====== Segment Mass ======

Every [[visual3d:documentation:modeling:segments:segment_overview|segment]] in a Visual3D model has a mass, which is used to calculate kinetic quantities.

=====Default Segment Mass=====

The default segment masses defined in Visual3D are based on [[https://deepblue.lib.umich.edu/handle/2027.42/4540|Dempster's regression equations]] and are (relative to total body mass):

^ Segment ^ Mass (% body mass) ^
|**foot**          |0.0145|
|**shank**         |0.0465|
|**thigh**         |0.10  |
|**hand**          |0.006 |
|**forearm**       |0.016 |
|**upper arm**     |0.028 |
|**pelvis**        |0.142 |
|**thorax/abdomen**|0.355 |
|**head**          |0.081 |
|**trunk**         |0.497 |

=====Modifying Segment Mass=====

Users can modify Segment Mass under the [[visual3d:documentation:modeling:segments:segment_properties|segment properties]] tab in Visual3D's model builder. 

{{:visual3d:documentation:modeling:segments:segmentMass.png}}

===== See Also =====

Go back to the [[visual3d:documentation:modeling:segments:segment_overview|Segment Overview]] for more information about segments in Visual3D.