i think you must read again ...

i check the bounding  of the intersection ... and not the intersection of 2
bounding ...















news:44c60af5@news.povray.org...
>
> "NEWS" <pen### [at] caramailfr> wrote in message
> news:44c5fa0f$1@news.povray.org...
> > well , from what i have see
> >
> > Povray uses a default value min_extent() of -1 , if the object exists or
> > not
> > , and use a default value max_extent() of 1 if the object exist or not
> >
> > then if i use this
> > #local U=intersection { box {0,1}  box {2,3}}
> >
> > and
> >
> > #local U2= object {U scale 1000}
> >
> > if the object  U doesnt exists then we will always have
> >
> > [max_entent(U2) - max_entent(U) ].x = 0     and
> > [max_entent(U2) - max_entent(U) ].y = 0     and
> > [max_entent(U2) - max_entent(U) ].z = 0
> >
> > and
> >
> >
> > [min_entent(U2) - min_entent(U)].x =0 and
> > [min_entent(U2) - min_entent(U)].x =0 and
> > [min_entent(U2) - min_entent(U)].x =0
> >
> >
> >
> >
> > In brief ..scaling a non existing object will give the same min_extend
> > value
> > and max_extend value that the non-scaled object .. if not then the
object
> > always exists ..
> >
> >
> Fine for boxes only. anything else will test wrong. The corners of two
> sphere's bounding boxes could intersect without the sphere's intersecting
> each other at all. May be it's possible to test it by using the
mathematical
> formula for each object instead - I'm not sure.
>
>
> -- 
> -Nekar Xenos
> "The truth is out there"
>
>

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