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I've always planned to add jellyfish, but came upon a major stumbling block when I went to the Long Beach Aquarium to study them in detail. The problem is that they can swim upside down, and spend about half their time doing so. There are many visual tricks at work in the program which are needed to give the illusion of reality, and one of them requires that no object rotates more than about 20 degrees on the Z-axis.
Eventually I'll solve this, but can't spare the time right now.
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