Function degrees_between 

pub fn degrees_between(one: ThreeVec, other: ThreeVec) -> f64

Return the angle between two vectors in degrees

Example

use std::f64;
use calcify::ThreeVec;
use calcify::degrees_between;

let vec1 = ThreeVec::new(1.0,0.0,0.0);
let vec2 = ThreeVec::new(0.0,1.0,0.0);

assert_eq!(degrees_between(vec1,vec2),90.0);