"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:
> > (B) is that same image with quadrants offset diagonally (this is
> > important for tiling).
>
> And this is the part where I always get lost with the tiling thing.
>
> I recall seeing a good tutorial on how to "do this with any image" back in like
> 1995, but when I searched recently, all I got was very unhelpful, overly
> complicated methods.
>
> Does quadrants "offset" diagonally mean _swapped_ diagonally?
> Like scale <-1, -1, 1> ?

Yes, it means swapped diagonally:

upper left and lower right swap places
lower left and upper right swap places

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