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

motion of the wing (i.e. up or down) but I'm stumped about how to do this

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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