could be to fill in pool and you see garbage floating by
or acid with bubbles
decorative so no need to make it like water
could give some groovy efects in tunnels or
one thats shows arrows moving
or moving wall like wind in sail
or i stripe of light that follows the tunnel like in spaceship
o
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or steampunk stuff moving on it
insects infected moving around
These effects could be achieved with animated decals, which I believe just recently got announced.
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you know where it got anounced?
Here.