Splat 2D/3D functions about openscad HOT 7 CLOSED

Looks like it's also missing in the CheatSheet. It's not in the release version, only dev snapshots have it.

Created #5084 as reminder for the documentation.

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Use swizzling:

v = [1, 2, 3];
echo(v.xx); // ECHO: [1, 1]
echo(v.yyy); // ECHO: [2, 2, 2]

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I'm struggling to find documentation on this feature (and in general, actually). It's been hard to search for things because WikiBook's search doesn't limit the scope to the user manual.

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Reflecting, I don't think swizzling helps here. I'm not starting with an existing vector, I'm trying to create a new vector from a number literal. I could see this maybe being helpful if I had a set of numbers I was going to splat from, but I'd be limited to only vectors with a length of three, and so I'd have to create ceil(N / 3) vectors.

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Perhaps [val].xx and [val].xxx

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echo([3].xxxx);
echo([for (n = [0,2,5,7,9]) [n].xxxx]);

The output limit for swizzling is 4 (inputs are xyzw and rgba).

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Ahh, ok. I misread the docs on dot-access notation, and inferred that it wouldn't work on other-sized vectors.

This looks like it's sufficient to not need splat functions, thank you!

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