The Statistics says, 
>-------------------------------------------------------------------------
>Ray->Shape Intersection          Tests       Succeeded  Percentage
>-------------------------------------------------------------------------
>Isosurface                      155803           43852     28.15
>Isosurface Bound                223025          155803     69.86

"Isosurface Bound" should be changed to "Isosurface Container".
I used "bounded_by" in the original isosurface patch, but it was 
changed to "contained_by".

------------------------------
functions.inc

#declare f_mesh1 = function { internal(40) }
// Parameters: x, y, z 
    // Five extra Parameters required: 
    // 1. Number of threads per unit in the x direction 
    // 2. Number of threads per unit in the z direction 

'i_internal.pov': lines 969-971
     function { f_mesh1(x,y,z, 1/8, 1/8, 1/10, 0.01, 1/10) }
          //P0= X frequency
          //P1= Z frequency

The first and second extra parameters are not "Number of 
threads per unit" nor "frequency".  
Those are "interval of threads" or "distance between neighboring
threads".

R. Suzuki

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