Crescent

By Paul Bourke

August 2002

x = (2 + sin(2 pi u) sin(2 pi v)) sin(3 pi v)

y = (2 + sin(2 pi u) sin(2 pi v)) cos(3 pi v)

z = cos(2 pi u) sin(2 pi v) + 4 v - 2

0 <= u <= 1, 0 <= v <= 1