I've not used sphere_sweeps much, but perhaps someone can explain why mine 
looks like it does in this image?  I thought I should see a nice smooth 
transition from one sphere to the other...  Granted, I'm working on a small 
scale (as the code below shows), so is this a precision problem?  I've tried 
fiddling around, but I'm not understanding what's happening.

Any comments as to (a) what's wrong, and (b) how to fix this would be 
greatly appreciated.

- How



#version 3.6;
global_settings {assumed_gamma 1.0}
camera { location <2, 1, -0> angle 1.5 look_at <6.1, 0.115, 5>}
background {color rgb 1}
light_source { <-30, 30, -30> color rgb <1, 1, 1> }

sphere_sweep {
  cubic_spline
  7,
  <0.22, 0.18, -0.000>, 0.00501
  <0.22, 0.17, -0.001>, 0.00452
  <0.22, 0.16, -0.002>, 0.00401
  <0.22, 0.15, -0.002>, 0.00302
  <0.22, 0.14, -0.001>, 0.00301
  <0.22, 0.13, -0.001>, 0.00302
  <0.22, 0.12, -0.000>, 0.00501
  texture{pigment{color rgb <1,0,0>}}
  translate <-0.02,0,-0.005>
  translate <4.77,0.2,3.64999>
}

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