Roles
In EX3, the Role is defined as the Entity type. Note that Geometry entities can have the following three types of roles. They can all be modified or used to modify other geometry entities with some distinctions (see Geometry section for more details on modifying geometry). The three types of roles are:
Construction: Will not be included in the External volume or be meshed.
Excavation: Can be part of the External volume that is meshed.
Geology: Can be part of the External volume that is meshed.