Le_Forgeron wrote:

> There is an issue inherent with such pattern: ulterior transformation
> cannot affect the reference direction. which means that rotating an
> object actually changes its appearance.

Yes, it's the same with the slope pattern. Also, the slope pattern
supports both vector and point source in 3.7, so an alternate vector
mode for aoi would not be completely unexpected

   aoi {relative_to <vector>}?

But I have no objections to "aov" as well.

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