# Types for Corners and T-Joints

In the HRB system, up to and including version 18.02, corners and T-joints were uniquely defined by the combination of wall types and the geometric situation (e.g., interior right-angled, etc.). For each combination there was accordingly only one setting. However, if the same walls in the same geometric situation were constructed differently due to special rules (e.g., corner windows, T-joints on element joints, etc.), this was only possible with cumbersome *free ends* options. Since version 19.01, types can also be defined for all corners and T-joints:

### HRB Editor

* Double-clicking on 4.\_Wall ends or 5.\_T-joints opens the dialog for entering the descriptive texts for the types.

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* The respective text is used for the corresponding number in all situations. For example, if the text *special* is assigned here for corner type 3, then for type 3 in all corners the text *special* is displayed.

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* Double-clicking on the situation (e.g., Interior Right-Angled / Rear) opens the dialog box for managing the settings for that situation.

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* An additional column has now been added here. There you can select the type number. After it, the descriptive text for that type number is displayed.
* Until now, only one setting could be defined for each combination of walls (e.g., current lead-on to - (current lead-on)). Now you can create any number of settings. Each of the settings with the same combination of wall types must have a different type number.
* When a new setting is created, the system automatically assigns the next available type number for that combination of wall types. You can change the type number afterwards; however, each type number will be accepted only once for each combination.

### Structure

* In the wall attributes, the entries for left and right wall ends have now been separated:\
  In the first drop-down list the type of wall end is determined: *(automatic), cutting, cut, T-joint, element joint, free end*.\
  In the second drop-down list, a type number can then be selected depending on that. The descriptive texts from the currently linked HRB file are displayed after the type numbers.
* If a wall end is set to 'cutting' or 'cut' with a type number, the end of the partner wall is correspondingly set to 'cut' or 'cutting' with the same type number.
* For T-joints, the type number can only be specified for the abutting wall.
