the point is of course to fade the character, not the reflectivity of the mirror: when the char fades in the mirror it reflects more of the environment.

personally I'm a "never do in 3D what can be done in 2D" person, so my initial idea would be to render twice; visible to raytracing ON and OFF, and merge them at will by overlaying both layers in the video editor. This way I can alter the fading speed / moments without any re-rendering and almost interactively. I can even make the character and its clothes fade at different rates (3 re-renders), and so on.

Any Poser scheme seems quite elaborate to me, require a lot of testing / re-rendering, etcetera. We'll see if anyone comes up with something.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though