3-DIMENSIONAL UNSTRUCTURED MESH GENERATION .2. SURFACE MESHES

This paper deals with surface patches and surface meshing. Triangular and quadrilateral patches in linear and quadratic forms, and Non-Unifo rm Rational B-Spline (NURBS) patch have been used to define surface ge ometry. From the real application point of view, data conversion betwe en the mesh generator and some existing CAD packages has been consider ed. As a result of this study, converters from a graphics data standar d and several CAD data formats have been implemented. The quality impr ovement of surface meshes has been discussed in terms of parametric pl ane stretching, diagonal swapping and smoothing procedures. Furthermor e, a scheme of visual representation is introduced to utilize colour e ffect in validating the geometry and its surface meshes.