Not like radial wipe. Attached is a jpg of my challenge. To drop a part into a hole. As it decends into the hole it fades from view. I would like it to look realistic. For the meantime I used a linear blend even though ot should be circular (using the feather to fake as best I could but really doesnt look that good). I tried radial wipe and all the other transistions and they didnt work. I tried a mask but I didnt see a way to leave the mask where it is while you animate the object. The oval mask kept moving with the part dropping in. Thats probably the way to do it with a mask, but I need some help. Am I missing a trick?
There are a bunch of ways to do this. You could use a masked solid as a track matte, duplicate your bottom layer and make holes in it for the part to drop through, or use the pan behind tool (see the help files).
If you just need to curve things slightly, Bezier Warp will do wonders for you. For more complicated deformations, Mesh Warp, Liquify and the Puppet tool should get you there.
I am going to choose to clone the bottom layer and cut a hole in that. I am going to learn the other methods too as they may be easier. Thanks all!