It is possible with official POV, with manual bounding.
Just bound the floor with a tiny sphere near / around the camera. Now, the floor
shows up only in direct camera rays. Note that the floor would currently not
cast shadows. If you want it to cast shadows, you should add a small bounding
object near the light source(s) too.

It's easier in MegaPov, which has the no_image and no_reflection keywords. They
work the same way as no_shadow.

Margus

Lutz Kretzschmar wrote:
> 
> Hi POV-gurus,
> 
> A Moray user asked me whether it was possible to create the following
> effect:
> 
> he wants to create a scene with a floor and a number of reflecting
> objects. The objects should not reflect the floor, however, they
> should only reflect each other. Is this at all possible? I pretty much
> assume it's impossible with the official 3.1, so I'm wondering whether
> MegaPOV or SuperPatch or any other patches would allow this.
> 
> Thanks,
> 
> - Lutz
>   email : lut### [at] stmuccom
>   Web   : http://www.stmuc.com/moray

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