xor (x, y)

"Hey, this looks like a cool pattern to _quickly_ implement..."

Famous last words.

Is bitwise_xor () a valid numeric expression for POV-Ray functions?   Nope.

So I had to make a function to grab the kth bit of the binary representation of
decimal integer N.
Then an xor function.
Then a function that reassembles the xor'd bits into a decimal value.
Then puzzle out how to properly visualize that in a pigment {function {}}
statement, given all the things peculiar to POV-Ray.

All in all quite a bit longer than I expected it to take.

Perhaps consider adding (probably under-the-hood) dec2bin conversion functions.

Also binary functions, taking decimal arguments.
You may just want to have generic binary functions that take 2 arguments - the
number as an argument, plus the base the argument is in (maybe hex).
Or maybe there's a whole other system of doing all that, which makes more sense.

 - BW

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