Couldn't find a solution to this problem by changing media parameters so I
wonder if it's possible to remove these specks at all or if there's a bug in the
media code.

For now I only found box and boxed pattern to be the worst but I've seen it to a
lesser degree using sphere and spherical, also very much less using torus and
toroidal warp.

The rendering shown here was post-processed just to overlay a 10% transparent
image from the intersection of the 2 boxes and how the specks mainly align with
those mutual lines. However, 4 specks don't appear to coincide with intersecting
surfaces (lower right).

/* test boxed pattern media bright specks */

//cmd:+oc:\renderings\testmediaspecks

//cmd:+oc:\renderings\testmediaspecksintersect

#version 3.7;

camera {
 location -x*4 look_at 0
 up y
 right image_width/image_height*x
 //angle 30
}

// try with and without this scene container (camera inside)
box{-9,9 hollow pigment{rgb 0.1}} // specks much more apparent

#local Intersect=no; // check how boxes intersect?

#if(Intersect=yes) intersection{ #end

#for(It,0,1,1) // create multiple boxes

box
{
 -1, 1
 hollow on
 pigment
 {
  rgbt 1
 }
 interior
 {
  media
  {
   //method 1
   //intervals 30
   //confidence 0.9
   //variance 1/128
   //ratio 0.5
   //jitter 0.9
   //aa_threshold 0.1
   //aa_level 3
   //samples 33
   emission <0.1,0.1,0.8>
   //absorption 1
   density
   {
    boxed // box pattern centered on <0,0,0>
    density_map
    {
     [0 rgb 1] [0.1 rgb 0] [1 rgb 0]
    }
    //scale 1.01
   }
  }
 }
 rotate <30,30,30>*It
 translate -<1,1,1>*It/2+<1,1,1>*It/2
}

#end

#if(Intersect=yes) } #end

/* END TEST MEDIA SPECKS */

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