Re: [Libmesh-users] Defining hanging nodes in the XDA format

[Roy S. <roy...@ic...>]

On Thu, 25 Jan 2018, Salazar De Troya, Miguel wrote:

> An easier question to make would be: Can I have a parent element
> with just two children?

Ah!  I'm not sure if this was an easier question to make, but it's a
*much* easier question to answer: no.

The last time I tried counting, we had literally more than a hundred
places where libMesh core library code made the core assumption that
any hierarchical refinement was done isotropically.  IIRC there are
even many places in the code that make the assumption that the
refinement pattern within each parent element of a hierarchic mesh
matches one of the few refinement patterns which libMesh creates
itself.

It's something we'd all love to change; anisotropic AMR is nice.  But
I don't see it changing any time soon.
---
Roy