Isoptic surface generation for meshes
Using my geometry library and dual contouring library.
Based on the following articles:
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G. Csima, J. Szirmai: Isoptic surfaces of polyhedra. CAGD 47, pp. 55-60, 2016.
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F. Nagy, R. Kunkli, M. Hoffmann: New algorithm to find isoptic surfaces of polyhedral meshes. CAGD 64, pp. 90-99, 2018.