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Are you editing the bezier path on a mask or on a spacial path? or on velocity curve? Is it a broken curve? (opt-click/drag)
Like Ko, I'm not entirely sure about your description, but you may want to apply the "Separate XYZ" animation preset (this creates separate transforms for each channel, and allows you to edit them individually in the graph editor), and preform your transformations using the preset instead of the built-in positional property. Admittedly, it would be nice if this was a native feature of AE, instead of having to use an animation preset to separate channels.
I am using the graph editor, adjusting the spatial graphs. I get "bumps" in the motion as I cannot use beziers to match forground motion to the spatial graphs of the background. And I cannot get enough detail or accuracy (to match the background) when using the beziers in the monitor window.
I am moving two stills in relation to each other. One background still is set for a desired xy motion. Then a 2nd forground image is moved on top as if a camera on a dolly were moving circuitously in.
I can't get its xy motion to smoothly match without bumps or hesitations -- even using lots of keyframes.
Steve may be right that I need to use 3D processing since the background and foreground are creating a 3D like effect.
It is just that I expected the default XY should be more powerful for being so basic to all motion. That's why I bought AE.
As Steve said, apply the "Separate XYZ" animation preset and you will have discreet control of each axis in the Graph editor.
I have applied Separate XYZ. When I try to match another curve in the graph editor it keeps selecting the wrong graph. I.e. when two keyframes are on top of each other it "auto" selects the other XY line, even though I've already selected the X.
Is there any way to move the values from the old XY graph to this new X and Y position graph?