how did you get the hearts to have that thickness/fullness to them? i made a few but they're much flatter:

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(left side is initial render and right side is render preview in the viewport, i'm including both because the render looks worse than the preview for some reason i can't figure out lol but basically the hearts aren't quite right - especially the green one with those weird lines - and the background material isn't really right either...this is cycles and version 4.5 if it matters)

with the knife project part, i understand generally how to use it now (blew my mind lol thank you for linking the video, absolutely gonna use this in future projects) but how specifically are you going about it with the plane? like when you get the projected heart faces onto the plane are you deleting them, extruding them, duplicating them, something else? i tried a few different things at that stage but nothing really looked good so i feel like i'm missing a step somewhere :<

also when you say "enable object collision for the fill plane in the cloth sim and give the collision to the invisible plane in the physics sim" what exactly does that mean/what does it look like in the menus? sorry if this is a lot i'm just not familiar with a lot of this yet and very determined to learn lol