[OpenSCAD] GROUP vs UNION

Gordon Wrigley gordon.wrigley at gmail.com
Wed Feb 8 01:44:46 CET 2012


Basically that the mesh represents a physical object, so no holes, no
intersecting bits and weird stuff like an edge that's shared by 3 triangles.

On Wed, Feb 8, 2012 at 11:42 AM, Don Bright <hugh.m.bright at gmail.com> wrote:

> what does manifold mean?
>
> On Tue, Feb 7, 2012 at 6:27 PM, Triffid Hunter <triffid.hunter at gmail.com>
> wrote:
> > On Wed, Feb 8, 2012 at 11:13 AM, Alan Cox <alan at lxorguk.ukuu.org.uk>
> wrote:
> >>
> >> On Tue, 7 Feb 2012 23:57:38 +0000
> >> nop head <nop.head at gmail.com> wrote:
> >>
> >> > Are overlapping shells allowed in an STL? Surely that is one of the
> >> > non-manifold things that upsets slicers.
> >>
> >> 3D printers might not like it but I don't see why STL doesn't allow it
> >
> >
> > STL will allow anything, it's simply a list of triangles in 3d space.
> >
> > That's one of the troubles our slicers have, there's no requirement for
> > manifoldness.
> >
> > I'm also curious as to what possible use you could have for deliberately
> > creating a self-intersecting non-manifold object?
> >
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