A: (2, -1, 0)
B: (3, -1, 2)
C: (0, 4, 1)
S: (0, 1, 4)
N: (2, 1, -1)
D = Intersect(xAxis, zAxis)
n = Vector(D, N)
t1, c, b, a = Polygon(B, A, C)