petsc-3.8.4 2018-03-24

DMPlexCreateSubmesh

Extract a hypersurface from the mesh using vertices defined by a label

#include "petscdmplex.h"    
#include "petscdmlabel.h"   
PetscErrorCode DMPlexCreateSubmesh(DM dm, DMLabel vertexLabel, PetscInt value, DM *subdm)

	dm	- The original mesh
	vertexLabel	- The DMLabel marking vertices contained in the surface
	value	- The label value to use

subdm -The surface mesh

Note: This function produces a DMLabel mapping original points in the submesh to their depth. This can be obtained using DMPlexGetSubpointMap().