gets a plane's normal from 3 points
npm install get-plane-normal
Gets a plane's normal from 3 points on that plane.
``js
var point1 = [0, 1, 0],
point2 = [1, 1, 0.5],
point3 = [0, 1, -2]
var norm = normal([], point1, point2, point3)
console.log(norm) // [0, 1, 0]
`
#### out = normal(out, point1, point2, point3)
With three points on the same plane, determines the unit normal and stores it in out [x, y, z].
Returns out`.
MIT, see LICENSE.md for details.