Geometric Information and Rational Parametrization of Nonsingular Cubic Blending Surfaces

Table 2

A classification of nonsingular cubic surfaces (derived from [14]).

Surface type	𝐹1	𝐹3	𝐹5	𝐹2	𝐹4	𝐹3
Number of real roots of D(𝜆)=0	5	5	5	3	3	1
Number of real factorizations	5	3	1	3	1	1