Right now, I'm trying to find a way to make something opaque to someone, and not to someone else. I'm wondering if any of the built in variables (luminosity, see_in_dark, etc) will be of any use? I'm not entirely sure what I can use to get the effect that I want, and ideally, I don't want to have to write my own opacity handling.

I looked around on the forum a bit, but I couldn't pull anything up, so if anyone has something else they've seen that would be helpful, that'd be cool too.

There are two things that comes to my mind:

1) invisibility && see_invisible (or something similar to that)

2) /image. Create an /image of the person at the location and show it to people who are suppose to see it