Wasn't it marabou who wrote:
>hello,
>
>currently I render a scene with an isosurface and a mirror showing that 
>isosurface.
>isosurface is created like:
>difference{
>       object { isosurface1_containedby_box }
>       object { 
>               isosurface2_containedby_box 
>               translate y*-value
>       }
>       rotate x*90
>}
>the result is a nearly planar surface.
>the mirror has reflection 0.8.
>
>but now backside of isosurface is invisible in mirror.
>I heared about keyword <<hollow>>. 
>does it come in play here? if yes, where do I have to place it? what else can I 
>do?

No, it's nothing to do with "hollow". That's something completely
different.

It's more likely to be the fact that you need to specify a sensible
max_trace count, or use all_intersections, in any isosurface that's
involved in CSG operations (like your "difference").

It's also possible, but unlikely, that the max_gradient required for
rays travelling in the reflected direction is greater than that required
in the forward view. Check the "messages" for max_gradient warnings.

-- 
Mike Williams
Gentleman of Leisure

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1- what do you mean by invisible ...
2 - did you use the contained_by or clipped by statement ...if  clipped by
statement then its 'normal'
3 - i think you probleme comes from contained box ..you should look at it if
a mistake doents occurs ..
4 - did the back of you difference exists ?






news:200### [at] availableyet...
> hello,
>
> currently I render a scene with an isosurface and a mirror showing that
isosurface.
> isosurface is created like:
> difference{
> object { isosurface1_containedby_box }
> object {
> isosurface2_containedby_box
> translate y*-value
> }
> rotate x*90
> }
> the result is a nearly planar surface.
> the mirror has reflection 0.8.
>
> but now backside of isosurface is invisible in mirror.
> I heared about keyword <<hollow>>.
> does it come in play here? if yes, where do I have to place it? what else
can I do?
>
> thanks in advance

Post a reply to this message

erratum ..i forget maxtrace level as mike tells you ...



news:452b9f97$1@news.povray.org...
> 1- what do you mean by invisible ...
> 2 - did you use the contained_by or clipped by statement ...if  clipped by
> statement then its 'normal'
> 3 - i think you probleme comes from contained box ..you should look at it
if
> a mistake doents occurs ..
> 4 - did the back of you difference exists ?
>
>
>
>
>

> news:200### [at] availableyet...
> > hello,
> >
> > currently I render a scene with an isosurface and a mirror showing that
> isosurface.
> > isosurface is created like:
> > difference{
> > object { isosurface1_containedby_box }
> > object {
> > isosurface2_containedby_box
> > translate y*-value
> > }
> > rotate x*90
> > }
> > the result is a nearly planar surface.
> > the mirror has reflection 0.8.
> >
> > but now backside of isosurface is invisible in mirror.
> > I heared about keyword <<hollow>>.
> > does it come in play here? if yes, where do I have to place it? what
else
> can I do?
> >
> > thanks in advance
>
>

Post a reply to this message

I send an image to p.b.images that shows my problem.
I do not have any max_gradient messages, because they are fixed, yet.
the only object is rotated in steps of 90 degrees.
one time the object is visible in mirror one time not.

reference: 
news.povray.org povray.binaries.images:101834

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"marabou" <not### [at] availableyet> wrote in message 
news:200### [at] availableyet...

     Have you tried changing your background colour to see if there's a 
difference?

    ~Steve~


>
> thanks in advance

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On Tue, 10 Oct 2006 15:35:01 +0100
"St." <dot### [at] dotcom> wrote:

> 
> "marabou" <not### [at] availableyet> wrote in message 
> news:200### [at] availableyet...
> 
>      Have you tried changing your background colour to see if there's a 
> difference?
> 
[..]

you mean that colors of background and object are the same? I tried yet, but it makes
not difference.
cool tip!

Post a reply to this message

Yep strange ...i'm still convince that your back is not define ..did the
reflection works if you remove your difference ..
i mean if you anly reflect your object A , or object B alone..






news:200### [at] availableyet...
> On Tue, 10 Oct 2006 15:35:01 +0100
> "St." <dot### [at] dotcom> wrote:
>
> >
> > "marabou" <not### [at] availableyet> wrote in message
> > news:200### [at] availableyet...
> >
> >      Have you tried changing your background colour to see if there's a
> > difference?
> >
> [..]
>
> you mean that colors of background and object are the same? I tried yet,
but it makes not difference.
> cool tip!

Post a reply to this message

On Tue, 10 Oct 2006 17:16:37 +0200
"Penelope20k" <pen### [at] caramailfr> wrote:

> Yep strange ...i'm still convince that your back is not define ..did the
> reflection works if you remove your difference ..
> i mean if you anly reflect your object A , or object B alone..
> 
[..]

i was proud that someone can see anything in mirror with  difference. without you see
less...

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the 'what' you see in the mirror is not your iso surface ..i think its the
reflects light of your isosurface ...
like difference { A B ..with no_reflection statement }

i dont see also the shadow of your isosurface ...this is strange also ..(but
doenst count yet)





news:200### [at] availableyet...
> On Tue, 10 Oct 2006 17:16:37 +0200
> "Penelope20k" <pen### [at] caramailfr> wrote:
>
> > Yep strange ...i'm still convince that your back is not define ..did the
> > reflection works if you remove your difference ..
> > i mean if you anly reflect your object A , or object B alone..
> >
> [..]
>
> i was proud that someone can see anything in mirror with  difference.
without you see less...

Post a reply to this message

On Tue, 10 Oct 2006 17:25:02 +0200
"Penelope20k" <pen### [at] caramailfr> wrote:

> the 'what' you see in the mirror is not your iso surface ..i think its the
> reflects light of your isosurface ...
> like difference { A B ..with no_reflection statement }
> 
> i dont see also the shadow of your isosurface ...this is strange also ..(but
> doenst count yet)
[..]

there is a shadow of isosurface in mirror. look between my painted lines.  there is a
shadow from light on the ground. it ist a little bit blinded.

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