Geometry > Geometry Object Information > Adjacency
Adjacency
The following geometry adjacency information methods are available:
Table 3-21: Geometry Adjacency Information Methods
method
1D
2d
3d
output type
3.5a name
getStartEnd()
√
√
√
int[2][]
se,flgeomse
getUpDown()
√
√
√
int[2][]
ud,flgeomud
getUpDownExt()
√
√
√
int[2][]
 
getVertexDomain()
 
√
√
int[]
sd,flgeomsd
getSD()
 
√
√
double[]
sd,flgeomsd
getAdj(int,int)
√
√
√
int[][]
adj, flgeomadj
getAdj(int,int,int)
√
√
√
int[]
adj, flgeomadj
getAdjOrient(int,int)
√
√
√
int[][]
adj, flgeomadj
getAdjOrient(int,int,int)
√
√
√
int[][]
adj, flgeomadj
getAdjSparse(int,int)
√
√
√
int[3][]
adj, flgeomadj
•
getStartEnd returns the start and end vertices of all edges in the first and second row of the returned matrix.
•
getUpDown returns the up and down domain number for all boundaries in the first and second row of the returned matrix. All void regions have the domain number 0.
•
getUpDownExt returns the up and down domain number for all boundaries in the first and second row of the returned matrix, using an extended domain numbering where void regions have different domain numbers. The infinite void region has domain number 0. The finite void regions have negative domain numbers. However, if voidAreLabeled() returns false, the extended domain numbering is not available, and then all void regions have domain number 0.
•
getVertexDomain returns the domain index for each vertex. For non-isolated vertices, the domain index is -1.
•
getSD returns the domain index for each vertex. For non-isolated vertices, the domain index is NaN.
•
a = getAdj(fromDim, toDim) returns a matrix where a[fromIdx]=getAdj(fromDim,toDim,fromIdx) contains the entities in dimension toDim that are adjacent to entity fromIdx in dimension fromDim.
•
ao = getAdjOrient(fromDim, toDim) returns a matrix where ao[fromIdx]=getAdjOrient(fromDim,toDim,fromIdx) contains the orientation flag for the entities in getAdj(fromDim,toDim,fromIdx). The orientation flag is 1 if the adjacent entities have the same orientation, and -1 if they have the opposite orientation, and 2 if the relative orientation cannot be determined (for instance, for an edge interior to a face).
•
as = getAdjSparse(fromDim, toDim) returns the adjacency matrix from entities in dimension fromDim to entities in dimension toDim on a sparse format, that is, as[0] are the entity numbers in dimension fromDim, as[1] are the entity numbers in dimension toDim, and as[2] are the corresponding orientation flags.