Here is an example of the Python script to automate this from FreeCAD’s website
(https://forum.freecadweb.org/viewtopic.php?t=13833) …
from PySide import QtCore
import Part, Mesh
d=QtCore.QDir("Directory_to_step_files")
d.setNameFilters(["*.step", "*.stp"])
files = d.entryInfoList()
for i in files:
shape = Part.Shape()
shape.read(i.absoluteFilePath())
mesh = Mesh.Mesh()
mesh.addFacets(shape.tessellate(0.01))
mesh.write(i.absolutePath()+"/"+i.baseName()+".stl"
Robert Anderson
From: Filip Binkiewicz [mailto:fi...@3dhubs.com]
Sent: Wednesday, July 26, 2017 9:32 AM
To: BRL-CAD Users Mailing List <brlcad-users@lists.sourceforge.net>
Subject: Re: [brlcad-users] Hey, I'm trying to convert a STEP file into an STL
triangle mesh, and BRL-CAD seems to be the perfect match for this task. I am
having trouble achieving it, however. Here's what I do I take any model, let's
say this one: https://raw....
Hello, Sean,
thanks for the news. When can I expect support for NURBS tesselation?
Also, you mentioned that this isn't yet exposed - does this mean it is
implemented?
Is there a way to expose it in my local fork and if there is, where should I
start looking?
Cheers,
Filip
On Wed, Jul 26, 2017 at 3:00 PM, Christopher Sean Morrison
<brl...@mac.com<mailto:brl...@mac.com>> wrote:
Hi Filip,
You’re not doing anything wrong. You ran into an unimplemented feature.
> Now, when I try to produce an STL file, I get an error:
> $ ./BRL-CAD_7.26.0_Linux_x86_64/bin/g-stl -o aube_pleine.stl aube_pleine.g
> Assembly1
> ERROR(Brep_2.s): tessellation failure
> 0 triangles written
>
> I don't know how to handle this, as I am quite new to BRL-CAD - I would
> appreciate some insight
>
When you imported the STEP file, it contained a NURBS boundary representation
(brep) entity. Support for converting NURBS into triangles (i.e.,
tessellation) isn’t yet exposed as a feature, so the export reports a failure.
There is code that turns the NURBS into triangles for display, but I don’t
think there’s a way to get at those triangles just yet as a user. To any devs
interested in implementing this, look near the WATER_TIGHT define in
src/librt/primitives/brep/brep.cpp. Sorry I don’t have better news Filip.
Cheers!
Sean
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