To Apply a Dimensional 3D Constraint

Select the Dimensional 3D Constraint tool (Drawing > Constraints > 3D > 3D Dimension).

Select a 3D element (solid or surface).

The selected 3D element is highlighted.

Select the face, edge or vertex of the 3D element you want to constrain (reset if a face (or entity) is behind another face (or entity) until the desired one is selected).

The selected face, edge or vertex is highlighted.

Select another 3D element and then select the desired face, edge or vertex of this 3D element.

The distance between the selected entities is displayed.

5. (Optional) Select New Variable or New Expression if you wish to create a new variable or expression to use or select any desired variable displayed in the drop-down menu.

6. Enter a data point to accept the displayed distance or key-in desired value to constrain. Constraint is applied to the element.

Note: If a new variable or expression is created and applied, the properties of the newly created variable or expression will be displayed in the Variables Dialog.