Im having an issues with Gaps in between my masks. Im trying to create an Unfolding effect on a comp. I have a shape and text in a 3D comp, then I am creating a mask of an area of the comp and animating it, then duplicating it and moving the mask so that the entire image is revealed after the animation. I have attached some pictures of the result Im getting.
Specs: Macbook Pro 2013 Retina 15" 16GB Ram 2GB Nvidia 750M 512GB SSD
After Effects CC v126.96.36.199
Do the folding in a separate comp and use the Alpha add blending mode on teh layers. Also check Mask feather and expansion.