As far as I've understood the docs, doing a .x or such, like Vector.x, would
not return a "handle" to the X-Component of the Vector, but actually return
the value stored there. So Vector.x actually IS a value, not a reference. If
the Vector would be <1,1,1>, then
#declare Vector.x = Vector.x/2;
would be like
#declare 1 = 1/2;
which obviously wouldn't work (on a logical basis, not sure how the parser
handles that).

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
Email: tim.nikias (@) nolights.de

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