Am 04.11.2018 um 21:19 schrieb Anthony D. Baye:

> The only problem I foresee with the reverse lookup is that it uses a matrix
> transform which I'm unsure about how to implement in PoV SDL. That is, without
> implementing a matrix math macro library.

Implement it as a matrix transform, and make use of the `vtransform()` 
function?

You wouldn't even need to figure out the inverse transform matrix 
yourself; just make use the `inverse` keyword.

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