A number of times I find that I would like certain objects to be
anti-aliased, but not the whole scene, or for some objects to be
anti-aliased at a higher level than the rest of the scene.

What would be the difficulty in programming anti-aliasing regions, such that
any pixel whose ray was shot into the region would be anti-aliased at a
certain level?   I picture syntax such as:

antialias {
  box { <-1,1,1>,<2,4,4> }
  depth 3
  precision .1
}

This would have the effect of forcing anti-aliasing to higher levels for
those pixels that covered the bounding region (unless AA was shut off
entirely).

This way a finely detailed object would always get the AA it needs to avoid
having parts left out (because a part falls between the rays of neighboring
pixels).

I can see that this would be tricky to implement with sampling method 2.

What think ye?

Regards,
John

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