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Cousin Ricky <ric### [at] yahoo com> 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?
https://www.povray.org/documentation/3.7.0/r3_3.html#r3_3_1_6_6
"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.
B. Gimeno
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