Hello,

on a linux 64bits (amd/ubuntu), compilation from sources.
Beta 31

There is something fishy when the bounding optimisation is turn on.

Bugs:
   1. povray -Ibug.pov +MB1 +A0.01

No Bugs:
   1. povray -Ibug.pov +MB100 +A0.01




//start scene
global_settings{max_trace_level 55}
camera {location  <0,0,-18> look_at <0,0,0> angle 55}

background {rgb <.8,0.7,0>}

light_source {<-30, 100, -30> color rgb 1.6}
// light_source {<-30, -100, -30> color rgb 1.6}

#declare f_sphere = function { internal(61) }
#declare f_rounded_box = function { internal(60) }
isosurface {
  function { f_rounded_box(x, y, z, 0.3, 0.8, 1, 0.8)  }
//  contained_by{box{<-0.85, -1.4,-0.25>,<0.85, 1.4, 0.85>}}
  contained_by{sphere{<0,0,0>,0.9} }
  pigment {rgb 1}
  scale <3,4,3>
  translate x*4
}
//end scene

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