When I render the below scene, there are some spurious black artifacts near the
center of the red vuvuzela. Without the translation and rotation, the artifacts
go away. I'm using POV-Ray 3.7.0 on Ubuntu 16.04.

camera {
  right x
  location <0, 0, -10>
  look_at <0, 0, 0>
  angle 25
}

light_source { <-5, 20, -10>, color rgb 1 }
light_source { <5, 20, -10>, color rgb 1 }

// Vuvuzela, with mouthpiece around <2, 0, 0>, flare around <-2, 0, 0>, and max
// diameter around 1.
#declare Vuvuzela = lathe {
  bezier_spline
  24,
  // mouthpiece
  <0.001, 0.2>, <0.001, 0.2>, <0.06, 0.11>, <0.06, 0.1>,
  <0.06, 0.1>, <0.06, 0.09>, <0.07, 0.09>, <0.07, 0.1>,
  <0.07, 0.1>, <0.07, 0.15>, <0.05, 0.19>, <0.04, 0.2>,
  // rest of the vuvuzela
  <0.04, 0.2>, <0.04125, 0.6>, <0.1, 3.5>, <0.5, 3.9>,
  <0.5, 3.9>, <0.51, 3.91>, <0.51, 3.92>, <0.5, 3.92>,
  <0.5, 3.92>, <0.49, 3.92>, <0.1, 3.8>, <0.001, 3.8>
  sturm

  translate -2*y
  scale 0.9
  rotate 90*z
};

object { Vuvuzela pigment { color rgb <1, 0, 0> } }

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