Coordinate frame information is stored in Neutral File Packet 05 (see
Packet Type 05: Coordinate Frames (p. 732) in the Patran Reference Manual). The coordinate frame ID is stored on the Header Card in entry ID. Coordinate frame types are stored on the Header Card in entry IV and are rectangular (IV = 1), cylindrical (IV = 2) and spherical (IV = 3). Three points (A, B, C), each located by three coordinates (1, 2, 3) in the global system, are required to define a coordinate frame. A 3x3 rotation matrix (R) is computed and stored in Packet 05. Four data cards, each containing 5 entries, are used to store the coordinate points and rotation matrix: Data Card 1 (A1, A2, A3, B1, B2), Data Card 2 (B3, C1, C2, C3, R11), Data Card 3 (R21, R31, R12, R22, R32), Data Card 4 (R13, R23, R33).
