ThyOwen

I've started some initial work in [this branch.](https://github.com/ThyOwen/OpenShadingLanguage/tree/add-testrender-volumes) It's still in its early stages but just wanted to update the thread.

Thank you for your response. There are some other projects with similar build issues and all of them use alternative build... whatevers with `Atomics`. #https://forums.swift.org/t/exc-bad-access-instantiating-atomic-primitives/65909/2 #https://github.com/apple/swift-atomics/issues/86?ref=https://coder.social #https://github.com/tuist/tuist/issues/5794