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.

I got the idea that this could be done using pigment {function{}}, and 
it actually _works_   :O

I have it half worked out, it's slow, and I still need to layer the 2 
textures to create the final infinitely repeatable tile, but hopefully I 
will finish that up after I get some other stuff out of the way.

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