The intersection of two isosurfaces is now {A | B} and the merge of two
isosurfaces is now {A & B}, whereas in previous betas (and MegaPOV) it
was the other way round.


I guess this is probably as a consequence of fixing the bitwise
functionality of the "&" and "|" operators in functions as reported in:-

Are '&' and '|' swiched?
(when used in a function operating on numbers they have the opposite
effect)
http://news.povray.org/Xns9128A184570B3seed7@povray.org


Perhaps this is the way that the maths works, but the other way round
seems much more intuitive (i.e. that the intersection is those points in
A and in B). If this is the way things are going to be, then the
documentation needs to be switched round to match.

Example: This is a box under betas 1 through 7.

isosurface {
  function { (y*y-1) &  (x*x-1)  &  (z*z-1) }
        max_gradient 3
        contained_by{sphere{0,2.5}}
        pigment {rgb 1}
}

camera { location  <3,3,-5> look_at <0, 0, 0>}

sky_sphere { pigment {
    function{abs(y)}
    color_map { [0.0 color blue 0.6] [1.0 color rgb 1] } 
  }
}

light_source {<100,200,-100> colour rgb 1}


POV 3.5b8, Win 98se, Celeron II 850, 128 Mb

-- 
Mike Williams
Gentleman of Leisure

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