On Tue, 09 Nov 2004 20:14:17 +0000, Andrew the Orchid <voi### [at] devnull> wrote:
> (I understand not being able to use "x", "y" and "z", but "t"? That's 
> not even *valid* as a token by itself...)

http://www.povray.org/documentation/view/3.6.1/229/

  VECTOR_BUILT-IN_IDENT:
       x | y | z | t | u | v

and later

  2.2.1.4.3 Operators

and then try

#declare V=<1,2,3,4>;
#declare Vt=V.t;

ABX

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