CGAL users discussion list

[Iason Manolas <>]

That was quick! Thanks for your prompt reply.

boost::make_assoc_property_map(normals) was missing. It converts to an Lvalue Property Map which provides the operator[] which is need in the put function that was throwing the previously mentioned error (?) .

Best Regards,

Iason

On 1 November 2016 at 10:50, Andreas Fabri <> wrote:

Hello,

I just added an example:
https://github.com/CGAL/cgal/pull/1638

Best,

Andreas

On 31/10/2016 12:46, Iason Manolas wrote:

Hi,

I am new to CGAL. I have constructed a CGAL::Polyhedron_3 and now I want
to compute the normal vector for each of its vertices. So I found the
Polygon Mesh Processing package which happens to have a function
<http://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__normal__grp.html#gad46aaf003999b2939f3f9e4f6fa58d0e>
doing exactly what I want . In the above link I found out that the
second argument was of type  VertexNormalMap which is a model of
WritablePropertyMap. There was a link
<http://www.boost.org/doc/libs/1_62_0/libs/property_map/doc/WritablePropertyMap.html>
to boost libraries explaining(?) what writable property map is .

Unfortunately this is my first encounter with property maps and
consequently I am a bit confused..
I also had a look at cgal's explanation of property maps page
<http://doc.cgal.org/latest/Property_map/index.html >, but I did not
understand much..

Could anyone suggest a way of creating the property map I need?

Best Regards,
Iason

--
Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project

phone: +33.492.954.912    skype: andreas.fabri

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