Adaptive meshing is an essential pre-requisite for various problems in finite element simulation. In this paper, we focus on the meshing of parametric surfaces conforming to a prescribed size field. In our indirect approach, this size field is induced into each parametric domain. This defines a Riemannian metric field, and a combined advancing-front generalized-Delaunay method is then used. However, this requires the derivatives of the parametric mapping functions are known. This information is not necessarily provided by CAD systems or may be costly to compute. For this reason, we propose a new and efficient method to obtain the discrete derivatives of the mapping functions.
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