D
drewa1
Tue, May 22, 2018 2:46 AM
Here is my code for a honeycomb cell:
module hexagon(h,s,t,x){
difference(){
linear_extrude (height = h, center = false) circle (s, $fn=6, center =
true);
linear_extrude (height = h+1, center = false) translate ([0,0,-1])
circle (s-t, $fn=6, center = true);
}
}
module honeycomb (h,s,t,x){
hexagon(h,s,t,x);
outsidenodes=[
/*0*/[s,0,h+x],
/*1*/[s,0,h],
/*2*/[s/2,(s*sqrt(3))/2,h],
/*3*/[-s/2,(s*sqrt(3))/2,h],
/*4*/[-s/2,(s*sqrt(3))/2,h+x],
/*5*/[-s,0,h],
/*6*/[-s/2,-(s*sqrt(3))/2,h],
/*7*/[-s/2,-(s*sqrt(3))/2,h+x],
/*8*/[s/2,-(s*sqrt(3))/2,h],
/*9*/[0,0,h+2*x]
];
outsideface=[
[1,0,9,2],
[8,9,0,1],
[6,7,9,8],
[5,9,7,6],
[3,4,9,5],
[2,9,4,3]
];
union(){
polyhedron (outsidenodes, outsideface) hexagon(h,s,t,x);
}
union(){
scale ([1-(2t)/(2s),1-(2t)/(2s),1]) polyhedron (outsidenodes,
outsideface);
}
}
honeycomb(10,5,1,(5*sqrt(2))/4);
And here is the console output:
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
PolySet has nonplanar faces. Attempting alternate construction
PolySet has nonplanar faces. Attempting alternate construction
Geometries in cache: 9
Geometry cache size in bytes: 6624
CGAL Polyhedrons in cache: 4
CGAL cache size in bytes: 186912
Total rendering time: 0 hours, 0 minutes, 4 seconds
Top level object is a 3D object:
Simple: no
Vertices: 33
Halfedges: 128
Edges: 64
Halffacets: 66
Facets: 33
Volumes: 2
WARNING: Object may not be a valid 2-manifold and may need repair!
Rendering finished.
I am relatively new to this, so any input is appreciated. I am probably
missing something pretty basic. How can I merge a polyhedron to an object
created with linear_extrude. Is it something wrong with the polyhedron
itself?
Thanks in advance.
--
Sent from: http://forum.openscad.org/
Here is my code for a honeycomb cell:
module hexagon(h,s,t,x){
difference(){
linear_extrude (height = h, center = false) circle (s, $fn=6, center =
true);
linear_extrude (height = h+1, center = false) translate ([0,0,-1])
circle (s-t, $fn=6, center = true);
}
}
module honeycomb (h,s,t,x){
hexagon(h,s,t,x);
outsidenodes=[
/*0*/[s,0,h+x],
/*1*/[s,0,h],
/*2*/[s/2,(s*sqrt(3))/2,h],
/*3*/[-s/2,(s*sqrt(3))/2,h],
/*4*/[-s/2,(s*sqrt(3))/2,h+x],
/*5*/[-s,0,h],
/*6*/[-s/2,-(s*sqrt(3))/2,h],
/*7*/[-s/2,-(s*sqrt(3))/2,h+x],
/*8*/[s/2,-(s*sqrt(3))/2,h],
/*9*/[0,0,h+2*x]
];
outsideface=[
[1,0,9,2],
[8,9,0,1],
[6,7,9,8],
[5,9,7,6],
[3,4,9,5],
[2,9,4,3]
];
union(){
polyhedron (outsidenodes, outsideface) hexagon(h,s,t,x);
}
union(){
scale ([1-(2*t)/(2*s),1-(2*t)/(2*s),1]) polyhedron (outsidenodes,
outsideface);
}
}
honeycomb(10,5,1,(5*sqrt(2))/4);
And here is the console output:
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
PolySet has nonplanar faces. Attempting alternate construction
PolySet has nonplanar faces. Attempting alternate construction
Geometries in cache: 9
Geometry cache size in bytes: 6624
CGAL Polyhedrons in cache: 4
CGAL cache size in bytes: 186912
Total rendering time: 0 hours, 0 minutes, 4 seconds
Top level object is a 3D object:
Simple: no
Vertices: 33
Halfedges: 128
Edges: 64
Halffacets: 66
Facets: 33
Volumes: 2
WARNING: Object may not be a valid 2-manifold and may need repair!
Rendering finished.
I am relatively new to this, so any input is appreciated. I am probably
missing something pretty basic. How can I merge a polyhedron to an object
created with linear_extrude. Is it something wrong with the polyhedron
itself?
Thanks in advance.
--
Sent from: http://forum.openscad.org/
M
MichaelAtOz
Tue, May 22, 2018 3:12 AM
Also, you can't build an object that way with two poly's, you need to make it
enclosed (manifold - waterproof, no purple on the outside), so if you closed
off the bottom, then you could, for example, difference() a smaller one from
a larger one to make the hollow inside.
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Sent from: http://forum.openscad.org/
Also, you can't build an object that way with two poly's, you need to make it
enclosed (manifold - waterproof, no purple on the outside), so if you closed
off the bottom, then you could, for example, difference() a smaller one from
a larger one to make the hollow inside.
-----
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
--
Sent from: http://forum.openscad.org/
M
MichaelAtOz
Tue, May 22, 2018 3:33 AM
http://forum.openscad.org/file/t359/open_bottom_poly.jpg
This is one poly upside-down, note it has not got a bottom, just the top
shell.
In this case the faces are pointing outside but you see the inside purple
faces thru this hole.
It is not a valid 3D object.
If you put a face(s) on the bottom, that will cover the hole and make it a
3D object.
Think of a cube() and what it would be like if you removed one face.
Then you can sale the 3D object smaller, and difference this from the
original, you will get a proper 3D object.
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Sent from: http://forum.openscad.org/
<http://forum.openscad.org/file/t359/open_bottom_poly.jpg>
This is one poly upside-down, note it has not got a bottom, just the top
shell.
In this case the faces are pointing outside but you see the inside purple
faces thru this hole.
It is not a valid 3D object.
If you put a face(s) on the bottom, that will cover the hole and make it a
3D object.
Think of a cube() and what it would be like if you removed one face.
Then you can sale the 3D object smaller, and difference this from the
original, you will get a proper 3D object.
-----
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
--
Sent from: http://forum.openscad.org/
M
MichaelAtOz
Tue, May 22, 2018 3:42 AM
Try this:
difference() {
cube(50,true);
translate([0,0,10.01])
cube(30,true);
}
Compare how this has thickness and faces on the inside of the hole, building
an enclosed 3D object.
All the purple is inside that thickness.
That is what your shape needs to be like.
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Sent from: http://forum.openscad.org/
Try this:
difference() {
cube(50,true);
translate([0,0,10.01])
cube(30,true);
}
Compare how this has thickness and faces on the inside of the hole, building
an enclosed 3D object.
All the purple is inside that thickness.
That is what your shape needs to be like.
-----
Admin - PM me if you need anything, or if I've done something stupid...
Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
--
Sent from: http://forum.openscad.org/
