Yes, I found out the same thing just before I read this post... :-)
I didn't try filter in the beginning because I thought this would let only the
red component of the ground through,
as Color 0 is Red...
I don't think it is a bug because when I took a very close look I could see the
texture below in the dark... it seems to be scaled down in color or something,
but in the end it's just too dark...

I had the same effect when I just used a simple checker :
texture {
pigment {
checker color rgbt <0,0,1,0>, color rgbt <1,1,1,1>
}
}

But filter works and I'm happy again :-)

Thanks,
Hendrik Iben

Bob Hughes wrote:

> I think you may have found a bug.  'transmit' doesn't work right but 'filter'
> does okay.
>
> Bob

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