The first few Horus Heresy novels are worth reading. At the very least the first one by Dan Abnett, IMO the best 40K author.

It’s not space marine related, but I highly recommend the Eisenhorn Omnibus!

Wow, thanks to that article TIL about the George H. W. Bush vomiting incident

Maybe you’re looking for lerp()?

Given two vectors and a value between 1.0 and 0, it’ll produce a vector at a point between the inputs.

https://docs.godotengine.org/en/stable/classes/class_vector2.html#class-vector2-method-lerp

This is a game changer.

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I think you might be talking about Flash games. Here’s an article that summarizes Flash and what happened to it:

https://www.techspot.com/article/2413-adobe-flash/