Make a checkered plane. Put a camera above it.  Make a transparent plane above
the camera with ior 1.33.  Point the camera up.  You should see where the
critical angle is reached.

In real life the area where TIR is reached is a little more gradual, I think,
so it might not be completely accurate.

-Mike

Anders Haglund wrote:

> Hi everybody.
>
> I just wondered if povray can do absolute reflections? you know, when light
> goes from a dense medium to a less dense medium in a high angle the light
> bends so much it becomes a reflection instead of a refraction... If it
> doesn't support it... well, then it should because it's no hard math and
> it's pretty common...
>
> /Anders

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