A note on degenerate normal vectors
M Daniel - Computer aided geometric design, 1995 - Elsevier
… The second reference deals with the detection of potential degenerate normal vectors (the
normal vector vanishes). This is particularly of importance since the algorithms used in
CAGD often require the surface to be a regular one, which is never checked. For this
purpose, some definitions have been introduced: … The results stated by the authors are
based on the following sentence: "there exists a line passing through the origin and
intersecting with the normal map of B(u, v) twice, when B(u, v) has an interior degenerate …
normal vector vanishes). This is particularly of importance since the algorithms used in
CAGD often require the surface to be a regular one, which is never checked. For this
purpose, some definitions have been introduced: … The results stated by the authors are
based on the following sentence: "there exists a line passing through the origin and
intersecting with the normal map of B(u, v) twice, when B(u, v) has an interior degenerate …
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