If you are using 'sturm' and still getting the problem, it's probably
a precision problem (not necessarily bug) in the poly object.

  If you can represent your objects as meshes (and specially if you need
to copy the same object several times), I recommend trying that.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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