Function cross

native/shared/src/picking.rs:257–263

(a: &[f32; 3], b: &[f32; 3])

}

fn cross(a: &[f32; 3], b: &[f32; 3]) -> [f32; 3] {
    [
        a[1]*b[2] - a[2]*b[1],
        a[2]*b[0] - a[0]*b[2],
        a[0]*b[1] - a[1]*b[0],
    ]
}

fn dot(a: &[f32; 3], b: &[f32; 3]) -> f32 {
    a[0]*b[0] + a[1]*b[1] + a[2]*b[2]