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圆

vertices = 360w = from 0 to (2*PI)r = 10.0x = r*sin(w)y = r*cos(w)

圆面,面上有纹理坐标,有顶点色

vertices = D1:360 D2:100u = from 0 to (2*PI) D1v = from 0 to 10 D2x = sin(u)y = cos(u)r = (x+1)/2g = (y+1)/2b = v/10x = v*xy = v*y

椭圆

vertices = 1000r = 10.0e = 0.75t = from 0 to (2*PI)p = r/(1.0 - e*cos(t))x = p*sin(t)y = p*cos(t)

随机生成的椭圆

vertices = 360w = from 0 to (2*PI)a = rand2(1, 20)b = rand2(1, 20)x = a*sin(w)y = b*cos(w)

 使用圆内旋轮线原理生成的椭圆

vertices = 12000a = 10r = 5d = rand2(0.5, 10)t = from 0 to (2*PI)x = (a - r)*cos(t) + d*cos((a/r - 1)*t)y = (a - r)*sin(t) - d*sin((a/r - 1)*t)

椭圆面

vertices = D1:360 D2:100u = from 0 to (2*PI) D1v = from 0.01 to 3 D2r = 10x = r*v*sin(u)y = r*cos(u)