Wasn't it Kaveh who wrote:
>Slightly off topic, but I am not sure this is the correct way to find
>the interference pattern. I am still racking my brain. It seems logical
>to take the amplitude of each wave, and add them up at each point. But
>when I take the path difference first, by subtracting one path from the
>other, and then using the sine of that path difference, I get a
>different pattern, and one which looks more correct, i.e. continuous
>curved lines. I will think more on this.

Doing it my way, you get a snapshot of the true situation, like what
you'd see with water waves. Since light waves travel faster than you can
see, you probably want to sum this over 
               sin(Dist1 + Theta) + sin(Dist2 + Theta)
for Theta varying from 0 to 360. 

I don't happen to know how to solve that.


>Now how would I get this pattern through a volume, e.g. a cube? I want
>to see the strata running through an object, i.e. 3D fringes. I now get
>the pattern only on the surface. I tried using interior_texture, but it
>didn't work. 

I think you can use media, and use the function as a density_map.

-- 
Mike Williams
Gentleman of Leisure

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