These commands are advised for expert users only.
This suite of commands creates and handles the lower dimension structures associated with a mesh. The existing mesh is labeled ‘d0’. The next lower dimension mesh ‘d1’ and so on. For an original 3D mesh, the d1 structures are the surfaces (2D) separating material regions, the d2 structures are the lines separating the d1 surfaces and the d3 structures are the nodes at the ends of the d2 lines.
## SYNTAX
lower_d / filter / [cmo_name] /[iclr1 itp imt ] / value [ and or new ]
create lower_d structures in mesh object
lower_d / create/ [cmo_name]
release lower_d structures
lower_d / release/ [cmo_name]
create lower_d structures into named mesh objects cmo1, cmo2, cmo3
lower_d / extract/ [cmo_name/cmo1/cmo2/cmo2]
Several new attributes are created which belong the original mesh object:
| name | type | length |
|---|---|---|
| d0_nnodes_topo | VINT, nnodes | 0 = interior, 1 = surface, node 2 = line node, 3 = line end node |
| d1_nnodes | INT, scalar | number of nodes in this structure |
| d1_elements | INT, scalar | number of elements in this structure |
| d1_nef_cmo | INT, scalar | number of facets/element in this structure |
| d1_nee_cmo | INT, scalar | number of edges/element in this structure |
| d1_nen_cmo | INT, scalar | number of nodes/element in this structure |
| d1_jtet_cycle_max | INT, scalar | the longest jtet cycle in this structure |
| d1_itettyp | VINT d1_elements | element type |
| d1_itetclr | VINT d1_elements | element selection number |
| d1_itet off | VINT d1_elements | offset to d1_itet |
| d1_jtet off | VINT d1_elements | offset to d1_jtet |
| d1_itet | VINT d1_elements | list of nodes for each xd1_neu_cmo element |
| d1_jtet | VINT d1_elements | list of face neighbors xd1_nef_cmo |
| d1_elm_d0 | VINT d1_elements | elements face # in original mesh that this element came from |
| d2_nnodes | INT, scalar | number of nodes in this structure |
| d2_elements | INT, scalar | number of elements in this structure |
| d2_nef_cmo | INT, scalar | number of facets/element in this structure |
| d2_nee_cmo | INT, scalar | number of edges/element in this structure |
| d3_nen_cmo | INT, scalar | number of nodes/element in this structure |
| d2_jtet_cycle_max | INT, scalar | the longest jtet cycle in this structure |
| d2_itettyp | VINT d2_elements | element type |
| d2_itetclr | VINT d2_elements | element material number |
| d2_itet off | VINT d2_elements | offset to d2_itet |
| d2_jtet off | VINT d2_elements | offset to d2_jtet |
| d2_itet | VINT d2_elements | list of nodes for each xd2_neu_cmo element |
| d2_jtet | VINT d2_elements | list of face neighbors xd2_nef_cmo |
| d2_elm_d1 | VINT d2_elements | element & face that this element came from in next higher level structure |
| d3_nnodes | INT, scalar | number of nodes in this structure |
| lower_d_flag | INT, scalar | 0= no lower d structure exist =1 lower_d structures exist and are valid =2 lower_d structures not valid |
The above set of attributes are created if the original mesh is 3D. If the original mesh is 2D then the d1 structures are created, but the d2 structures are simply the d2_nnodes. If the original mesh is 1D, then only the d1_nnodes structure is created.
At the time the lower_d structures are created color table attributes: d0_clrtab, d0_nclrs, .. are also created.