Polyline creates colorful and fully controllable polygonal lines (this is nerd talk for straight lines) that can be animated in After Effects’ real 3D space. This means they can easily weave between your other 3D layers without any fancy comping necessary.  After the polyline is created it can be easily edited. You can edit where it travels in space as well as the color and texture of each segment of the line (or the whole path at once).

Polyline interface provides a set options allowing you to control the width of the polyline, choose one the color themes, create closed polyline, and more!
Thanks to the null objects, you can also animate the segments very easily.

Limitations

• The total length of a polyline cannot exceed the maximum size of a composition, i.e., 30,000px.
• Some display issues sometimes appear with the built-in corner pin effects used by Polyline (Corner Pin and CC Power Pin).
• Some motion paths yield degenerate cases for which a nice polyline cannot be constructed (for instance, a chain of orthogonal segments in x, y, then z plane).
• Modifying segments rotation can sometimes show important texture deformation.