>   I don't understand why clear water would change the color of the light.

Maybe not. But I'd expect some stronger visible changes inside the water.

> > If you used an isosurface, this
> > could be done with media (ohh, it's gonna be slow) but if you used a
> > heightfield, I don't know how.
>
>   There's no difference between isosurfaces and heightfiels in this
matter.

I mean, a heightfield doesn't have an interior, so how could media work?

>   But why use media when you can use a fading interior?

Guess I'd have to do more home-work reading the POV documentation!

Regards,
Hugo

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