Modify_Force_Structure_Parameters
/USED= Number of Force Structures Used
! /TYPE= Not currently used
! /NUM_FP_IN= Number of Force Platforms assigned to each force structure
! /FP_INDEX= Index number of each platform
! /NUM_SURFACES_OUT= Number of output surfaces for each force structure
! /SPEED_VALUES= the speed of the surface of each structure (e.g. an instrumented treadmill)
! /SPEED_CHANNELS= analog channel number for the speed of each structure
! /SPEED_SCALES= scale factor for the analog channel
! /CORNER1= corner locations for each output surface
! /CORNER2=
! /CORNER3=
! /CORNER4=
/USE_FORCES_FOR_KINETICS= are forces kinematics only?
/COMBINE_INPUT_FORCES= combine all forces for each structure into a single force
! /UPDATE_C3D_FILE= FALSE
;

For example, the following force structure has one surface attached to two force platforms.

Modify_Force_Structure_Parameters /USED=2 /TYPE=0+0 /NUM_FP_IN=2+1 /FP_INDEX=2+3+4 /NUM_SURFACES_OUT=2+2 /SPEED_VALUES=0+0 ! /SPEED_CHANNELS= ! /SPEED_SCALES= /CORNER1=1533.16+464.5+0+2038.16+464.5+355.6+1450+0.5+177.8+2017.84+0.5+533.4 /CORNER2=1533.16+0.5+0+2038.16+0.5+355.6+1450+464.5+177.8+2017.84+464.5+533.4 /CORNER3=1269+0.5+0+1774+0.5+355.6+1810+464.5+177.8+2282+464.5+533.4 /CORNER4=1269+464.5+0+1774+464.5+355.6+1810+0.5+177.8+2282+0.5+533.4 /USE_FORCES_FOR_KINETICS=TRUE+TRUE /COMBINE_INPUT_FORCES=TRUE+FALSE ! /UPDATE_C3D_FILE=FALSE ;