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[Noel Warren <>]

Thanks for the reply Sebastien.

I was unaware of that constructor.  Am I right in understanding that it only works with the Homogeneous kernel?  That's what I understand from the documentation.  The reason I ask is that all my code uses Exact_predicates_exact_constructions kernel.

The result not being simple is not a problem for me.  I itterate through the volumes creating new nefs for each one.

2013/2/20 Sebastien Loriot (GeometryFactory) <>

Hi Noel,

you got a self-intersection in design.off.

Using CGAL::OFF_to_nef_3 to create the nef polyhedron gave a result,
but then the difference is not simple.

Sebastien

On 02/20/2013 01:10 PM, Noel Warren wrote:

I get the following error when subtracting two Nef polyhedra

ERROR: CGAL ERROR: assertion violation!
Expr: itl != it->second.end()
File: /usr/local/include/CGAL/Nef_3/SNC_external_structure.h
Line: 1102

I have attatched the polyhedra in "off" format.  They convert fine to
Nef_polyhedron_3.  I have also tried the operation with the "Operations
on Polyhedra" demo.  Performing the difference operation (stock -
design) also crashes it.

Thanks in advance.

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