I just noticed that some compositions I had from earlier use a Billboard
with no ³width² parameter.  The newer one does.  I had been animating an
image size and position within the Billboard.  It now looks like I should
have been doing that with the Billboard parameters instead, using ³width² as
the size parameter.  Is that the correct take on the situation?  Or maybe I
should be using a ³Sprite², because that is a more generalized Billboard.

However, in some cases, such as the one I mentioned in the previous post, I
have to use a screen-sized (uh, window-content-sized) billboard if I want to
dim everything except the positioned circle.
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