About Groups, Selections Sets and Layers

Groups and selections sets can me mapped at import and export.

This page discusses:

Import of Groups

In the IGES Norm, the Group Associativity is mapped with the type 402 (Associativity Instance Entity).

The import of groups as selection sets can be activated or de-activated in the IGES section of the Preferences.

Note: Mapping group associativities to selection set is time consuming.

This applies to the four following form numbers that specify group associativities:

FormMeaning
1Unordered group with back pointers
7Unordered group without back pointers
14Ordered group with back pointers
15Ordered group without back pointers

A selection set is created for each Group Associativity pointing to a list of entites in the IGES file.

  • This selection set is named with the name of the pointed group entity.
  • The selection set contains all the pointed entities.
  • A selection set pointing to another selection set cannot be greated.
  • When a group is pointed by a second group, the entities of the first group will be pointed by a first selection set (mapping the first group) and by a second selection set mapping the second group (including others entities of the second group).
  • Only logically dependant IGES entities (Status Number 3-4 = "02" in D.E. section) can be mapped in a selection set.
  • The selection sets cannot be created when the Import as a Product Structure option is selected.

Layers

Layers can be imported and exported.

At Import

  • If the IGES file contains a layer 10000, this layer is translated into layer None.
  • A layer with a name greater or equal to 1000 is translated into a layer named with the last three digits, e.g. layer 3250 is translated into layer 250.

At Export

None is translated into layer 10000 in the IGES file.