Trying to create a special version of a split screen here for a music video & wondering if Motion can be of use...
I want to use 3 instances (maybe more) of the same clip layered like this:
The center piece is the original frame size with left and right copies being independently scaled up and repositioned as desired... Being able to manipulate scales, split positions and angles & drop shadow parameters would be awesome!
Can a FCPX effect built in Motion layer more than one copy of the clip it's applied to?
Yes, you could easily build an effect, or series of them in Motion that could do all of the things you asked. Basically, what you would do is create a new Final Cut Effect in Motion, select the Effect Source layer and clone that two times (or as many times as you need for your slices. For each clone layer you would scale it up apply a mask and define the shape, then enable the Drop Shadow options on the clone layer and adjust those. If you need the mask move/scale independent of the video, you could move each clone layer into a group and mask the group.
Once you have the basic composition, you could set up and publish rigs or just publish the required parameters for adjustment in FCPX. Then just drag the custom effect on your clip and adjust things to taste. Motion is great for creating reusable effects like this.