For example if a lab was set up such that the person walked in the –X direction, +Z was vertical, and +Y was to the subjects left. (See Appendix for an example of Visual3d mdh script could be used to create a compatible virtual lab.

! ! Segment v3d_lab ! HYBRID_SEGMENT ! /CALIBRATION_FILE= /TYPE=Visual_3D /NAME=v3d_lab /REFERENCE_OBJECT=Medial Distal+Lateral Distal+Medial Proximal+Lateral Proximal+Proximal Joint+Distal Joint+Additional Object+Additional Plane+Distal Radius+Proximal Radius /REFERENCE_OBJECT_NAMES=v3d_lab_med_distal+v3d_lab_lat_distal+v3d_lab_med_prox+v3d_lab_lat_prox++++Medial+v3d_lab_Distal_Radius+v3d_lab_Proximal_Radius /REFERENCE_OBJECT_TYPES=LANDMARK+LANDMARK+LANDMARK+LANDMARK+++++METRIC+METRIC /USE_CAL_TARGETS_FOR_TRACKING=FALSE /TRACKING_TYPES=LANDMARK+LANDMARK+LANDMARK+LANDMARK /TRACKING_NAMES=v3d_lab_lat_prox+v3d_lab_med_prox+v3d_lab_lat_distal+v3d_lab_med_distal ! /USE_OPTIMAL_TRACKING=TRUE /KINEMATIC_ONLY=TRUE ! /STATIC_MODEL=FALSE /GRAPHICS_ROT_X=0 /GRAPHICS_ROT_Y=0 /GRAPHICS_ROT_Z=0 /GRAPHICS_SCALE_X=1 /GRAPHICS_SCALE_Y=1 /GRAPHICS_SCALE_Z=1 /GRAPHICS_TRANSLATE_X=0 /GRAPHICS_TRANSLATE_Y=0 /GRAPHICS_TRANSLATE_Z=0 ! /GRAPHICS_UNIT_SCALE=1.000000 /MASS=0.000000 ! /GEOMETRY= /PROX_TO_CG_AXIAL=0.5*v3d_lab_SEG_LENGTH /PROX_TO_CG_ML=0*v3d_lab_SEG_LENGTH /PROX_TO_CG_AP=0*v3d_lab_SEG_LENGTH /IXX=0 /IYY=0 /IZZ=0 ! /AP_DIRECTION= ! /AXIAL_DIRECTION= ! /OBJFILE= ! /COLFILE= ! /DEPTH= ; ! Landmarks Add_Landmark /LANDMARK_NAME=v3d_lab_lat_prox ! /CALIBRATION_FILE= ! /USER_GENERATED=TRUE ! /USE_PERCENTAGE=FALSE ! /CALIBRATION_ONLY=FALSE ! /USE_TARGETS=FALSE /SEGMENT_NAME=LAB ! /TARGET_TYPES= ! /TARGET_NAMES= ! /MCSX=0.0 /MCSY=0.001 ! /MCSZ=0.0 ! /LANDMARK_LOCATION= ! /REFERENCE_LOCATION_NAME= ! /REFERENCE_LOCATION_TYPE= ! /USE_REFERENCE_LOCATION=FALSE ; Add_Landmark /LANDMARK_NAME=v3d_lab_med_prox ! /CALIBRATION_FILE= ! /USER_GENERATED=TRUE ! /USE_PERCENTAGE=FALSE ! /CALIBRATION_ONLY=FALSE ! /USE_TARGETS=FALSE /SEGMENT_NAME=LAB ! /TARGET_TYPES= ! /TARGET_NAMES= ! /MCSX=0.0 /MCSY=-0.001 ! /MCSZ=0.0 ! /LANDMARK_LOCATION= ! /REFERENCE_LOCATION_NAME= ! /REFERENCE_LOCATION_TYPE= ! /USE_REFERENCE_LOCATION=FALSE ; Add_Landmark /LANDMARK_NAME=v3d_lab_lat_distal ! /CALIBRATION_FILE= ! /USER_GENERATED=TRUE ! /USE_PERCENTAGE=FALSE ! /CALIBRATION_ONLY=FALSE ! /USE_TARGETS=FALSE /SEGMENT_NAME=LAB ! /TARGET_TYPES= ! /TARGET_NAMES= ! /MCSX=0.0 /MCSY=0.001 /MCSZ=-0.001 ! /LANDMARK_LOCATION= ! /REFERENCE_LOCATION_NAME= ! /REFERENCE_LOCATION_TYPE= ! /USE_REFERENCE_LOCATION=FALSE ; Add_Landmark /LANDMARK_NAME=v3d_lab_med_distal ! /CALIBRATION_FILE= ! /USER_GENERATED=TRUE ! /USE_PERCENTAGE=FALSE ! /CALIBRATION_ONLY=FALSE ! /USE_TARGETS=FALSE /SEGMENT_NAME=LAB ! /TARGET_TYPES= ! /TARGET_NAMES= ! /MCSX=0.0 /MCSY=-0.001 /MCSZ=-0.001 ! /LANDMARK_LOCATION= ! /REFERENCE_LOCATION_NAME= ! /REFERENCE_LOCATION_TYPE= ! /USE_REFERENCE_LOCATION=FALSE ;