Thank you both for your efforts, but unless I am misinterpreting the suggestions I think I will have to get a bit more specific. See image.
I only mentioned the shape layer to keep my explanation simple, but the reality is a bit more complex. I am looking to get shadows on the edges of a comp with ~30 layers with animation, without the shadows showing through the transparent parts.
My attached example uses 3 copies of that comp to get the alpha shadow, then the normal comp over top again. Which is more taxing than it needs to be when previewing and I’d rather not go through the steps for each separate future animation. I’ll do it if that’s the only way, but I feel there’s something I’m missing to make it simpler.
There is no 3D being used, I’m simply using renders from C4D and some creations within AE.
Thanks for your time.
shadowsample.jpg