>>(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;

Oh, sure... V.t is a perfectly valid expression. But - unlike "x" / "y" 
/ "z", "t" by itself isn't a valid expression.

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