4.12.3.1 Conventions 
- 
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
space.
- 
Vs denotes a vertex in 3D.  For example, Vw is a vertex in world
space.
- 
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
t.
- 
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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