Re: [Libmesh-users] Elements sharing common vertex/edge

[Stogner, R. H <roy...@ic...>]

On Wed, 25 Dec 2019, Amneet Bhalla wrote:

> I am working with triangulated surfaces in 3D, and I need to:
>
> 1) Calculate angle-weighted normals at the vertex points, and
>
> 2) Calculate average of normals of two triangles sharing an edge.
>
> For both cases, I think I would need to know all elements sharing a common
> vertex, and two elements sharing a common edge, respectively. Can this
> information extracted from libMesh?

For (1) the answer can be *no* in the case of a distributed mesh with
default ghosting, but if you use a replicated mesh or you have a
ghosting functor that includes point neighbors then you can use
Elem::find_point_neighbors().

For (2) you just use Elem::neighbor_ptr().
---
Roy