Heres the (almost) final result of all my playing with photons this weekend.

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Chris Purdy wrote:
> Heres the (almost) final result of all my playing with photons this
> weekend.

Hmm, a tad overdone I think.

Grim

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Whoa, yes, they're cool, but I think you went a little overboard there,
especially with photons on the temple.

Mike

"Chris Purdy" <esc### [at] earthlinknet> wrote in message
news:3cdfbb6a@news.povray.org...
> Heres the (almost) final result of all my playing with photons this
weekend.
>
>
>
>
>

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I know I'm still learning... but I'm not understanding how I "overdid"
it.... isn't povray just calculating the way the photons that are reflected
off the water would look?  I can remember times then I have seen this much
caustic reflection off swimming pools near sunset.

Is there a way to "tone it down"?  If I decrease the photon spacing, I get
nasty speckles everywhere, and if I use a fixed number of photons I get the
same problem.. I stopped using a fixed number when I got up around
10,000,000 and started getting low on memory.

Any of you photon experts, help!!! :)

"Michael Goldshteyn" <mik### [at] wwacom> wrote in message
news:3cdff195@news.povray.org...
> Whoa, yes, they're cool, but I think you went a little overboard there,
> especially with photons on the temple.
>
> Mike
>
> "Chris Purdy" <esc### [at] earthlinknet> wrote in message
> news:3cdfbb6a@news.povray.org...
> > Heres the (almost) final result of all my playing with photons this
> weekend.
> >
> >
> >
> >
> >
>
>

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Here's another comment from the peanut gallery :)

I recommend toning down the sunlight quite a bit.  The decreased contrast
and increased gray level (remember, a proper photograph is 22% gray average)
I think makes it look more realistic.  Especially on the concrete.  Also,
the water is much too blue, with the angle of the sun, it should refract
more of the environments' color than blue.  In raytraced scenes I've done in
other packages, like Max or Maya, water is practically black, except for the
specular highlights (which are really just small inverted reflections).

** - just my two cents.


"Chris Purdy" <esc### [at] earthlinknet> wrote in message
news:3ce0022f$1@news.povray.org...
> I know I'm still learning... but I'm not understanding how I "overdid"
> it.... isn't povray just calculating the way the photons that are
reflected
> off the water would look?  I can remember times then I have seen this much
> caustic reflection off swimming pools near sunset.
>
> Is there a way to "tone it down"?  If I decrease the photon spacing, I get
> nasty speckles everywhere, and if I use a fixed number of photons I get
the
> same problem.. I stopped using a fixed number when I got up around
> 10,000,000 and started getting low on memory.
>
> Any of you photon experts, help!!! :)
>
> "Michael Goldshteyn" <mik### [at] wwacom> wrote in message
> news:3cdff195@news.povray.org...
> > Whoa, yes, they're cool, but I think you went a little overboard there,
> > especially with photons on the temple.
> >
> > Mike
> >
> > "Chris Purdy" <esc### [at] earthlinknet> wrote in message
> > news:3cdfbb6a@news.povray.org...
> > > Heres the (almost) final result of all my playing with photons this
> > weekend.
> > >
> > >
> > >
> > >
> > >
> >
> >
>
>

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That's sort of good, but the biggest problem is that the water surface is
unrealistically shaped, so the light effects that the photons create look
strange.

I suspect you're using bozo for the water's normal? I suggest you try
wrinkles and the f_ridged_mf function also and see what results you get from
those. I think those will make the water more realistic, and at the same
time make the photons more realistic.

It also looks like your reflection amount may be too high. Maybe not. I
dunno.

 - Slime
[ http://www.slimeland.com/ ]

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On Mon, 13 May 2002 09:10:50 -0400, Chris Purdy wrote:
> Heres the (almost) final result of all my playing with photons this weekend.

The water colour looks wrong and maybe it's just taste but the temple 
doesn't look textured either, softer and fewer reflections/caustics 
may look more realistic. 


-- 
#local i=.1;#local I=(i/i)/i;#local l=(i+i)/i;#local ll=(I/i)/l;box{<-ll,
-((I/I)+l),-ll><ll,-l,ll>pigment{checker scale l}finish{ambient((I/l)/I)+
(l/I)}}sphere{<i-i,l-l,(I/l)>l/l pigment{rgb((I/l)/I)}finish{reflection((
I/l)/I)-(l/I)specular(I/l)/I}}light_source{<I-l,I+I,(I-l)/l>l/l} // Steve

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"Slime" <slm### [at] slimelandcom> wrote...
> That's sort of good, but the biggest problem is that the water surface is
> unrealistically shaped, so the light effects that the photons create look
> strange.
>
> I suspect you're using bozo for the water's normal? I suggest you try
> wrinkles and the f_ridged_mf function also and see what results you get
from
> those. I think those will make the water more realistic, and at the same
> time make the photons more realistic.
>
> It also looks like your reflection amount may be too high. Maybe not. I
> dunno.

Yes, the water appears to be too reflective.  Realistic water should user
fresnel reflection with an IOR of 1.3.  A scattering media interior would be
great (don't use photons on the media, though, for speed reasons), but a
fade_distance and fade_color in the interior would be sufficient.

Here's a good tutorial:
http://www.schunter.etc.tu-bs.de/~chris/pov/water/

-Nathan

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Chris Purdy <esc### [at] earthlinknet> wrote:
> Heres the (almost) final result of all my playing with photons this
> weekend.

stop shooting!! - there already dead!!


--
Rick

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