"Dave Blandston" <nomail@nomail> wrote:

> There's a brief moment, I think around the two - three second mark, where the
> smoke from the burning engine doesn't appear to be blowing backward as fast as
> would be expected based on the speed of the passing clouds.
>

That's...entirely possible! ;-)  Getting the speed of everything to match up
took some doing (and COUNTLESS viewings of the animation.) Basically because the
camera itself *isn't* moving (in z), while everything else is. I used the moving
puffy clouds as a kind of 'standard speed marker' for everything else...they
were the first things I added to the scene, after the B-29. And since the black
smoke media has its own moving 'bumps' density pattern (and scaling, of course),
getting it to visually match the other scene movements wasn't exactly a walk in
the park. (In fact, I think I may have *cheated* it's speed, to look correct
even though it wasn't) But the speed doesn't change during the
animation--AFAIK!--so the odd glitch you're seeing *could* be just an effect of
the temporarily alignment of certain moving elements. Or the 'foreshortening'
effect of the slightly telephoto camera lens setting (compressing everything in
z.)

OR, I simply could have screwed up... :-[  My eyeballs got fatigued from looking
at this damn scene so many times. I'll examine my code to see.

KW

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