DMPlexMarkBoundaryFaces#

Mark all faces on the boundary

Synopsis#

#include "petscdmplex.h"    
#include "petscdmlabel.h"   
PetscErrorCode DMPlexMarkBoundaryFaces(DM dm, PetscInt val, DMLabel label)

Collective

Input Parameters#

dm - The original DM
val - The marker value, or PETSC_DETERMINE to use some value in the closure (or 1 if none are found)

Output Parameter#

label - The DMLabel marking boundary faces with the given value

Note#

This function will use the point PetscSF from the input DM and the ownership of the support cells to exclude points on the partition boundary from being marked. If you also wish to mark the partition boundary, you can use DMSetPointSF() to temporarily set it to NULL, and then reset it to the original object after the call.

In DMForest there can be facets support sizes of which alone can not determine whether they are on the boundary. Currently, this function is not guaranteed to produce the correct result in such case.