My projects: SUGG (M, KS), CRZST, SYNONS, URLS, Misc: 3Dengine, UniteHowTo, FliCC, My blog.
Old/abandoned: TheRarestWords (TcCrnch). 		Hi, I'm Slava V. and I develop those projects in free time. rarestwords@mail.ru
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Plane

Plane is 2D object consisting of all it's points - i.e. infinite flat surface.

Geometric formula

Plane in 3D space can be defined as 
Ax + By + Cz + D = 0
(A,B,C) is plane normal. D is calculated by substituting x,y and z with coordinates of any known point.