make "on" water turbine animated!

This uses a fairly simple trick: the textures are animated, while the
model is static and has a number of rotated copies of the parts that are
seen to move (four copies of the blades, eight copies of the top/bottom
and their edges).  The opaque parts of the textures then decide which of
those faces' copies are visible in each frame.
This commit is contained in:
Vanessa Ezekowitz
2017-02-12 13:57:30 -05:00
förälder fa3bd19270
incheckning 46cbc76988
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