hey! I'm using Decals, which is why I had to spend a bit updating the project, as I initially built it in compatibility mode and Decals are a Forward+ Only feature. I put the Decal's center right below the feet of the main character and set the Upper fade to a very high number and Lower fade to a lower number. This makes it so that the decal only fades in and out, in terms of color, when something is getting closer or further from the decals lower half, in this case the player character's feet
🚫🦷⚫⏩⏪.