Earl,

First question, Is there a built in function to copy/paste a triangulation? 
> I want to copy and paste a mesh geometry around an axis. 
>
The copy constructor for Triangulation is deleted, but there is 
Triangulation::copy_triangulation(https://www.dealii.org/developer/doxygen/deal.II/classTriangulation.html#a1f2bf1d34aacdba358add7fd59b32822)
that can be used instead.
 

>
> Second question: Can merge_triangulations be used to merge more than 2 
> triangulations? I have a lot of Triangulations. :P 
>
In the current developer version there is an overload that takes 
arbitrarily many Triangulation objects 
(https://www.dealii.org/developer/doxygen/deal.II/namespaceGridGenerator.html#ab46ffffbea52fb08fbe2ddb21c0ea204).
 
Otherwise, you can just merge the Triangulation objects iteratively.

Best,
Daniel

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