Cousin Ricky <ric### [at] yahoocom> wrote:
> This suggests that POV-Ray pre-assigned 0 to x. That this construction
> is given as an example suggests that this is a significant feature
> (however inadvisable to use), and not just a parser glitch. Shouldn't
> there be some explanation of this feature?
"All built-in vector identifiers never change value. They are defined as though
the following lines were at the start of every scene.
#declare x = <1, 0, 0>;
#declare y = <0, 1, 0>;
#declare z = <0, 0, 1>;
#declare t = <0, 0, 0, 1>;
#declare u = <1, 0>;
#declare v = <0, 1>;
It shouldn't be like you say. But by the trunk of the fifth elephant that it is.
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