"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
>
> Just checking y would be easier. If it is very near 1, both x and y must
> be near 0. It is equal to the sine of the angle to a horizontal plane.

That's the bit I couldn't quite remember (i.e. whether trace could return
<1,1,1> as a vector).

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