[OpenSCAD] Discuss manifoldness, co-incident faces edges etc

nop head nop.head at gmail.com
Wed Nov 13 16:17:53 EST 2019


Why does is it a contradiction? A polygon mesh represents geometry and by
finding which facets share edges it is unambiguous, so the topology of the
geometry is preserved as long as it is manifold. For non manifold geometry
you need a more complex data structure because edges can no longer be
paired up unambiguously.

On Wed, 13 Nov 2019 at 21:01, Carsten Arnholm <arnholm at arnholm.org> wrote:

> On 13.11.2019 21:39, nop head wrote:
> > There is no explicit topology but it is preserved.
>
> This statement contradicts itself.
>
>  > Once read into OpenSCAD all explicit topology is lost anyway because
>  > it uses a polygon soup itself.
>
> The obvious suggestion is to fix that for file formats with explicit
> topology.
>
> Carsten Arnholm
>
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