# Chain Dimension
Mark a chain of dimensions on a 3D model. The dimensions marked by the command are placed in View Panel - Dimensions.
Main functions and mode of operation：
- Click on the "Size Chain"
to bring up the dialog box.
Annotation elements: You can select points and lines; After selecting an element as an annotated element of the dimension chain 0 size,Choose the other labeling elements again.
The remaining parameters are set with the diagram-scale chain.
Click on the drawing of the completion of the three-dimensional annotation, three-dimensional annotation was selected highlight, pop-up dialog box, you can enter Lines should be re-edited; Drag the mouse to change the position in the plane where the annotation is located.
Example: The following view activates a block chain, and the effect is as follows.
