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Bald Eagle <cre### [at] netscape net> wrote:
> On 3/7/21 11:18 AM, Robert McGregor wrote:
>
> > Yes, it means swapped diagonally:
> >
> > upper left and lower right swap places
> > lower left and upper right swap places
>
>
> I figured it out - but it is NOT like scale <-1, -1, 1>.
> the quadrants are swapped by _translating them, and then the middle
> cross gets filled in to make the empty edges all nice and pretty.
Yes, that's it exactly :)
Of course all seamless tiles are still noticeable as being tiled when they
repeat too many times, but I usually use a pigment pattern to break that up by
using different scales and rotations within the map (sort of what I'm doing for
the ground plane in the beam tower material test renders, using a bozo pattern,
but with two different image maps).
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