If anything the reverse may be possible. Ha! That was a bit of sick
humor, sorry.
You or somebody has asked this before, I'm sure.
Trying negative color and reflection values will get you nowhere I
think, I've tried quite a few things like that anyhow and never have I
seen a object disappear AND be in a mirror, far as I know.
Considering the object has got to be transparent, the mirror would need
an opposing reflection.
Now I have to eat my words, because I tested it out just now carefully.
Take a render of the following:

// BEGIN
#version 3.1

camera
{
  location  <0.5, 0.5, -4.0>
  direction 1.5*z
  right     4/3*x
  look_at   <0.0, 0.0,  0.0>
}

sky_sphere
{
  pigment
  {
    gradient y
    color_map { [0.0 color blue 0.5] [1.0 color rgb 1] }
  }
}

light_source
{
  0*x // light's position (translated below)
  color red 1.0  green 1.0  blue 1.0  // light's color
  translate <-30, 30, -30>
}

// ----------------------------------------
plane { z, 2 pigment {color rgb -1} finish {reflection 1} rotate 5*y
translate 9*x}

sphere { 0.0, 1 texture {pigment {rgbt 1}} }

//END

Lance Birch wrote:
> 
> Um, don't get me wrong here, but if it's invisible to the camera directly,
> how do you expect it to cast reflections?  And, I don't think that you mean
> *cast* reflections do you?  Do you mean, it can be reflected by other
> objects, but you can't see it normally...  Like, you can see if reflected in
> an objects surface, but you can't see it in the scene.  In which case I
> think it would require a little reprogramming of POV-Ray...
> 
> (or some clever image editing ;-)
> 
> --
> Lance.
> 
> ---
> For the latest 3D Studio MAX plug-ins, images and much more, go to:
> The Zone - http://come.to/the.zone

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