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.githubusercontent.com/floatingpointstack/aoc-xchange/master/examples/models_in/step/aube_pleine.stp I transform it to .g, like this: $ ./BRL-CAD_7.26.0_Linux_x86_64/bin/step-g -o aube_pleine.g aube_pleine.stp This works fine. Now, I find the name of the part I want to export: $ ./BRL-CAD_7.26.0_Linux_x86_64/bin/mged aube_pleine.g tops Assembly1/ 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

[Filip Binkiewicz]

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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