When we saw that building effects using rigging in Motion was possible, we didn't think it would be long before more complex designs were posted. This aperture effect is a good example.
Now that users have had time to experiment with the effects building capabilities of motion, some really cool looking examples are starting to be shared on the internet.
If you haven't taken a look already, we are compiling a list of free effects on our forum. Free FCPX effects
Back to the camera lens aperture effect.-
Butch Mahoney has posted this camera aperture effect. It's not a transition so you'll have to position it over two clips and then manually keyframe the animation. It's a good example of how more complex creations can be built in Motion using rigging.
Download Camera Aperture FCPX effect