I'm assuming the blue dot is a shape layer. You will have to zero out the shape position property so that the dot is directly over the anchor point of the layer.
Yeah, I can manually readjust the anchor point for it to paste correctly into place, but should it not paste in place since it was created on the same layer (same dimensions, anchor point, etc?). Ultimately I do not want to have to do any adjustments after the fact, just paste from mask to position.
The layer dimensions and the comp dimensions must match. The pixel aspect ratios have to match, too. If they don't, problems ensue.
Here's the basic steps for perfect mask path or shape path to motion path.
- Create a new solid or use the pen tool to draw a path on a new shape layer
- If you chose to create a new solid use the pen tool to draw a path
- Unbreakable rule: the layer must be at the default position, rotation and scale value
- Press Alt/Option + m then Ctrl/Cmnd + c to set and copy a mask path keyframe
- If you are using a shape layer press the u key twice to reveal the shape path then set and copy a shape path keyframe
- Select your target layer
- Make sure that the anchor point is located exactly at the center of motion you desire for that layer
- Press Alt/Option + p then Ctrl/Cmnd + v to set and paste position keyframes
This works every time. If the layer containing the mask path or shape path has been scaled, repositioned, or rotated the motion path will not ever match the original path.