Figure 2
From: New Bending Algorithm for Field-Driven Molecular Dynamics
Curved coordinate transformation between coordinates (x,y,z) and (x′,y′,z′). The point P is located at (x,y) in the flat coordinate while at (x′,y′) in the curved one. The y′ axis is turned with θ refers to the vertical direction and perpendicular to x′ axis. The distance between x and x′ in the horizontal plane is d