I implemented a variable blur similar to the effect Apple uses throughout iOS as a metal shader and gave it a #SwiftUI wrapper that lets you control the effect with a mask to create all sorts of effects
On GitHub as a #Swift package: https://github.com/daprice/Variablur – I'll give it a better readme sometime, but for now you can use Xcode's documentation viewer and previews.
Thanks to @twostraws's Inferno project and tutorial for inspiring me to try this!
