This section contains recommendations on construction of body parts to make them compatible with the model structure of the AnyScript Repository.

Building an AnyScript model of a body part or the complete body is much like any other complex construction work in the sense that it requires planning and coordination. This is particularly true if different people divide the task between them and later assemble the model. These are the general recommendations:

The Repository uses the ISB coordinate system.

The International Society of Biomechanics is endorsing the use of a particular convention for coordinate axes in the human body, and so are we. These recommendations are published in these references:

Wu G, Cavanagh PR.: ISB recommendations for standardization in the reporting of kinematic data. J Biomech 1995 Oct;28(10):1257-1261

Wu G, Siegler S, Allard P, Kirtley C, Leardini A, Rosenbaum D, Whittle M, D'Lima DD, Cristofolini L, Witte H, Schmid O, Stokes I.: ISB recommendation on definitions of joint coordinate system of various joints for the reporting of human joint motion-part I: ankle, hip, and spine. J Biomech 2002 Apr;35(4):543-548.

Conventions like these are always debatable. For instance, ISB recommends a vertical y axis, where many users probably feel that a vertical z axis is natural But there is a distinct benefit to having a standard, so most of the models in the repository adhere to the ISB recommendation.

The Repository uses SI Units

SI units are based on meters, kilograms and seconds. They are consistent and therefore eliminate the possibility of miscalculations due to hidden conversion factors. For instance, a seemingly consistent use of millimeters instead of meters in a model may lead to the devious error of square root 1000 in some types of calculations. The AnyBody Modeling System expects all angles to be specified in radians. If you feel more comfortable working with degrees you can use expressions to convert to radians like this example where we specify an angle of 30 degrees:

AnyVar KneeAngle = 30*Pi/180;

Bodies and environments

When you load a model from the repository and investigate its tree, you will find that it is structured with one folder for the body parts (HumanModel), one folder for the environment (EnnvironmentModel), and one folder for the connection between the human model and the environment (ModelEnvironmentConnection).

The idea behind this system is to make the human model and the environment model as independent of each other as possible.

Some models also have a folder called Mannequin for control of posture.