Cell_Set
Synopsis
Holds cell-based data for all cells of the same type in a mesh.
group Cell_Set {
int ncells; /* number of cells */
int cell_ndim; /* cell dimensionality */
int cell_nnodes; /* number of nodes per cell */
int cell_corner_nnodes => cell_nnodes; /* corner nodes per cell */
int cell_order; /* cells' order */
int poly_flag; /* flag used for polylines, polytriangles */
int node_connect_list[ncells*cell_nnodes]; /* node connectivity array */
string+opt name; /* user supplied string to name cell set */
int+opt nprops;
float+opt props[nprops];
};
Description
The Cell_Set holds all of the non-coordinate, non-data information for all cells of the same type (Point, Line, Polyline, Tri, Polytri, Quad, Tet, Hex, Pyr, or Prism, and so on) within an unstructured mesh.
This basic Cell_Set definition must be qualified with the information specific to each cell type before it can be used. See the individual headings for the cell types.
To get/set one entire cell_set see FLDget_cell_set
Parameters
ncells
An integer that sets the total number of cells in the Cell_Set.
FLDget_ncells
cell_ndim
An integer that sets the dimensionality of this type of cell. This is usually set by the Point, Line, Tri, Quad, and so on, groups.
Dimensionality
|
Cell types
|
0
|
Point
|
1
|
Line, Line2, Polyline
|
2
|
Tri, Tri2, Polytri, Quad, Quad2
|
3
|
Tet, Tet2, Hex, Hex2, Pyr, Pyr2, Prism, Prism2
|
FLDget_cell_ndim
cell_nnodes
An integer that sets how many nodes make up the cell. This is usually established by the specific Point, Quad, Pyr, and so on, groups. Values range from 0 for Point, 2 for Line, 3 for Line2, up to 8 for Hex, and 20 for Hex2 (hexahedral cell with mid-edge nodes).
cell_corner_nnodes=>cell_nnodes
An integer that sets how many corner nodes this type of cell has. For single order cells, cell_corner_nnodes => cell_nnodes, hence that is the definition here. Higher order cells (with mid-edge nodes) will override this setting with their own correct value.
cell_order
An integer that sets the cell order. cell_order = 1 is a cell with nodes at its corners only cell_order = 2 is a cell with mid-edge nodes. This is usually established by the specific Quad, Quad2, Hex, Hex2, and so on, groups.
There is no FLD library call to get/set this value.
poly_flag
A flag that, when not 0, signals the renderer that this is an unstructured mesh representing a geometry (Polyline, Polytri). The renderer can use faster algorithms to render the object.
node_connect_list[ncells * cell_nnodes]
An integer array. Cells are not independent entities existing in close formation in space. Rather, each cell is connected to another cell; it shares the nodes on its face with the adjacent cell. The node_connect_list is an array that, for each cell (ncells) states which nodes belong to that cell. This is the node connectivity list.
name
A string. Allows users to assign an arbitrary name to the Cell_Set. Note that this is different from the cell_name subobject defined within each cell type to name that cell type (Tri, Quad2, and so on).
nprops
An integer. Allows for users to assign an arbitrary number of Cell_Set properties such as thickness, material, and so on.
props[nprops]
A float array, nprops long. Stores the user-defined properties.
FLDget_cell_propsThere are more subobjects that can be associated with a Cell_Set. These are added to the basic Cell_Set definition by the individual cell type groups. See the reference pages for the individual cell types. For example:
Files
v/fld.v.
See Also
