HEEEEELP!!! 2004-02-29 - By Eric Lampi
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Hi Michael,
After throwing myself out the window (we're on the
first floor) I brushed myself off, ignoring the
shocked looks of my co-workers, and MBed it in AE.
Not as good but in a pinch it will have to do.
I looked at the scene, while it's gone in frame 69, if
you go to frame 12, quick preview, advance a frame,
then back, the same thing happens.
We've managed to reproduce this problem, and
alsonoticed a regular pattern that seems to be tied to
the playback rate. In this case it's 29.97. It seems
to be a rounding error in the way it calculates the
playback speed and the particle's motion. It seems as
thought the math just isn't accurate enough resulting
in the occasional, but regular error.
It was almost certain that it would happen about every
12 frames, or some multiple of 4, but in the tests I
did, it happened on 8, 12, 24, 25, 47,48 and even 200
on a guess. As long as the playback rates are whole
numbers it probably isn't very common, but obviously
this is a problem if you have to work in NTSC. I can
only guess that the seed number just the frequency of
the problem, but it isn't really a fix.
Thanks for taking the time to look at it, I appreciate
it. Who at Soft should I send this to? Assuming that
everyone over there is enjoying a relaxing weekend
away from a computer.
Now I just have to do something about that broken
window and my new found reputation for being a
nut-case.
Eric
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Freelance 3-D Animator, F/X Artist
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