A vector sum track represents the vector sum of a collection of vector tracks. It's steps are not marked but instead are determined by the components of the vectors in the sum.

A vector sum is drawn with a dashed line to distinguish it from vector tracks and motion vectors. See Vector and Point Mass for additional information.

1. Adding Vectors to a Vector Sum

Select the vectors to include in a sum by checking them in the Select Vectors dialog. The dialog is displayed when the vector sum is initially created or by choosing Select Vectors in the vector sum's track menu.