[OpenSCAD] openscad-2011.05.10 exports non-manifold STLs

Marius Kintel marius at kintel.net
Wed Aug 3 00:10:10 CEST 2011

On Aug 2, 2011, at 23:53 PM, Tony Buser wrote:

> Does this error "ERROR: Illegal polygonal object - make sure all
> polygons are defined with the same winding order." mean that it is non-manifold or is this a catch-all error for any number of problems?

It's a catch-all for the CGAL error "illegal polygonal object", which historically often has been caused by winding order issues (typically for manually specified polygons).

Now that people tend to import STL files to e.g. do mashups, the winding order might not be the top culprit anymore.
It might be possible to do some digging and get a better error message.

It might also be that CGAL is a far from ideal tool to deal with mashup-type modeling ;)


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