Pov 3.5 RC6 on Intel 1.7Ghz 512M Ram running Windows 2000

I read in the help that "cubic splines produce the most flexible and smooth
curves" but this does not seem to be the case with sphere sweep. The
linear:spline and b_spline work as advertised but the cubic-spline seems to
curl in on itself and produce a sharp step. This code illustrates this. Is
it supposed to do this?

//pov 3.5 RC6
global_settings { assumed_gamma 1.1 }

#include "stdinc.inc"

  background { color Blue }
  camera {
    location <0, 2, -10>
    look_at  <0, 0,  0>
  }

light_source { <0, 2, -10> colour White }

  sphere_sweep {
    //linear_spline
    //b_spline
    cubic_spline
    9,
    <0, 10, 0>, 1
    <0, 10, 0>, 1
    <0, 2, 0>, 1
    <0,  1, 0>, 0.5
    <0,  0, 0>, 0.3
    <0, -1, 0>, 0.5
    <0,  -2, 0>, 1
    <0,  -10, 0>, 1
    <0,  -10, 0>, 1

    tolerance 0.000001 //0.2
     pigment { color Yellow }
 }

Richard

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