Edge elements of a character rig (shown with the silhouette of the character)
By default, they cannot be selected by the user. This can be adjusted using the Selectable menu.
An Edge has a number of properties specific to it. These properties can be viewed and adjusted in the Property Editor, under the View Edge tab.
First object and Second object
Links to two Point Controllers that are connected by this edge.
These parameters can be used to quickly find corresponding controllers on the Outliner window (to do this, click the looking glass icon near the name of a controller).
This is the default length of an edge. It does not change when controllers are moved.
Edges also act as indicators of length distortion. By default, the length of an edge is constant. When it changes (this might happen during adjusting character poses, for example), edges change their color to reflect this.
In addition, edges are used for rendering object trajectories in certain modes (to learn more about this subject, see the Trajectories chapter).
Edges can be created manually, using the Commands menu:
1. Select two Point Controllers.
2. Select Rig additional → Create edge from the menu:
Now, the selected Point Controllers should be connected by the newly added Edge.