Facsimile Simulation/Emulation Library

Geometry data records are used for dynamic joints, terminal control frames (latter two apply to sets only) and for general cell positioning and scaling. Note: There are two formats for geometry data: standard and matrix form. Only the former is documented here. Matrix form consists of a 4x4 matrix for geometry data and is typically used only when working with graphics that have been converted, by a now defunct AutoMod utility called IGES/Sim, from IGES format. This document describes the standard form only. Standard geometry is used if cell flag bit 3 is clear; matrix geometry is used if this bit is set. Geometry data is made up of three records that describe translation (linear displacement of the local origin along each axis, relative to the parent's local axes), rotation order & rotation (rotational displacement around each local axis) and scaling (a multiplier for all distances measured along each local axis). Each geometry operation repositions the cell's local origin and orientation, which is passed onto, and inherited by, each child cell.

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