CGAL users discussion list

["J. Scheurich" <>]

> Your inputs are now triangle surface meshes, good, but they are
> strongly self-intersected. It is a documented pre-condition for
> refinement that both input are not self-intersecting and are bounding
> a volume. 
> And They must be 2-manifold. It means for example that you cannot
> consider 2 cubes glued together into one mesh, you need to remove the
> internal face so that an edge only has 2 faces attached to it. Here,
> at several places in reduced1.off, there are sorts of internal panels
> separating the volume. This is probably the problem that triggers your
> current assertion.
>
Strange, a similar dataset was working in past in Ubuntu 18.04 LTS

https://www.pro-linux.de/artikel/2/image/1991/15549,bild-16-boolean-operationen.html
https://www.pro-linux.de/artikel/2/image/1991/15550,bild-17-boolean-operationen.html

so long
MUFTI