Re: Importing a DXF containing arcs and circles
On 8/17/2023 11:46 AM, jpm2nice-tech--- via Discuss wrote:
I also use AutoCAD to create my DXFs. But during importation, the arcs
are converted to segments.
Then I read in the documentation (sorry, I forgot where) that this
isreally a limitation.
Ah!
OpenSCAD supports importing DXF arcs and circles.
But OpenSCAD does not itself support arcs, circles, or other curves. It
supports only polygons and polyhedra.
Everything that looks like a curve, including the native circle, sphere,
cylinder, and rotate_extrude modules, and any others I'm forgetting,
turns into straight lines. Maybe lots of straight lines, but if you
look close enough they are always there.
If you eventually use your .scad files for 3D printing, there is an open
source tool, ArcWelder https://github.com/FormerLurker/ArcWelderLib, that
will pre-process the gcode files and turn the sequence of short segments
back into proper arcs, for 3D printers that support arcs in their gcode.
On Thu, Aug 17, 2023 at 1:48 PM Jordan Brown openscad@jordan.maileater.net
wrote:
On 8/17/2023 11:46 AM, jpm2nice-tech--- via Discuss wrote:
I also use AutoCAD to create my DXFs. But during importation, the arcs are
converted to segments.
Then I read in the documentation (sorry, I forgot where) that this
isreally a limitation.
Ah!
OpenSCAD supports importing DXF arcs and circles.
But OpenSCAD does not itself support arcs, circles, or other curves. It
supports only polygons and polyhedra.
Everything that looks like a curve, including the native circle, sphere,
cylinder, and rotate_extrude modules, and any others I'm forgetting, turns
into straight lines. Maybe lots of straight lines, but if you look close
enough they are always there.
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It has been a while, but I remember that OpenSCAD seemed to have issues
with splines and bezier curves.
Accordingly, if you use R12 formats for DXF files, your CAD s/w would
likely convert those splines and beizer curves into polylines, and those
can be imported into OpenSCAD.
There is also a well developed python ezdxf app/library
https://github.com/mozman/ezdxf/tree/master
https://ezdxf.readthedocs.io/en/stable/index.html
I've not played much with that, but that it has an r12 writer addon
https://ezdxf.readthedocs.io/en/stable/addons/r12writer.html
I'm not too sure if that can be used to convert files from formats later
than R12 into R12 formats which would likely import with less troubles
than the later DXF formats.
On 18/08/2023 05:10, David Phillip Oster wrote:
If you eventually use your .scad files for 3D printing, there is an
open source tool, ArcWelder
https://github.com/FormerLurker/ArcWelderLib, that will pre-process
the gcode files and turn the sequence of short segments back into
proper arcs, for 3D printers that support arcs in their gcode.
On Thu, Aug 17, 2023 at 1:48 PM Jordan Brown
<openscad@jordan.maileater.net mailto:openscad@jordan.maileater.net>
wrote:
On 8/17/2023 11:46 AM, jpm2nice-tech--- via Discuss wrote:
I also use AutoCAD to create my DXFs. But during importation, the
arcs are converted to segments.
Then I read in the documentation (sorry, I forgot where) that
this isreally a limitation.
Ah!
OpenSCAD supports importing DXF arcs and circles.
But OpenSCAD does not itself support arcs, circles, or other
curves. It supports only polygons and polyhedra.
Everything that looks like a curve, including the native circle,
sphere, cylinder, and rotate_extrude modules, and any others I'm
forgetting, turns into straight lines. Maybe lots of straight
lines, but if you look close enough they are always there.
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