一种左右对称的螺线
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vertices = 36000 t = from (-50*PI) to (50*PI) a = 10 k = rand2(0.2, 5) x = a*(t*cos(t) + k*t) y = a*t*sin(t)
K = 0.2
K = 0.5
K = 1.0
K = 1.2
K = 1.5
K = 5
