You can use the Noise patch and look up into the noise field or use
the Random patch with "Use Perlin Noise" as suggested which is the
default. This was changed in Leopard to address this particular issue.
.xX
On Jul 7, 2008, at 8:43 AM, Christopher Wright wrote:
I was wondering if you had the Random patch in the Iterator. It may
be
acting like it is getting "invoked" by each new iteration of the
sphere.
If that was the case, there would be no coherence. His composition
was mostly coherent, but would occasionally jump as though the
random patches were re-seeded (which doesn't happen under normal
circumstances for the lifetime of a given random patch).
Try having the random patch outside the iterator and brought in as
a value.
That way the deviation will be less 'random' and give you the
slight changes
you want. Sounds like it is getting initialized as a new object
each time,
so the random seed makes the randomness much greater -- it that
makes sense.
With the random patch outside of the iterator, each iteration will
fetch the same value -- not quite what he wanted. He needed a
different but coherent value for each frame, to make random trails
of spheres (similar to that one iTunes visualizer). The random
patch never gets reseeded -- it gets a seed when you drag it out of
the Patch Creator window, and then it keeps that seed forever. Copy/
Pasting it will clone the seed for multiple random patches, but
that's the only seed control available short of editing the
composition with a plist editor. I'm not quite sure what was
happening with his composition.... it wasn't a per-frame or per-
iteration seed change (that would produce totally chaotic motion),
but every few seconds the whole random output would jump uniformly,
as though a new random patch was used (a seed change, as you
mention). Not sure...
As an alternative to everything, he could use a Queue patch, and
simply store the random's output in a queue -- that way, the random
number patch doesn't get invoked several times per frame. Not sure
if that would alter its behaviour (would be interesting to know).
--
[ christopher wright ]
[EMAIL PROTECTED]
http://kineme.net/
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