That's all you need to make the camera work, but we want to make a
fancier security screen. We made a separate window sill earlier, and now
it's going to come into play. Change the height of the sector containing
your viewscreen so you can see the window sill "step." While pointing at
this step in 3d mode, hit 'M' to make it a maskwall. A tile will fill the
space between the floor and ceiling. Point at this "wall" and change
its tile to a forcefield (tile #663). While still pointing at the wall, hit
'B' and then 'H' to make it blocking and masking, respectively. Switch
back to 2d mode, turn off grid-lock, and move the window sill corners and
window corners right up next to the wall. Switch back to 3d mode and adjust
the window sill height to match that of the window. Now you've got a
nice-looking screen that is recessed into the wall.
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