Building Materials Are Generated and Assigned Automatically
When opening an earlier-version file in ArchiCAD 17, the program automatically creates the required Building Materials and assigns them to all elements to maintain the model’s original graphical appearance in all model views.
The migration algorithm searches through all of the project’s model elements, defaults, favorites, unused composites/profiles, etc., with their Priorities, Cut Fill, Fill Orientation, Surfaces and Pen settings.
Where the settings are identical, a new Building Material is generated. (Variations in Cut Fill Pen and Surfaces are handled as element-level overrides, to minimize the number of newly created attributes.)
The names of the new Building Materials are generated from the original Cut Fill’s name and will be extended with a unique nine-digit identifier (explained later, under Working with Hotlinks: What Happens to the Attributes).
This automatic generation is the best that can be created via the model analysis process when opening older files in ArchiCAD 17. This process results in a true representation of the settings used within the project, because it checks all elements in the model and creates all the necessary Building Materials. However, since the Building Material introduces a new logic into ArchiCAD, the generated set of attributes should be reviewed and finalized by the user.
See later section to follow: What to Do About Attributes in a Migrated Project.