A method of constructing a customized foot orthotic model comprises receiving a model for a contoured surface of a foot device, the model corresponding to a plantar surface of a foot. The model includes data representing three-dimensional coordinates of discrete points on the contoured surface. Coordinates of selected discrete points along selected longitudinal and transverse lines on the contoured surface are obtained, and the vertical coordinates of points are adjusted based on received orthotic parameters for a customized orthotic device. A foot orthotic model is constructed, comprising data representing an orthotic surface. The orthotic surface is constructed based on the points with adjusted coordinates, and the foot orthotic model is provided to a fabrication facility for automated fabrication of the foot orthotic device.
