Wasn't it scorpmetal who wrote:
>I want to make a mouvement of 2 objects different. And the camera look at
>the center point in this mouvement. In this case, my 2 object is the cone
>and the difference(cylinder and quadric). How I can make this? I hope you
>understand my question!!! Thanks a lots
>
>camera{
>        location  < 0 , -2 , 0.0 >
>        look_at   < 0 , 1.0 , 0.0 >
>       }
>difference{
>        cylinder{
>                 < 0, -0.4, 0 > , < 0, 2.5, 0 >, 4
>                }
>        quadric{
>                < -1 , 1 , -1 >         //  A x^2  + B y^2  +  Cz^2
>                < 0 , 0 , 0 >           //  D xy   + E xz   + F yz   +
>                < 0 , 2.83 , 0 >        //  G x    + H y    + I z    +
>                1                       //  J
>                }
>        texture {Mirror}
>        translate <2,0,0>}
>cone{
>    <0,-1.5,0>,0,<0,-0.4,0>,0.2
>    pigment {Black}
>    translate <2,0 ,0>
>    }
>

I'd suggest declaring the whole thing as a single union. The centre of
that pair of objects is approximately the centre of the bounding slab of
the union.

#declare THING = union {
  difference { ...
  cone {...
}

#declare CENTRE = (min_extent(THING)+max_extent(THING)) / 2;

camera {
  ...
  look_at CENTRE
}

Alternatively you could calculate the centres of the two parts in a
similar way and take the average of those two values.

-- 
Mike Williams
Gentleman of Leisure

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