Efficient Boundary Extraction from Orthogonal Pseudo-Polytopes: An Approach Based on the 𝑛D-EVM

Figure 6

Discovery of a specific face in a 4D-OPP via Algorithm 4 (see text for details).

(a) A 4D-OPP 𝑝

(b) Brinks of 𝑝

(c) Φ¹₁(𝑝),Φ¹₂(𝑝),andΦ¹₃(𝑝)

(d) FD¹₁(𝑝)andFD¹₂(𝑝)

(e) BD¹₁(𝑝)BD¹₂(𝑝)

(f) Processing 2D forward and backward differences of FD¹₁(𝑝)