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:-bd

glad to see there are some very good solutions here.. mine was fiddly at best

experience will out :D

@acorn - that's good, but you can see the joins in your example, where the gradient suddenly changes [gary's point] - one solution would be a patch, same in the way I thought of above which is sort...

I would perhaps start out with a long rectangle with gradient

the fun bit, working out the angles at which to slice and splice where it changes direction...

great result with the stereogram :)