CGAL users discussion list

[Guillaume Damiand <>]

Hi Ali;


Le 06/10/2020 à 15:34, AliiAsgharii a écrit :
> Hi all,
> Using Nef_3 library, I have recently noticed that it is not possible to draw
> a non-2-manifold object with OFF format by draw_nef_3. I have tried to draw
> the following object (two cubes with one shared edge) but nothing showed.
> <http://cgal-discuss.949826.n4.nabble.com/file/t376202/Capture.jpg>
>
> Could CGAL enable us to draw and visualise this type of objects? Are there
> any solutions for handling this situation in CGAL?

You can visualize a non manifold object using Nef_3 and the draw function.

But a Nef_3 object can not be created from a non manifold off (cf doc 
here https://doc.cgal.org/latest/Nef_3/index.html#title8).

One possible solution is to split your object in several off files, each 
one being an oriented closed 2-manifold.
Then you can load each off into one Nef_3 object, and merge all the 
objects in one Nef_3 using for example the Nef_nary_union_3 class (cf. 
https://doc.cgal.org/latest/Nef_3/classCGAL_1_1Nef__nary__union__3.html).

Best
Guillaume

PS: Attached a snapshot of the draw, using two cubes from two different 
off files.

> Best regards,
> Ali
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/


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Guillaume DAMIAND

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