>from Ron Parker...
>
>I haven't tested this, and I'm not sure it's quite right.  In particular,
>the terms inside the atan2 might be different than I have here.  For
example,
>where I have DY, you might really need -DY.  If it doesn't work, try
>different combinations of signs.  I'm also assuming that the axis of your
>texture lies along the +Y axis.
>
>

OK, I'll try that tomorrow (today, by local time). I have an exam in eight
hours, so I won't bother you again for at least 24 hours :) Anyway, +Y it
is, and I'll just write a #while to check all combinations at once.

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