches, the one I think could be the best is the
following:
- cut an hexagon
- for ( k = [0 : 60 : 360] ) rotate([offset_deg,0,k]) cut hexagon
- recursively repeat for each of the six hexagon using as z-axis the
line connecting the center of the sphere to the current hexagon.
I was not able to implement that solution since as far as I now it's
not possible to rotate around a "virtual axis"
That's another possible (buggy) implementation (it takes around 1 min
to render):
https://gist.github.com/Emanuele-Spatola/17680d59f173bbc78d79
Any help would be really appreciated!
Thanks,
Emanuele
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You will need all the files in that gist, not just the example file. Use git
clone https://gist.github.com/a03bc32a5c5ca6886e38.git geodesic_example to
grab them all.
Thanks. Completely misunderstood on my end; I thought gist was basically
pastebin + versioning. The page actually has a button to download the lot,
but I mistook it as an offer of software.
Code's rendering well, but I'm getting some vertices numbered twice?
I'd like to see a screenshot of that for reference. It's probably a bug
in how I'm de-duping the vertices... I'm basically computing all the
faces separately, then using a function to find the unique vertex
locations. It's possible that a floating-point equality issue or other
bug is causing some of the vertices to be repeated. It wasn't a
requirement for my original use of the code for the vertices to be
unique, so I didn't really check that.
- Yona
Mischa Kavin mailto:mischakavin@gmail.com
June 5, 2015 at 15:28
You will need all the files in that gist, not just the example
file. Use git clone
https://gist.github.com/a03bc32a5c5ca6886e38.git geodesic_example
to grab them all.
Thanks. Completely misunderstood on my end; I thought gist was
basically pastebin + versioning. The page actually has a button to
download the lot, but I mistook it as an offer of software.
Code's rendering well, but I'm getting some vertices numbered twice?
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Yona Appletree mailto:hypher@gmail.com
June 5, 2015 at 11:54
You will need all the files in that gist, not just the example file.
Use git clone https://gist.github.com/a03bc32a5c5ca6886e38.git
geodesic_example to grab them all.
Here's a screenshot of what it looks like, for reference:
1v:
https://www.dropbox.com/s/0u9fqhan209v1la/Screenshot%202015-06-05%2011.53.50.png?dl=0
2v:
https://www.dropbox.com/s/9rc66pfocnq25v7/Screenshot%202015-06-05%2011.53.40.png?dl=0
3v:
https://www.dropbox.com/s/vzd2ox8zez2rnb7/Screenshot%202015-06-05%2011.53.07.png?dl=0
Yona Appletree mailto:hypher@gmail.com
June 5, 2015 at 11:51
You will need all the files in that gist, not just the example file.
Use git clone https://gist.github.com/a03bc32a5c5ca6886e38.git
geodesic_example to grab them all.
Here's a screenshot of what it looks like, for reference:
1v:
2v:
3v:
misch.mash mailto:mischakavin@gmail.com
June 5, 2015 at 11:48
You may be interested in Goldberg Polyhedra. Basically, the
generalised form
of the soccer ball. Based on what I've seen in youtube videos, someone
must
have parametrised them.
@Hypher: I tried running your code in the response, but it's dependent
on a
"platonic.scad" I either don't have or am not pointed to by default
(please
excuse if this is a newbie mistake.)
--
View this message in context:
http://forum.openscad.org/rotate-around-a-virtual-axis-tp12779p12797.html
Sent from the OpenSCAD mailing list archive at Nabble.com.
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Yona Appletree mailto:hypher@gmail.com
June 5, 2015 at 00:40
Emanuele,
Here's another thing that has the hexagons and pentagons calculated:
http://www.thingiverse.com/thing:334955
That thing (and most of the others I've seen) "cheat" in the sense
that they don't actually do face sub-division, which is a bit tricky
to implement in the OpenSCAD language.
I've created a gist,
https://gist.github.com/Yona-Appletree/a03bc32a5c5ca6886e38 with my
implementation of geodesic slicing. The geodesic_example.scad file
contains an example of using the library. You'll have to excuse the
quality of the code... I was just learning OpenSCAD and geodesic math
at the time, so it's kind of funky, but it does work correctly, as far
as I know.
Best,
Yona
