When I use media on a plane that intersects another object ("intersects" in the
non-CSG sense), there is sometimes a narrow gap at the line of intersection. It
happens with blobs and isosurfaces, but not with spheres, boxes, tori, etc.

What's up with that?

Accuracy mitigates the problem with isosurfaces, but sturm has no effect on
blobs.
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global_settings { assumed_gamma 1 }
background { rgb <0.4, 0.6, 1> }
light_source { <1, 1, -1> * 1000 rgb 1 }

camera
{  angle 30
   location <0, 0.5, -2.5>
   look_at 0
   right image_width * x
   up image_height * y
}

blob
{  sphere { <-0.55, -0.3, 0>, 0.925, 2 }
   sturm
   pigment { rgb 1 }
}

sphere
{  <0.55, -0.3, 0>, 0.5
   pigment { rgb 1 }
}

plane { y, -10 pigment { rgb 1 } }

plane
{  y, 0 hollow
   texture
   {  pigment { rgb 1 filter 1 }
      finish { reflection { 0 1 fresnel } conserve_energy }
   }
   interior
   {  ior 1.34
      media { absorption <0.272, 0.046, 0.010> }
   }
}
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In the example, a mutilated blob is on the left, and an unaffected sphere is on
the right.

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