Unfortunately, fillets tend to create many more polygons. When approximating a smooth surface with polygons, it is common to apply a fillet operator onto a sharp edge in order to convert it into a rounded edge. This means that near that feature, no actual subdivision will be applied, and the resulting limit surface will be unchanged from the control mesh. In cases where a sharp feature needs to be preserved, an edge or vertex can be tagged as a crease or a corner. However, due to the nature of triangles, derivatives can be discontinuous from face to face, which may lead to texturing artifacts that require extra effort to solve.
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