[OpenSCAD] Origami ship has Manifold problem

doug moen doug at moens.org
Sun Apr 26 12:43:54 EDT 2015

If I render the unioned spheres script,

rotate([0,40,0]) sphere(20);

then export as STL,
then import the STL into another model,


and render, then I get this error message:

Rendering Polygon Mesh using CGAL...

CGAL error in CGAL_Build_PolySet: CGAL ERROR: assertion violation!

Expr: check_protocoll == 0

File: /opt/local/include/CGAL/Polyhedron_incremental_builder_3.h

Line: 199

That's not good, right? OpenSCAD shouldn't write STL files that it can't

On 26 April 2015 at 06:10, kitwallace <kit.wallace at gmail.com> wrote:

> I think the problem boils down to unioned spheres at different angles
> sphere(20);
> rotate([0,40,0]) sphere(20);
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