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cutaway shader.. help??

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im trying to achieve a "cutaway" effect on my wall geometry using shaders, but running into all kinds of fun.. the picture should show what im after... anyone have a clever way of doing this?

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wait a minute, this can be done in a manner not unlike stencil shadows, right?

-render everything non-cutaway-capable normally
-render cutaway candidates to depth
-render cutaway volume to stencil using zpass technique (unlikely that the
camera is going to get inside the volume)
-render cutaway candidates again, where stencil == 0

have I missed something?

am i right in thinking that i can achieve the "border" by doing this again with a slightly smaller volume?

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