The ROLL function calculates the third angle of a body-fixed 3-2-1 yaw-pitch-roll rotation sequence between markers i and j. Marker j defaults to the global coordinate system if it is not specified. Note that roll is an Euler angle.
ROLL (i[,j])
| i | The marker whose rotations are being sought. |
| j | The marker with respect to which the rotations are being measured. |
ROLL(143)
This function returns the roll angle (in radians) of Marker 143 relative to the global coordinate system.