William F Pokorny <ano### [at] anonymousorg> wrote:

> That, today, only happens when you somehow invoke the rgb to grey
> functionality as with .grey, output to grey, etc. If you code
> function { pattern brick } what that function returns is the single
> pattern value that would normally be used to drive the *map.


> The v.zyx syntax has a name - like twizzling or something - and it's
> offered in some C++ vector template classes at significant complexity to
> those

Swizzling - yes that rang a bell, and a search confirmed.

Given the above .gray / .grey capability, I must admit it's a bit surprising
that .yzx would be more complex than either of those or .hf.

I will need to look at the source - wherever that might be.

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