Reference dimensions appear on models or in drawings for information only. Therefore, they are read-only and cannot be used to modify the model; however, they are automatically updated during regeneration if changes are made to the model. You can include reference dimension created between edges in Annotation features.

You can use reference dimensions in place of some relations. For example, instead of defining a side of a triangle with the relation

- you can use

Reference dimensions can be created in Part, Assembly, and Sketcher modes. They can also be created in Drawing mode, but only if you have a Detailed Drawings license.

Reference dimensions are distinguished from standard dimensions in either of the following ways:

The parameter symbol for reference dimensions is rd# (or rsd# in the case of Sketcher).