I'm so so happy that I have found your channel, it's super useful and I can learn lots of new things about Ae. I wish you can update more and more tutorials like that in future. I'm looking forward to seeing more video from you. Thank you so much
Pre-comp your donut with bites and add "Simple choker" to the comp. Set the expansion to a negative number and then add "cc Composite". Change the "Composite original" mode to silhouette alpha and you should see an outline. Add a fill effect to this outline and change the expansion to tailor it to your needs.
What is the food you are trying to make appear to be eaten is a Pre-comp itself? I tried this with a video I was putting together and the track matte wouldn't work correctly.
