Following scene produces a uncorrect rendering where the transparent sphere 
interesects with the blob. Is this a know problem? I think it is quite annoying 
though it can be reduced by scaling the whole scene by a factor.

I tried the scene with version 3.0 and 3.1g as well as with megapov, same result 
everywhere. Where does this effect come from? Some epsilon value? Hmm... but why 
should the ray not hit the blob when it is near the edge of the transparent sphere?

- Micha

//begin code
#declare SCALE=1 //try different values for different
                  //size of the black intersection

camera
{
location <2,1.8,-2>
angle 20
look_at   0
scale SCALE
}

blob{ threshold 0.3
   sphere{<0.021,0.043,0.026>,0.489,1}
   scale 0.779
//  sturm   //does not change anything
   translate <-0.796,-0.889,1.063>
   pigment{rgb 1}
   scale SCALE
}


sphere{<0,0.01,0>,1.4
    pigment{ color rgbt<1,1,1,1>}
    scale <0.8,2,.8>
    translate<0,-1,0>
    scale SCALE
}


light_source{<10,10,-100>
   color 1
   scale SCALE
}

//end code

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