Please help !!!

I can't get this working:
the intersection between an isosurface (a sphere for testing purposes)
and a union of complex CSG. The only result I can get is the
intersection of the surfaces, not the solid objects...

I use this code:

camera {
	location <-8,6, -10>
	right x*4/3
	up y
	angle 40
	look_at <0, 1, 1.5>
}


light_source { <40, 30, -10> color rgb .9 }
light_source { <-40, 20, 10> color rgb .2 }


#declare T_Text = texture {
	pigment { color rgb <255, 0, 0>/255 }
	finish { ambient .4 diffuse .6 }
}


#macro Rounded_Tower(MajRayon1, MajRayon2, MinRayon2, Taille)

union {
	cylinder { <0,Taille - MajRayon2 -.1,0>, <0,Taille,0>, MajRayon2 }
	torus { MajRayon2, MinRayon2 translate y*(Taille - MinRayon2) }
	cone { <0,0,0>, MajRayon1, <0,Taille - MinRayon2,0>,
MajRayon2+MinRayon2 }
	texture { T_Text }
}

#end


#macro Rounded_Wall(Longueur, Largeur, Angle, Rayon, Taille)

union {
	box { <0, -Taille/cos(radians(Angle)), -Rayon>, <Longueur, 0,
Largeur*.5>
		rotate Angle*x
		translate <0, Taille-Rayon, -Largeur*.5+Rayon>
	}
	box { <0, -Taille/cos(radians(Angle)), -Largeur*.5>, <Longueur, 0,
Rayon>
		rotate -Angle*x
		translate <0, Taille-Rayon, Largeur*.5-Rayon>
	}
	cylinder { <0, 0, 0>,  <Longueur, 0, 0>, Rayon
		translate <0, Taille-Rayon, -Largeur*.5+Rayon>
	}
	cylinder { <0, 0, 0>,  <Longueur, 0, 0>, Rayon
		translate <0, Taille-Rayon, Largeur*.5-Rayon>
	}
	box { <0, 0, -(Largeur*.5-Rayon)>, <Longueur, Taille,
(Largeur*.5-Rayon)> }
	texture { T_Text }
}

#end


intersection {
/*	sphere { 0, 1
		scale <6, 3, 3>
		translate <-2,0,2>
		texture { T_Text }
	}*/
	isosurface {
		function { sqrt(x*x+y*y+z*z) -1 }
		threshold 0
		bounded_by { sphere { 0, 1.2 } }
		max_trace 10
		scale <6, 3, 3>
		translate <-2,0,2>
		texture { T_Text }
	}
	union {
		object {
			Rounded_Tower(1.2, .8, .1, 2)
			translate -3*x
		}
		object {
			Rounded_Tower(1.2, .8, .1, 2)
			translate 3*x
		}
		object {
			Rounded_Wall(6, 1.2, 15, .2, 1.5)
			translate -3*x
		}
	}
}



If you replace the sphere isosurface by a sphere primitive, you obtain
the good results....

What I'm doing wrong ????
I can't get an explanation, help please ....

Bouf.

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