mca### [at] aolcom news:8g9ap0p5b48db4qi39789e7h4dvfbr9sek@4ax.com

> Hmm, ior was set too low for both liquid and glass. The liquid is a
> solid :-) so I'll try a ripple noise pattern wank up the photons for
> caustics and let it run overnight. 

Also YOu might
1) turn on radiosity
2) add scattering media to water and set media on in radiosity{}

-- 
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics

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"Stephen McAvoy" <mca### [at] aolcom> wrote in message
news:8g9ap0p5b48db4qi39789e7h4dvfbr9sek@4ax.com...
> On Fri, 12 Nov 2004 15:23:55 -0500, "Slime" <fak### [at] emailaddress>
> wrote:

>....wank up the photons ....

<snigger>

Andy Cocker

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"Rafal 'Raf256' Maj" <spa### [at] raf256com> wrote in message
news:Xns959FE37EC56A3raf256com@203.29.75.35...
> mca### [at] aolcom news:8g9ap0p5b48db4qi39789e7h4dvfbr9sek@4ax.com
>
> > Hmm, ior was set too low for both liquid and glass. The liquid is a
> > solid :-) so I'll try a ripple noise pattern wank up the photons for
> > caustics and let it run overnight.
>
> Also YOu might
> 1) turn on radiosity
> 2) add scattering media to water and set media on in radiosity{}
>
> -- 

3) buy more whiskey.

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"Slime" <fak### [at] emailaddress> wrote...
> > I do like a wee dram but I noticed that when I turned on photons the
> > whisky colour of the shadow went.
>
> This is physically correct. Any light passing through the glass becomes a
> photon. Notice that the photon-covered areas *are* colored, since that
light
> is filtered by the color of the drink. The rest of the shadow is uncolored
> because none of the light hitting that area has passed through the glass.

Correct.  It is interesting how our perception of our world often differs
from reality.  When I started working on the photon code, I started looking
more closely at real items in the real world, and I noticed that many
shadows of clear objects (such as a glass of water) looked very different
than how I thought they "should" look.  The reality is that much of the
shadow area is almost completely black.  However, when we casually view
something like a glass of water, if we don't look carefully, our brains have
a tendency to fill in details that really aren't there.

-Nathan

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> Correct.  It is interesting how our perception of our world often differs
> from reality.  When I started working on the photon code, I started looking
> more closely at real items in the real world, and I noticed that many
> shadows of clear objects (such as a glass of water) looked very different
> than how I thought they "should" look.  The reality is that much of the
> shadow area is almost completely black.  However, when we casually view
> something like a glass of water, if we don't look carefully, our brains have
> a tendency to fill in details that really aren't there.

Ah yes - the mind does not always perceive what is before the eye... 
(See any optical illusion for a simple proof of this concept.)

Personally, I would suggest that maybe the lightsource is in the wrong 
place (and/or should be an area light - do photons respond to those?)

Andrew.

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On Fri, 12 Nov 2004 21:21:13 -0000, "Andy Cocker"
<mai### [at] andrewcockercouk> wrote:

>>....wank up the photons ....
>
><snigger>
>
>Andy Cocker

Freudian slip or just getting senile :-)
Of course I meant "crank up the photons"


Regards
        Stephen

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On Fri, 12 Nov 2004 16:40:40 -0500, "Ross" <rli### [at] everestkcnet>
wrote:

>3) buy more whiskey.

That was the correct solution. By doing that I could see that Slime is
right on both counts. The unlit shadow (?) should be uncoloured and if
I reduce the ior to 1 then all of the shadow is coloured.
I would have bet a mars bar that the shadow should have been coloured
with intense caustics. 
I'll do a bit more experimenting and post later.


Regards
        Stephen

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Andrew the Orchid nous apporta ses lumieres ainsi en ce 2004-11-13 
04:14... :

>> Correct.  It is interesting how our perception of our world often 
>> differs
>> from reality.  When I started working on the photon code, I started 
>> looking
>> more closely at real items in the real world, and I noticed that many
>> shadows of clear objects (such as a glass of water) looked very 
>> different
>> than how I thought they "should" look.  The reality is that much of the
>> shadow area is almost completely black.  However, when we casually view
>> something like a glass of water, if we don't look carefully, our 
>> brains have
>> a tendency to fill in details that really aren't there.
>
>
> Ah yes - the mind does not always perceive what is before the eye... 
> (See any optical illusion for a simple proof of this concept.)
>
> Personally, I would suggest that maybe the lightsource is in the wrong 
> place (and/or should be an area light - do photons respond to those?)
>
> Andrew.

You need to add "area_light on" in the light's photons block in addition 
to the area_light in the light's deffinition. Otherwise, it will act as 
a point light for the photons.

Alain

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On Sat, 13 Nov 2004 09:14:49 +0000, Andrew the Orchid <voi### [at] devnull>
wrote:

>Personally, I would suggest that maybe the lightsource is in the wrong 
>place (and/or should be an area light - do photons respond to those?)

Whilst I now agree that the shadow should be black/grey I am still
trying to fake it, out of perversity. Where do you suggest that the
light source should be situated? Why use an area light? 


Regards
        Stephen

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Thanks for all your help, so have a little drink on me.

Regards
        Stephen

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