Extrude curve generated elsewhere
I want to generate a shape according to an equation and somehow get this into
openscad and then extrude it into a 3d form.
The curve consists of lots and lots of points and while I could script up
something to generate code like this:
polygon([[0,0],[0,0.1].............) it would be a huge pain in the arse on
account of the number of points I want to use.
I've tried rendering the 2-d slice as a .png and then using surface to load it
(this would be ok for my purposes) but surface insists on sticking voxels
where the height=0 which I don't want and something went wrong in openscad
because openscad rapidly needed 13Gb RAM to import my .png so I gave up.
Next I thought I'd try rendering the bit map in something that could vectorise
it and then save as .dxf format but openscad did not like the dxf inkscape
produced (unsupported entity SEQEND VERTEX POLYLINE).
Next I thought I'd script the shape generation in .off format but while I can
produce a nice 2d shape using import("myfile.off") I cannot extrude it into 3D
because openscad chokes on it complaining "WARNING: Ignoring 3D child object
for 2D operation ".
I can't generate the points in openscad because the proceedure is too complex.
Suggestions please as to how I can load points into open scad, convert them to
a polygon and extrude them please!
Thanks
SASA
SASA, have you tried using Inkscape to create your 2d shape, followed with the Inkscape extension for OpenSCAD? I've had good success with the limited projects I've created.
On Tuesday, January 19, 2016 2:08 PM, "superaorta@gmail.com" <superaorta@gmail.com> wrote:
I want to generate a shape according to an equation and somehow get this into
openscad and then extrude it into a 3d form.
The curve consists of lots and lots of points and while I could script up
something to generate code like this:
polygon([[0,0],[0,0.1].............) it would be a huge pain in the arse on
account of the number of points I want to use.
I've tried rendering the 2-d slice as a .png and then using surface to load it
(this would be ok for my purposes) but surface insists on sticking voxels
where the height=0 which I don't want and something went wrong in openscad
because openscad rapidly needed 13Gb RAM to import my .png so I gave up.
Next I thought I'd try rendering the bit map in something that could vectorise
it and then save as .dxf format but openscad did not like the dxf inkscape
produced (unsupported entity SEQEND VERTEX POLYLINE).
Next I thought I'd script the shape generation in .off format but while I can
produce a nice 2d shape using import("myfile.off") I cannot extrude it into 3D
because openscad chokes on it complaining "WARNING: Ignoring 3D child object
for 2D operation ".
I can't generate the points in openscad because the proceedure is too complex.
Suggestions please as to how I can load points into open scad, convert them to
a polygon and extrude them please!
Thanks
SASA
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
On 01/19/2016 08:07 PM, superaorta@gmail.com wrote:
I want to generate a shape according to an equation and somehow get this into
openscad and then extrude it into a 3d form.
[snip]
I can't generate the points in openscad because the proceedure is too complex.
If the equation is not secret, maybe post it anyway? Someone might have
a solution how to do it in OpenSCAD.
Suggestions please as to how I can load points into open scad, convert them to
a polygon and extrude them please!
If you already have the points as text data, you can just stick those into a file,
e.g. as points.scad
[ x1, y1 ],
[ x2, y2 ],
...
and include this into some other OpenSCAD file
points = [
include <points.scad>
];
polygon(points);
ciao,
Torsten.
Torsten,
Ok that's a nice suggestion I'll give it a go -
The "equation" isn't secret but is a lengthy matlab script with lots of calls
to library functions that would be a big undertaking to redo in openscad.
Thanks,
SASA
On Tuesday 19 Jan 2016 20:29:09 Torsten Paul wrote:
On 01/19/2016 08:07 PM, superaorta@gmail.com wrote:
I want to generate a shape according to an equation and somehow get this
into openscad and then extrude it into a 3d form.
[snip]
I can't generate the points in openscad because the proceedure is too
complex.
If the equation is not secret, maybe post it anyway? Someone might have
a solution how to do it in OpenSCAD.
Suggestions please as to how I can load points into open scad, convert
them to a polygon and extrude them please!
If you already have the points as text data, you can just stick those into a
file, e.g. as points.scad
[ x1, y1 ],
[ x2, y2 ],
...
and include this into some other OpenSCAD file
points = [
include <points.scad>
];
polygon(points);
ciao,
Torsten.
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Fred,
I haven't tried this extension but I think I'll try Torsten's suggestion first
as this is more suited to scripting.
thanks anyway,
SASA
On Tuesday 19 Jan 2016 19:14:53 fred wrote:
SASA, have you tried using Inkscape to create your 2d shape, followed with
the Inkscape extension for OpenSCAD? I've had good success with the limited
projects I've created.
On Tuesday, January 19, 2016 2:08 PM, "superaorta@gmail.com"
superaorta@gmail.com wrote:
I want to generate a shape according to an equation and somehow get this
into openscad and then extrude it into a 3d form.
The curve consists of lots and lots of points and while I could script up
something to generate code like this:
polygon([[0,0],[0,0.1].............) it would be a huge pain in the arse on
account of the number of points I want to use.
