I think that someone mentioned this point before, but I'd like to
discuss this subject more precisely:
In POV-Ray, cyclic animation means that the last frame of the
animation is skipped, and the clock values calculated accordingly.
That's, however, only the one point, but when introducing this in in
the AnimPlugin, the second and the second-last key have to be copied
too. (at least in cubic interpolation mode, but who'd use something
else?)

Example:
Let's imagine that you want to make a ball roll a circle. You'll need
four keys for this. One (first frame) at the start-position, another
about a third along the circle, the same for the third, and the fourth
(last frame of the animation) at the start-position again.
However, when you render this, you'll be disappointed, as the ball
doesn't roll along a circle, but along a raindrop-like shape.
That is, of course, as for the first and last cubic interpolation, one
of the three surrounding keys is missing and thus, the ball starts
straight.
The "cyclic animation" feature should imaginarily extend the animation
so that the second key can be copied behind the last one, and the same
for the second-last key, which has to be copied beore the first one.
Well, it could even copy the first key to the last frame
automatically, and leave the last frame out (what POV-Ray does too).

You'd get nice looping animations in no time then.

Please think about it!

    Florian

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