I believe the precise term is "anti-vampire".  I was told a year or so ago
that it cannot be done........

Rick [kitty5] wrote:

> Hi all,
>
> Just wondering is it possable to make an object interact with a scene, but
> invisable to the camera, imagine..
>
> a reflective checker plane (tis hard i know) a reflective blue sphere next
> to a reflective green one.
>
> the feflections of the green sphere are on the floor and the other sphere
> etc, yet the green sphere is just not there.
>
> and how...
>
> Rick

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