Function dot_3d 

pub fn dot_3d(a: &[f64; 3], b: &[f64; 3], c: &[f64; 3]) -> i16

Computes the sign of the dot product between two vectors.

Parameters

• a, b, c, three 3d points

Returns

• the sign of the dot product between the vectors ab and ac

Example

use geogram_predicates as gp;
 
/// // Define four points that form a matrix
let a = [0.0, 0.0, 0.0];
let b = [1.0, 0.0, 0.0];
let c = [0.0, 1.0, 0.0];

let dot_sign = gp::dot_3d(&a, &b, &c); // should be orthogonal
assert_eq!(dot_sign, 0);