> Hello,
> I am pretty sure this is not a bug and I just have some incorrect expectations
> of the materials but I would like to have someone kindly explain this
> phenomenon.
>
> I started making an object and have a cube and wanted to position glass boxes
> around it's sides.  But I get that static like distortion inside the glass you
> normally see when two planes overlap.  I've included the very short code below.
> There is a line to rotate the object 1 degree about the y axis.  If you take
> that one line out and run again, the distortion is gone.
>
> As a bonus, the distortion only appears in the glassSide object that is rotated
> 270 degrees.
>
> Am I doing/thinking about something wrong and this is the correct behavior?
>
> Thanks,
> BBB
>
>
> #include "colors.inc"
> #include "stones.inc"
> #include "glass.inc"
> #include "math.inc"
> #include "textures.inc"
>
> camera{ location<-2, 2, -3>  look_at<0, 0, 0>}
>
> light_source {<0, 20, -20>  color White }
>
> #declare glassSide = box {<-1.5, -.5, -1>
>          <-1, .5, 1>
> }
>
> #declare glassBorder =
> union
> {
>          object { glassSide }
>          object { glassSide rotate<0, 270, 0>  }
> }
>
> union
> {
>          box {<-1, -1, -1>
>                  <1, 1, 1>
>                  pigment { color rgb<0, 0, 1>  }
>          }
>          object
>          {
>                  glassBorder
>                  pigment { color rgbf<1, 1, 1, 1>  } interior {I_Glass} finish{
> phong 0.9 phong_size 40 reflection 0.1 }
>          }
>          scale 1.3
>          rotate<0,1,0>  /* comment out this line */
> }
>
>

You DO have coincident surfaces between the blue box and the transparent 
ones.

Just add "scale 1.0001" to the blue box and the problem disapears.

Also, you should use a merge of the two transparent boxes.




Alain

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