"Hugo" <hua### [at] post3teledk> ha scritto nel messaggio
news:3d4029bc$1@news.povray.org...
> Jack wrote:
> > Your renders have such reality
> > --a call for a tutorial to help the rest of us!
>
> I agree that Jonathan uses a great setup of light and reflections! The
> textures impress me, and the window reflecting on the yellow plastic is much
> more interesting than the usual round highlights. I never got that to work.

Oh that's easy: just add an ambient 20 sky inside the one used for the global
illumination and put the no_image flag into it (otherwise the pic will look, hum,
*burnt*).

> The render time is very low considering what is going on. I'd like an
> explanation too.

I didn't use very high radiosity settings.

But the trick is another one: you all know indoor pure radiosity scenes are awfully
hard to get good, usually because the skylight has very little room to pass through
(a window or a door for instance), and you need very high settings but things don't
look good either...
What I do here (and what I did elsewhere) is to add the no_image flag to the wall
where the window is... it looks right, it doesn't need damn high settings hence the
low render time. :-)

Hopefully I was clear enough, otherwise I can post the source if asked so.

--
Jonathan.

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"Apache" wrote:
> kitchens without roaches --> not real. I know many people with fake
> kitchens.

Roaches?! Poor little kid, what do my ears have to hear? Do bad men make you work
there?
<j/k> :-)

> never mind. This is absolutely ROLEX-worthy.

Thanks!

--
Jonathan.

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JRG wrote:
> add an ambient 20 sky inside the one used for the global
> illumination and put the no_image flag into it
>
> What I do here (and what I did elsewhere) is to add the
> no_image flag to the wall where the window is... it looks
> right, it doesn't need damn high settings hence the
> low render time. :-)

Thanks! I just read in the POV docs about the no_image keyword, because it
seems strange to me that this should work any different than having a real
wall to block the light.

From what I understand, the faked wall will actually emit a strong light
(because of ambient 20) but it isn't visible to the camera, only radiosity
reacts to it.. And perhaps objects with reflection reacts to it also, in
which case these objects will need uncommon finish statements.

Sounds strange that this should allow for lower settings for radiosity.

I'll experiment when I get the time.
You are welcome to post an example.

Regards,
Hugo

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"Hugo" wrote:
> JRG wrote:
> > add an ambient 20 sky inside the one used for the global
> > illumination and put the no_image flag into it
> >
> > What I do here (and what I did elsewhere) is to add the
> > no_image flag to the wall where the window is... it looks
> > right, it doesn't need damn high settings hence the
> > low render time. :-)
>
> Thanks! I just read in the POV docs about the no_image keyword, because it
> seems strange to me that this should work any different than having a real
> wall to block the light.
>
> From what I understand, the faked wall will actually emit a strong light
> (because of ambient 20) but it isn't visible to the camera, only radiosity
> reacts to it.. And perhaps objects with reflection reacts to it also, in
> which case these objects will need uncommon finish statements.
>
> Sounds strange that this should allow for lower settings for radiosity.
>
> I'll experiment when I get the time.
> You are welcome to post an example.

Excuse my bad explanation.
Let's try again: :o)

first of all, keep in mind that no_image objects do not affect radiosity. This means
that I use the no_image flag because I don't want the object to affect radiosity yet
I want it to be visible through the reflections.
That said:
I don't use ambient 20 with the wall. I use it with a sphere, which I put inside the
*real* sky_sphere. Ambient 20 would mess up my radiosity setup, so I also use the
no_image flag in order to make this sky only visible through the reflections. It is
this very bright sky which causes those nice window highlights on the reflective
objects. Of course you also need another skysphere in order to light the scene.
As for the wall, I use the no_image flag so that the scene is lit just as if the wall
were not there. You see the wall in the reflections (actually the drawback is that it
is completely black) but it doesn't affect radiosity, and the skylight has so much
more room to pass through. This is the key: the no_image wall does _not_ block the
light.

--
Jonathan.

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"Hugo" wrote:
> You are welcome to post an example.

Done. Posted to p.b.s-f.

--
Jonathan.

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Thanks!  I got it now!
I'm experimenting now.  :o)
Also thanks for posting an example!

Regards,
Hugo

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I like this image, except for the perspective distortion.
I particularly like the highlights and the subtle wrinkling at the edges of the
labels. Nice touch!

--
light_source{0,1}#macro c(J,a)sphere{0,1pigment{rgb z}scale a translate J+O}
#end#macro B(R,V,O)c(0,4)intersection{c(V,R)difference{c(-z*4x+10)c(-z*4.1x+
10)c(0<7.5,45,5>)}}#end B(12,0z*25)B(8y*4<0,12,50>)          // Batronyx ^"^

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"JRG" <jrg### [at] hotmailcom> wrote in news:3d3f0830@news.povray.org:

> Just a quick test with my brand new copy of POV-Ray 3.5. The juice
> looks more like tea, I know, I should have used scattering media, but
> I didn't have the time to play with its settings, I had to turn back
> to my quantum physics... It took me more or less 30 minutes to code
> and 2 hours and 25 minutes to render on an Athlon 1 Ghz 384 MB.
> 
> Cheers,
> 
> --
> Jonathan.
> 
> 
> 
> 
> begin 666 ace.jpg
>  
> Attachment decoded: ace.jpg
> `
> end
> 

Awesome!  I really think you guys ought to start posting these sorts of 
images to some of the popular CG forums (cgtalk.com, cgchat.com, etc.).  It 
would help to promote PovRay, and maybe even humble some of the 
finalRender/Brazil/etc. fanatics.

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