Hey, Robert,
I very much appreciate your effort to help me. I have tried using FreeCAD
for this purpose.
It is, however, dependent on OCC, which runs an algorithm that is not
satisfactory for my
application (as you can see on the example - the tessellation is far from
smooth, and
when you increase the tessellation precision, the file gets unacceptably
large, compared
to commercial software, like Autodesk Fusion 360).
This is why I tried BRL-CAD, which is even more mature than OCC. I may be
able
to add a patch for BRL-CAD for tessellating NURBSs, but I will have to do
more
research before that
Thank you for your help,
Filip
On Wed, Jul 26, 2017 at 5:00 PM, Bob Anderson <bob.ander...@survice.com>
wrote:
> 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>
> 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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