Thank you for all your answers.



In fact, it's still and still the same problem of surfaces coincidence. 
Two boxes and four cylinders give too many cases to manage with epsilon 
translation in y.


And as BE says, this object is “too” simple :(
So I started working on a new geometry with no overlap.


<sdl>
// --- a quarter circle
#declare corner = difference {
  cylinder { <0, -H, 0>, <0, 0, 0>, R }
  plane { z,0 }
  plane { x, 0 }
  }


merge {
   // central box
   box { <-S+R, -H, -S+R>, <+S-R, 0, +S-R> }

   // left/right box
   box { <-S+R, -H, -S>, <S-R, 0, -S+R> }
   box { <-S+R, -H, S-R>, <S-R, 0, S> }

   // front/rear box
   box { <S, -H, -S+R>, <S-R, 0, S-R> }
   box { <-S, -H, -S+R>, <-S+R, 0, S-R> }

   // corners
   object { corner translate <+(S-R), 0, +(S-R)> }
   object { corner scale <-1,1,1> translate <-(S-R), 0, +(S-R)> }
   object { corner scale <1,1,-1> translate <+(S-R), 0, -(S-R)> }
   object { corner scale <-1,1,-1> translate <-(S-R), 0, -(S-R)> }

   }
</sdl>


Now everything seems fine.
I can restart my tests with SSS.



-- 
kurtz le pirate
compagnie de la banquise

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