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I noticed this interesting phenomenon in real life, so I had to replicate
it with POV-Ray. It simulated the effect beautifully.
There are two identical glasses in the image, both of which have a paper
label around them. The glass on the left is empty, and the glass on the
right is partially filled with water. Even though the water is very
transparent, it nevertheless completely blocks the paper label from view.
This is caused by total internal reflection. And it happens in the same
way in real life.
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Attachments:
Download 'TotalInternalReflectionDemo.jpg' (81 KB)
Preview of image 'TotalInternalReflectionDemo.jpg'
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Warp nous illumina en ce 2009-05-25 14:21 -->
> I noticed this interesting phenomenon in real life, so I had to replicate
> it with POV-Ray. It simulated the effect beautifully.
>
> There are two identical glasses in the image, both of which have a paper
> label around them. The glass on the left is empty, and the glass on the
> right is partially filled with water. Even though the water is very
> transparent, it nevertheless completely blocks the paper label from view.
>
> This is caused by total internal reflection. And it happens in the same
> way in real life.
>
>
You JUST discovered it with POV-Ray? Were where you?
It jumpt at me the first I did a render of a transparent object with an ior, but
I hardly noticed as "it's correct" as, for me, it was an obvious behaviour.
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Alain wrote:
> You JUST discovered it with POV-Ray?
No. I discovered *this particular scenario* in real-life, and
replicated it with POV-Ray.
Post a reply to this message
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"Warp" <war### [at] tag povrayorg> schreef in bericht
news:4a1ae1a8@news.povray.org...
> I noticed this interesting phenomenon in real life, so I had to replicate
> it with POV-Ray. It simulated the effect beautifully.
>
> There are two identical glasses in the image, both of which have a paper
> label around them. The glass on the left is empty, and the glass on the
> right is partially filled with water. Even though the water is very
> transparent, it nevertheless completely blocks the paper label from view.
>
> This is caused by total internal reflection. And it happens in the same
> way in real life.
>
Nice indeed. Real life simulating POV-Ray... ;-)
Thomas
Post a reply to this message
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Warp wrote:
> I noticed this interesting phenomenon in real life, so I had to replicate
> it with POV-Ray. It simulated the effect beautifully.
>
> There are two identical glasses in the image, both of which have a paper
> label around them. The glass on the left is empty, and the glass on the
> right is partially filled with water. Even though the water is very
> transparent, it nevertheless completely blocks the paper label from view.
>
> This is caused by total internal reflection. And it happens in the same
> way in real life.
>
>
Very cool. In microscopy we use TIRF to illuminate an extremely thin
layer of a sample; in a bizarre twist of physics, the reflection
actually "extends" past the top of reflecting surface - in the case of
microscopy, the coverglass over your sample. This extension (called an
evanescent wave) is very thin - about 100um - which we use to
specifically illuminate the part of our sample in contact with the
coverslip.
I wonder if povray's physics are good enough to model that...
Bryan
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