Hi, all, following is a very simple scene, why the image is not so smooth,
have any ideas?
/////////////////////////////////////////////////////////
  camera {
    location <0, 2, -3>
    look_at  <0, 1,  2>
  }
  sphere {
    <0, 1, 2>, 2
    texture {
      pigment { color rgb<1,1,0> }
    }
  }
  light_source { <2, 4, -3> color rgb<1,1,1>}
/////////////////////////////////////////////////////////

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