> On Mar 30, 2016, at 7:39 AM, Daniel Roßberg <danielmrossb...@gmail.com> wrote:
>
> 2016-03-29 17:20 GMT+02:00 Christopher Sean Morrison <brl...@mac.com
> <mailto:brl...@mac.com>>:
>>
>>
>> The project can define a polygonal mesh structure that is compatible with
>> the STL format, which both OpenSCAD and BRL-CAD support. It's a simple and
>> limited format, but trivial to convert to/from. It is essentially an array
>> of floating point vertices and an array of faces with integer references
>> into the vertex array [*].
> [snip]
>> [*] This is essentially what BRL-CAD's BoT structure implements, but this
>> shared library could implement a simpler compatible structure.
>
> This would mean that the mesh healing function changes (somebody could
> say "destroys") the original mesh structure because the additional
> features of BoT, NMG and OpenSCAD get lost simply by converting the
> mesh back and forth, which is not optimal.
This is true. There can be a topological/connectivity/ordering change with a
simpler common structure. However, that by itself shouldn’t change the
geometry shape.
The alternative is picking something that directly reflects NMG or OpenSCAD’s
structure like you suggested, creating the same mesh conversion problem for the
other and anyone else not using that structure … unless they happen to all use
the more general radial-edge structure like Blender and BRL-CAD. :)
Inflicting that complexity on others seems somewhat cruel and unusual. Picking
something like half-edge means some meshes simply cannot be represented. Do we
know what OpenSCAD uses?
I can see it working either way myself, no attachment to and tradeoffs with
either approach. It’s worth noting that mesh healing will be changing the
topology/connectivity/ordering implicitly, so I wouldn’t think topology matters
much by the time someone is needing something healed.
Cheers!
Sean
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