I need some help figuring out this output I'm getting (Attached). I can't tell
if its a bug or someting else that I just don't know about like surface
coincidence. I don't recognize what might be causing the planar like objects.

The spherical sweep code is

#declare i_start = 0;
#declare i_stop = 3;
#declare i_step = 0.05;
#declare i_inc = i_start;
sphere_sweep {
  linear_spline                 // linear curve
  //cubic_spline                // alternative spline curves
  //b_spline
  (i_stop - i_start)/i_step + 1,    // number of specified sphere positions
#while(i_inc<=i_stop)
  #declare y_coor = 0.23*sin(7.1*i_inc);
  <i_inc, y_coor, 0>, 0.05
        #declare i_inc = i_inc + i_step;


#end


pigment{color Orange}

}

The scene file is



#version 3.6;

#include "colors.inc"

global_settings {
  assumed_gamma 1.0
}


camera {
  location  <0, 0.0, -4.0>
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0.0, 0.0,  0.0>
}

sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.6,0.7,1.0>]
      [0.7 rgb <0.0,0.1,0.8>]
    }
  }
}

light_source {
  <0, 0, 0>            // light's position (translated below)
  color rgb <1, 1, 1>  // light's color
  translate <-30, 30, -30>
}

plane {
  y, -2
  pigment { color rgb <0.7,0.5,0.3> }
}

#declare i_start = 0;
#declare i_stop = 3;
#declare i_step = 0.05;
#declare i_inc = i_start;
sphere_sweep {
  linear_spline                 // linear curve

  (i_stop - i_start)/i_step + 1,    // number of specified sphere positions
#while(i_inc<=i_stop)

  #declare y_coor = 0.23*sin(7.1*i_inc);
  <i_inc, y_coor, 0>, 0.05
        #declare i_inc = i_inc + i_step;


#end


pigment{color Orange}

}

Can someone explain this?

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Attachments:
Download 'sun20100327a.png' (15 KB)

Preview of image 'sun20100327a.png'