I've created a model of flapping wings.  There are ribs, with bicubic
patches forming the 'skin' between the wings.  The wings are generated with
a macro that takes "spread" and "flap" values to determine their position -
which can in turn be based on the clock.

What I'm trying to add now is a way to have the 'skin' stretch as if
experiencing wind resistance.  To do that - I need someway to know the
motion of the wing (i.e. up or down) but I'm stumped about how to do this
since each frame is rendered individually.  Is there an easy way for me to
track what the last frame rendered was, so that I can then determine which
way to stretch the bicubic patch?

Thanks all!

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