nop.head at gmail.com
Wed Sep 5 10:51:09 EDT 2018
Or manifold STL files with vertices closer than the OpenSCAD grid. They
actually become non-manifold during import.
On 5 September 2018 at 15:46, Ed Nisley <ed.nisley at pobox.com> wrote:
> On 09/04/2018 09:02 PM, FourthDr wrote:
>> They both look and preview fine.
> Meshlab shows both have the usual assortment of mesh errors and are
> non-manifold: hot death on a stick for further operations.
> My (admittedly limited) experience with automatic mesh repair suggests the
> algorithms generally make the choices I expect, but sometimes produce
> weirdly shaped patches, if not completely bizarre shapes, around the
> non-manifold geometry. The fact a "repaired" STL file still contains
> geometry errors shows the automation doesn't always get it right.
> Agreed, OpenSCAD shouldn't fall over dead when handed a broken STL file,
> but AFAICT the explosion happens deep in the CGAL machinery where it's out
> of anyone's control. The only defense seems to be not handing it
> non-manifold models.
> Which rules out many attractive STLs scattered around the Interwebs ...
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