public static class Plane
extends java.lang.Object
A plane in (x,y,z)-space represented by a point and a normal.
Assuming that p is a point on the plane and n is the normal vector,
the half-space {q|pq__n>0} is called the 'upper halfspace' wrt. the plane
and vice versa for the 'lower halfspace'.
If the unit normal vector is n = (nx,ny,nz) and the point on the plane is p = (px,py,pz), then the plane has
equation ax + bx + cx = d where a = nx, b = ny, c = nz, and d = px*nx + py*ny + pz*nz
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