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"WaveMaster" <nos### [at] yahoo com> wrote:
> The following example of a 3D-fractal animation does not work as expected.
>
> The animation rotates a 3D-fractal around the y-axis. When you render the
> animation (25 fps), you will see a 3D-fractal, rotating around the Y-axis,
> but additionally you will see an inner move/flow of the fractal itself.
> This inner-move makes a jump in speed and direction when you reach a
> special position. This happens between frame 535 and frame 536 of an
> animation with 4000 frames.
> Between frame 535 and 536, the inner-move of the fractal is suddenly
> increased
> and the direction of the inner-move is reversed. Too see this effect, render
> an animation from frame 500 up to frame 560 with a resolution of at least
> 720x576 with Anti-Alias 0.3 on. (PovRay 3.6.1.c Windows version)
>
> How can I suppress/avoid this strange change in speed and direction of the
> inner move/flow of fractal ??
>
> Is there an error in the 3D-fractal calculation ??
Hmm, this might just be nonsense spouting, but my theory is that it's the
Western-movie effect: any chariot/wagon's wheel which moves by more than
half the distance to the next spoke (in a single frame), will look like it
turns in reverse. You are scaling your object more in x than in z, which
means the rotation rate will appear to be non-uniform. If you scaled it in
the same way on all axes the effect might disappear.
Oh, and stones.inc already calls stones1 and stones2, btw.
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