Segment Name - Changing this will select another segment to modify.
Kinematics Only - Use this check box for segment where only kinematics need to be calculated (where kinetic calculations are not needed). This is sometimes useful when you want to create a virtual segment where kinetic calculations are not needed such as a virtual foot or virtual lab.
Segment Mass - The segment mass is defaulted based on the type of segment and the subject mass. To change this value, you may type in a specific value for the mass (in kilograms), or use a formula using existing Subject Data (such as a percentage of the subject Mass). This may be helpful if the subject is using a prosthesis that would have a different mass than the part of the body it replaces.
Segment Geometry - The segment may be represented internally as a CONE, .CYLINDER, SPHERE, ELLIPSOID or CUSTOM SEG (ment). The geometry of a segment affects the segment's inertial properties and center of mass location. This also affects the segment geometry drawn when view segment geometry is selected in the animation/model builder window. This would be useful if you have a custom segment defined and need to change the default segment geometry.
Model File - This is the graphic model file (.v3g, .obj, or .wrl) used to draw the segment in the animation/model window. In most cases this would be a bone, but could also be an object such as a golf club, baseball bat, or as you will see in the Just for Fun section below, where a skull is substituted for the pelvis, any object file.
Material File - Material files can be loaded to change the color of a segment. Material file can only be used with .obj files.