I am new to motion builder, and having a problem. The lab I work for uses motion capture of eight data points, four on the head and four on the sternum. It gets exported in .c3d data. I downloaded some dummy .c3d data online so I know how to use it to drive an actor and such. However, the data we get from our lab will not run an actor. I use the data points to create a marker set, yet when the data points move the marker points do not move also. Is there something I am doing wrong? Is a full body set of markers required or will head and chest data work alone? Is there a problem with the data? What can I try differently?