I've tried rendering the 2-d slice as a .png and then using surface to load
it (this would be ok for my purposes) but surface insists on sticking
voxels where the height=0 which I don't want and something went wrong in
openscad because openscad rapidly needed 13Gb RAM to import my .png so I
gave up.
Next I thought I'd try rendering the bit map in something that could
vectorise it and then save as .dxf format but openscad did not like the dxf
inkscape produced (unsupported entity SEQEND VERTEX POLYLINE).
Next I thought I'd script the shape generation in .off format but while I
can produce a nice 2d shape using import("myfile.off") I cannot extrude it
into 3D because openscad chokes on it complaining "WARNING: Ignoring 3D
child object for 2D operation ".
I can't generate the points in openscad because the proceedure is too
complex.
Suggestions please as to how I can load points into open scad, convert them
to a polygon and extrude them please!
Thanks
SASA
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Hey,
[…] but openscad did not like the dxf inkscape
produced (unsupported entity SEQEND VERTEX POLYLINE).
You may have more luck with exporting as "Desktop Cutting Plotter (R13) (*.dxf)”
We also have an SVG importer in the works, but it requires a bit more work: https://github.com/openscad/openscad/pull/834
..and there’s the Inkscape plugin for saving OpenSCAD files: http://www.thingiverse.com/thing:25036
-Marius
Thanks everyone!
Torsten's suggestion is working perfectly and is well suited to my needs.
My scad file now looks like this:
p1=[ include <points_1.scad> ];
linear_extrude(height=10)polygon(p1);
p2=[ include <points_2.scad> ];
linear_extrude(height=10)polygon(p2);
p3=[ include <points_3.scad> ];
linear_extrude(height=10)polygon(p3);
p4=[ include <points_4.scad> ];
linear_extrude(height=10)polygon(p4);
...
If anyone knows how I might parameterise this neatly so I could do something
like
for i=1:20
p(i)=[ include <points_$i.scad];
linear_extrude(height=10)polygon(p(i));
end
That would be great, but for now it works perfectly...
SASA
On Tuesday 19 Jan 2016 15:13:39 Marius Kintel wrote:
Hey,
[…] but openscad did not like the dxf inkscape
produced (unsupported entity SEQEND VERTEX POLYLINE).
You may have more luck with exporting as "Desktop Cutting Plotter (R13)
(*.dxf)”
We also have an SVG importer in the works, but it requires a bit more work:
https://github.com/openscad/openscad/pull/834
..and there’s the Inkscape plugin for saving OpenSCAD files:
http://www.thingiverse.com/thing:25036
-Marius
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
On 01/19/2016 09:34 PM, superaorta@gmail.com wrote:
If anyone knows how I might parameterise this neatly so I could do something
like
for i=1:20
p(i)=[ include <points_$i.scad];
linear_extrude(height=10)polygon(p(i));
end
That would be great, but for now it works perfectly...
Add another dimension to the array and import into a single
variable?
ciao,
Torsten.
I've developed another problem trying to do this that probably resides outside
openscad but in case anyone is familiar with it here goes:
I generate my family of curves in openscad and and it looks fine - I export the
curves as .stl and load into cura and it looks file, I then look at the tool
path and some of the curves are missing. I suspect my feature size is a bit
small but other smaller features produced using primitive shapes (cube) always
get rendered correctly and only the polygons that get missed.
While I realise there is probably some setting in cura responsible rather than
openscad and that I'm probably posting in the wrong place I just wondered if
anyone had an idea...
Ta SASA
On Tuesday 19 Jan 2016 22:15:34 Torsten Paul wrote:
On 01/19/2016 09:34 PM, superaorta@gmail.com wrote:
If anyone knows how I might parameterise this neatly so I could do
something like
for i=1:20
p(i)=[ include <points_$i.scad];
linear_extrude(height=10)polygon(p(i));
end
That would be great, but for now it works perfectly...
Add another dimension to the array and import into a single
variable?
ciao,
Torsten.
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
See what happens when you slice it with slic3r
On 21 January 2016 at 16:17, superaorta@gmail.com wrote:
I've developed another problem trying to do this that probably resides
outside
openscad but in case anyone is familiar with it here goes:
I generate my family of curves in openscad and and it looks fine - I
export the
curves as .stl and load into cura and it looks file, I then look at the
tool
path and some of the curves are missing. I suspect my feature size is a
bit
small but other smaller features produced using primitive shapes (cube)
always
get rendered correctly and only the polygons that get missed.
While I realise there is probably some setting in cura responsible rather
than
openscad and that I'm probably posting in the wrong place I just wondered
if
anyone had an idea...
Ta SASA
On Tuesday 19 Jan 2016 22:15:34 Torsten Paul wrote:
On 01/19/2016 09:34 PM, superaorta@gmail.com wrote:
If anyone knows how I might parameterise this neatly so I could do
something like
for i=1:20
p(i)=[ include <points_$i.scad];
linear_extrude(height=10)polygon(p(i));
end
That would be great, but for now it works perfectly...
Add another dimension to the array and import into a single
variable?
ciao,
Torsten.
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org