director(action,varargin) is a three-dimensional virtual environment that can be used to visualize motion capture data within MatLab. Current version is able to read files in which standard Plug-in Gait (lower or full) marker set is used and display body using 'bones'. Otherwise, only markers will show NOTES - If trials contain force plate data, force plates and ground reaction force vectors (for up to three plates) will appear in the virtual space - Additional objects ('props') can be loaded (see 'cinema objects' sub-folder of 'Visualization' folder. Limited functionality currently exists for these additional objects. User is encouraged to modify or add objects by studying the method used to display force plates - Step 3 in the director instructions from the manuscript (appendix C) is automatically done in current version of director