OK - I fixed the SDL so that the whole thing runs and renders, but the problem I
have now is that for some reason I'm not able to read the data out of the arrays
I've created.

It's weird, because the loop in the macro that plots out the sphere sweep works
just fine, but then all subsequent attempts to do exactly the same thing fail -
I get 0 for my array values.

What should I be looking for here?

(BTW - how do I directly output a vector to the debug stream?)

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