Fig. 4From: Frontiers in biomolecular mesh generation and molecular visualization systemsMethod of triangulating the trilinear surface. a Step 1, Computing the intersection points and extreme points on the faces. b Step 2, Connecting intersection points and extreme points, forming a closed loop. c Step 3, Computing the fold curves and critical points. d Step 4, Dividing into single-valued pieces through the fold curvesBack to article page