petsc-3.7.5 2017-01-01

DMPlexSetAdjacencyUseCone

Define adjacency in the mesh using either the cone or the support first

#include "petscdmplex.h"   
#include "petscdmlabel.h"  
PetscErrorCode DMPlexSetAdjacencyUseCone(DM dm, PetscBool useCone)

	dm	- The DM object
	useCone	- Flag to use the cone first

    FEM:   Two points p and q are adjacent if q \in closure(star(p)),   useCone = PETSC_FALSE, useClosure = PETSC_TRUE

    FVM:   Two points p and q are adjacent if q \in support(p+cone(p)), useCone = PETSC_TRUE,  useClosure = PETSC_FALSE

    FVM++: Two points p and q are adjacent if q \in star(closure(p)),   useCone = PETSC_TRUE,  useClosure = PETSC_TRUE