Well, I tried the previously listed code, and (very strangely) it started
working as expected.  But the following listing is not working on my windows
version of MegaPOV:

#version unofficial MegaPOV 0.4;
#include "colors.inc"
light_source { <0,0,-8> 1}
camera { location <0,0,-5> look_at <0,0,0> }
#declare a=function{sqr(x)+sqr(y)+sqr(z)}
isosurface
{
 function {a(x,y,z)}
 contained_by{sphere {0,4}}
 threshold 1
 pigment{color rgb <1,1,1>}
}

Is this my computer acting up, or is it MegaPOV, or am I just losing it?

Quadhall -- the puzzled.

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