这也是一种贴在球上的曲线

#http://www.mathcurve.com/courbes3d/loxodromie/sphereloxodromie.shtml

vertices = 1000

t = from (-PI*0.5) to (PI*0.5)

k = rand2(0, 2*PI)

r = 10

x = r*cos(t)/ch(k*t)

y = r*sin(t)/ch(k*t)

z = r*th(k*t)

这个曲线看上去很普通,不过将上述代码中的k改为一个维度输入:

vertices = D1: D2:

u = from (-PI) to (PI) D1

v = from (-PI) to (PI) D2

r =

x = r*cos(u)/ch(v*u)

y = r*sin(u)/ch(v*u)

z = r*th(v*u)

生成一个有两个缺口的球: