Night lights volume refers to the surrounding skin areas. Trailing (Node point) calculated as integrals (Integral) the equation for the vector value that consists of the derivative of the equation for each substrate surface.
Finite volume refers to the surface area around the point (Node point) to calculate the integrals (Integral) equations comprising the vector of the surface of the substrate.
Finite volume shall refer to the area around the junction surface (Node point) calculation is integral (Integral) differential equations that consists of the vector of the surface equation of each surface.