Andrew, such angles only make sense in 2D. You need a plane definition before you can treat something as clockwise or counter-clockwise.
-- David Rutten Robert McNeel & Associates On Nov 27, 9:17 pm, Andrew <[EMAIL PROTECTED]> wrote: > Hey all - > > I'm trying to calculate the angle between a vector A and the X vector. > The current vector angle component gives either the angle from 0-Pi or > the reflex angle (from Pi-2Pi), but either way, two angles that are > mirror images of one another across the X-axis return the same result. > I need them to return different values; either negative if below the X > axis (Blue) or 2Pi-angle (Green) if below. I came up with a sort of > messy work around that takes the Y component of angle A, and gives me > a boolean value of true if negative, which I can then use to make the > angle value negative.http://grasshopper3d.googlegroups.com/web/diagram.gif > > Any ideas on a better way to do this? > > Thanks, > > Andrew
