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And Liquid Nitrogen flows UP and not down...but you are right about mercury.....
Equiprawn wrote:
> Hi,
>
> >reflected caustics on the glass (you _can_ see them, can't you?
>
> Yes! Don't worry, I can see them.
>
> >The glass itself is simple CSG, needs some work. I feel there is something
> >wrong with the refractions (at least upper part, where top of the wiskey
> >meets the glass).
>
> I might know what this is. If you fill a clear glass with water, and look at
> the top where the water's surface meets the glass, you will see that the
> surface doesn't stay flat, but in fact curves up slightly. This happens
> because of water tension, and in fact happens with all liquids, AFAIK. The
> only exception I know of is liquid mercury, which curves down instead of up.
>
> Very nice image!
>
> Equiprawn
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Nathan Kopp wrote in message <36F### [at] Kopp com>...
>Usually, I make the liquid a bit bigger than the interior of the glass.
I can't see why it should be better. Surely the reverse holds true in
nature. In raytracing terms - overlap or not, the surfaces are nearly
coincident so the change in reflection/refraction vectors should be
negligible. And I have gotten correct results with the liquid smaller than
the glass.
Anyway, I'll try. But if this works better, I'd like to know why...
Margus
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Ahh, I see what you mean now. You're right, it does look a bit strange. A
bug in Povray?
Equiprawn
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Very nice picture!
Here is a picture that is going to put renderman and its shader to shame.
I especially like the caustics of the whiskey. What a shame you did not work
more on the 'floor'.
I do hope that the photo mapping feature will be included in the next release of
POV.
> OK, you've already seen caustics with blobs, trees, birds... But have you
> seen the caustics of a fine glass of liquor...? You have? Well, have some
> more!
> This damn thing took 30 minutes to parse and 17 hours to trace on my
> PII416/64MB - mainly because reflections, but also because I turned on
> reflected caustics on the glass (you _can_ see them, can't you?). Also, AA
> had to be set to 0.1
> For my next feat, I'll add some ice cubes (with media interior, reflections
> and caustics), add reflections/reflected caustics to the whiskey and remove
> "ignore_photons" from the glass. Then I'll take a nice 3-year vacation in
> Burundi and hope to see it ready when I get back...
>
> The glass itself is simple CSG, needs some work. I feel there is something
> wrong with the refractions (at least upper part, where top of the wiskey
> meets the glass).
>
> It used 481,317 photons (overkill?), density .015, radius .15,2,.15. Whiskey
> had refraction on, the glass had refrection & reflection on and
> ignore_photons set.
> I can only hope that the bright splotches are caustics from the
> ornamentation on the glass.
>
> Margus
>
> [Image]
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Hmph. It does work! Both the refraction and the caustics look completely
different... But why? Total internal reflection?
Margus
Margus Ramst wrote in message <36f115e9.0@news.povray.org>...
>
>I can't see why it should be better. Surely the reverse holds true in
>nature. In raytracing terms - overlap or not, the surfaces are nearly
>coincident so the change in reflection/refraction vectors should be
>negligible. And I have gotten correct results with the liquid smaller than
>the glass.
>Anyway, I'll try. But if this works better, I'd like to know why...
>
>Margus
>
>
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Yep, does look strange at the liquid/solid barrier (fancy terminology
for whiskey meets glass), since you've stared plenty enough at such
objects you must know what you're talking about.
No one else commented on the darkness of the shadowed liquid. I would
expect to see the golden color on the table surface beyond just the
photon mapped part. No?
Margus Ramst wrote:
>
> OK, you've already seen caustics with blobs, trees, birds... But have you
> seen the caustics of a fine glass of liquor...? You have? Well, have some
> more!
> This damn thing took 30 minutes to parse and 17 hours to trace on my
> PII416/64MB - mainly because reflections, but also because I turned on
> reflected caustics on the glass (you _can_ see them, can't you?). Also, AA
> had to be set to 0.1
> For my next feat, I'll add some ice cubes (with media interior, reflections
> and caustics), add reflections/reflected caustics to the whiskey and remove
> "ignore_photons" from the glass. Then I'll take a nice 3-year vacation in
> Burundi and hope to see it ready when I get back...
>
> The glass itself is simple CSG, needs some work. I feel there is something
> wrong with the refractions (at least upper part, where top of the wiskey
> meets the glass).
>
> It used 481,317 photons (overkill?), density .015, radius .15,2,.15. Whiskey
> had refraction on, the glass had refrection & reflection on and
> ignore_photons set.
> I can only hope that the bright splotches are caustics from the
> ornamentation on the glass.
>
> Margus
>
> [Image]
--
omniVERSE: beyond the universe
http://members.aol.com/inversez/homepage.htm
mailto:inv### [at] aolcom?Subject=PoV-News
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Hickough.... ;-)
Now this is what I call realistic...
Markus
--
Ich nicht eine Sekunde!!!" H. Heinol in Val Thorens
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test
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I ran into this problem when I was creating some illustrations for an optics
paper I was writing. I found that the container for the liquid must be 0.01
smaller than the glass container it will be inside. If you dont do this
Snell's law doesnt hold. Hope this helps.
Kynar
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Kynar wrote:
> test
Passed
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