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Select your position keyframes, right-click on one of them, choose "keyframe interpolation", and set the spatial interpolation to linear. You may want to make that your default setting in the Preferences.
Steve is right.
The jargony term for this behavior is 'boomerang' animation.
The top several search results here are for pages that can help you to understand what's going on.
Or you could just jump straight to the "Controlling change with interpolation" section of the (supposedly horrific) After Effects CS3 Help on the Web.
i went to AE>pref>general> and checked on my spatial interpolation to linear.
for some reason that didnt do anything.
although then i tried highlighting the keyframes and chose keyfame interp and then did it from there and that helped :) thanks.
does anyone know why the AE pref didnt help change this?
also why do they have the animation settings set to having it off in the first place? what would leaving your plot destinations help in an animated situation? thanks
That should work on new keyframes created, not converting existing ones, Michael. What you want to do is select the keyframes (before and after the 'weirdness'), and right click, keyframe interpolation/ Sparial/Linear.
The Preferences setting will only take effect on keyframes that are created AFTER the preference has been set. Keys that were set prior to changing the preference will need to be altered manually.
As for "why"... I'm not sure.
I usually always set that preference when launching AE for the first time, and then I change my spatial interpolation as needed for any given animation. Perhaps more people prefer it the other way.
If you would like the option checked by default, perhaps add a feature request:
*edit - Beat to the punch by David. :)
>also why do they have the animation settings set to having it off in the first place? what would leaving your plot destinations help in an animated situation?
If you plan to animate your layers in something other than straight lines or paths with sharp corners, you would want your spatial interpolation to be set to bezier. I suppose AE's designers thought the hassle of having to enable bezier interpolation in those cases would outweigh the hassle of disabling it in cases like yours.
yea i figured it was for the others after that are affected since after i checked the setting on there was no need to render anything, because nothing changed.
thanks everyone for that information you all were a real help :)