Thank you very much, Tom, for gives me your document, it's very interesting
and it helped me to understood my problem.

Regards,
Oleguer



news:414818d7$1@news.povray.org...
> "Oleguer Vilella" <ole### [at] infonegociocom> wrote in message
> news:41481108$1@news.povray.org...
>
> > Some of the objects appear also moved.
> > I'm thinking....
>
> When you scale an object, the only point of the object that won't move is
the
> point that rests at <0,0,0> (assuming that you're scaling all axis).
>
> To understand what is happening, try the following scene using different
values
> for myScale. Note that we divide the radius of the spheres by the value of
> myScale. This means that the scale size doesn't affect the radius of the
> spheres, only their positions.
>
> camera {
>   location  <0.0, 0.0, -10.0>
>   look_at   <0.0, 0.0,  0.0>
> }
>
> light_source {
>   <0, 0, 0>            // light's position (translated below)
>   color rgb <1, 1, 1>  // light's color
>   translate <-30, 30, -30>
> }
>
> #declare myScale = 1;
>
> sphere{
>   0,0.25/myScale
>   scale myScale
>   pigment{rgb<1,0,0>}
> }
>
> sphere{
>   1,0.25/myScale
>   scale myScale
>   pigment{rgb<0,1,0>}
> }
>
>
>
>

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