Ps denotes a polygon in some space. For example, Pw is a polygon
in world space coordinates. The other spaces are o for object space,
c for camera space, t for texture space, and s for screen
Vs denotes a vertex in 3D. For example, Vw is a vertex in world
Mst denotes a matrix transforming space from s to t.
For example, Mow is a matrix transforming from object to world space.
All Mst are 3x3 matrices.
Vst denotes the corresponding vector transforming space from s to
Ns denotes a plane normal vector (A,B,C) in some space.
Vs.x, Vs.y, and Vs.z are the respective x,
y, and z components of a vector. For example, Vw.y is
the y component of a vector in world space.
Vt.u and Vt.v are the respective u, and v
components of a vector in texture space.
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