This was a response to someone's question, but I thought I'd make a single post so that if someone searched for idea by title only, they could find it.
"Original File"
3D_DropShadow.veg
It's a little easier to do it from scratch, but what you want to do is add a child track to each track in my original file that has media in it, and move the media to that new child track, leave that track in 2D, and then squeeze the footage in that track (by using the pan crop tool or track motion on the 2D track, your choice), and then add a 2D drop shadow to that new child track that you just moved the media to. From there, you will need to make sure that the shadow doesn't go out side of track "window" so to speak. (If you don't squeeze the footage in the track, you won't see any drop shadow because each 2D track that is a child to the 3D positional track is only a certain size)
A couple of things to watch out for is when you add a track sometimes that will kick the 3D track that the media is in back to a compositing mode of source alpha rather than retaining that 3D Source alpha that you gave it initially. Also, You want to make sure that the parent compositing mode of the parent tracks (found on the left of all tracks that are parent tracks) are set as a compositing mode of 3D source alpha along with the track compositing mode and that you do all your positioning of the master 3D source alpha in that parent track position if you're making a child track that has your media and you're adding a drop shadow to that.
If you're just using the media in 3D positioned tracks w/o the child tracks for adding your drop shadow, then you can position each one at the track level track motion and make sure that all the tracks are set to 3D source alpha track motion and be sure that parent track that they are all children to is set to 3D source alpha at the track compositing mode level, and the Parent track compositing mode settings found on the left of that parent track.
Hope this helps :)
Dave
"Original File"
3D_DropShadow.veg
It's a little easier to do it from scratch, but what you want to do is add a child track to each track in my original file that has media in it, and move the media to that new child track, leave that track in 2D, and then squeeze the footage in that track (by using the pan crop tool or track motion on the 2D track, your choice), and then add a 2D drop shadow to that new child track that you just moved the media to. From there, you will need to make sure that the shadow doesn't go out side of track "window" so to speak. (If you don't squeeze the footage in the track, you won't see any drop shadow because each 2D track that is a child to the 3D positional track is only a certain size)
A couple of things to watch out for is when you add a track sometimes that will kick the 3D track that the media is in back to a compositing mode of source alpha rather than retaining that 3D Source alpha that you gave it initially. Also, You want to make sure that the parent compositing mode of the parent tracks (found on the left of all tracks that are parent tracks) are set as a compositing mode of 3D source alpha along with the track compositing mode and that you do all your positioning of the master 3D source alpha in that parent track position if you're making a child track that has your media and you're adding a drop shadow to that.
If you're just using the media in 3D positioned tracks w/o the child tracks for adding your drop shadow, then you can position each one at the track level track motion and make sure that all the tracks are set to 3D source alpha track motion and be sure that parent track that they are all children to is set to 3D source alpha at the track compositing mode level, and the Parent track compositing mode settings found on the left of that parent track.
Hope this helps :)
Dave