In this method, one side (the side from the viewer) is painted white and the other side is painted dark.
Direction of white face can be determined using A.B > 0
Where, A: Normal vector with coordinates (x,y,z)
And B: A vector in viewing direction
When A.B > 0: Polygon is facing towards viewer: Should not be removed
When A.B < 0: Polygon is facing away from viewer: Should be removed