To select criteria for clash detection operation

The Criteria tab of the Clash Detection dialog is used to set up the criteria to determine whether there is a clash. There are three types of criteria from which to choose: Levels, References, and Item Sets/Named Groups. The criteria displayed in the three list boxes include items found in the reviewed file and any direct attachments to the reviewed file.

Any geometry that is hidden in the view is not included in the clash detection. For example, if a level is turned off in the view, geometry on that level will not be included in the clash detection even if you have selected that level as a criteria for Set A and Set B.

If you want to select an item that is in a deeply nested attachment, you need to use the key-in CLASHDETECTION SETA ADD LEVEL <level>, for example, if you want to add a level to Set A.

The criteria from any of the panels on the Criteria tab can be dragged into either the Set A or Set B list box. You can also select the level, reference, item set or named group, right-click and select Copy and then paste it into the appropriate set list box.

If you only want to check one set of objects against itself, add these items to the Set A or Set B list box and turn on the Self Check option.

Note: Although you cannot add specific nested references to Set A and Set B, you can add them using the key-ins CLASHDETECTION SETA ADD REFERENCE "ModelDisplayName" and CLASHDETECTION SETB ADD REFERENCE "ModelDisplayName". The ModelDisplayName is a quoted string consisting of the logical name (if there is any), followed by the file name, followed by the model name (if there is more than one model in the file). An example is "GFElectric_left,Electrical.dgn.idgn,Default," where the default model is referenced from the file Electrical.dgn.idgn and GFElectric_left is the logical name for the attachment. The name is typed with no spaces after the commas.

In the Clash Detection dialog job list, select the job whose criteria you want to create.
Select the Criteria tab.
From the Criteria tab, drag into the Set A and Set B list boxes, any levels, references, item sets, or named groups of the objects to include in the clash detection.