Assignment of regions: about
Assignment of regions
The process of regrouping the geometric entities is called assignment of regions.
Regions are assigned to geometric entities, and the geometric entities belong to regions, as summarized in the table below.
| Region types … | entities … | |
|---|---|---|
| point | are assigned to → ← belong to |
points |
| line | lines | |
| face | faces | |
| volume | volumes | |
2D / 3D studies specificity
In a 2D study:
- all the faces belong to face regions
- only some lines (and/or points) belong to line regions (and/or point region)
In a 3D study:
- all the volumes belong to volume regions
- only some faces (and/or lines) belong to surface regions (and/or line regions)
Operation modes
Before describing the operation modes, it is interesting to note that the user will not proceed obligatory in the same way for the:
- obligatory assignments:
- all faces in 2D,
- all volumes in 3D
- optional assignments:
- some lines or points in 2D
- some faces or lines in 3D
That is why two operation modes are proposed: the completion mode and the modification mode, described in the table below.
|
2D study |
||
|---|---|---|
| The mode… | is used to assign… | to... |
| completion | groups of faces | surface regions |
| modification |
some faces some lines some points |
surface regions line regions point regions |
|
3D study |
||
|---|---|---|
| The mode… | is used to assign… | to... |
| completion | groups of volumes | volume regions |
| modification |
some volumes some faces some lines |
volume regions surface regions line regions |
Completion mode: specificity
In completion mode the entities are made invisible in the graphic area during the assignment, which allows a fast and effective assignment of the groups of faces (in 2D), and groups of volumes (in 3D).