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This paper introduces the software TiGL: TiGL is an open source high-fidelitygeometry modeler that is used in the conceptual and preliminary aircraft andhelicopter design phase. It creates full three-dimensional models of aircraftfrom their parametric CPACS description. Due to its parametric nature, it istypically used for aircraft design analysis and optimization. First, we presentthe use-case and architecture of TiGL. Then, we discuss it's geometry module,which is used to generate the B-spline based surfaces of the aircraft. Thebackbone of TiGL is its surface generator for curve network interpolation,based on Gordon surfaces. One major part of this paper explains themathematical foundation of Gordon surfaces on B-splines and how we achieve therequired curve network compatibility. Finally, TiGL's aircraft component moduleis introduced, which is used to create the external and internal parts ofaircraft, such as wings, flaps, fuselages, engines or structural elements.

TiGL - An Open Source Computational Geometry Library for Parametric Aircraft Design