tessera 0.1.0

A library and command line interface for calculating geometric error for 3D Tiles tilesets
Documentation 
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use std::ops::{Add, Mul, Sub};

#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Vec3 {
    pub x: f64,
    pub y: f64,
    pub z: f64,
}

impl Vec3 {
    pub fn new(x: f64, y: f64, z: f64) -> Self {
        Self { x, y, z }
    }

    pub fn from_array(array: &[f32; 3]) -> Self {
        Self {
            x: array[0] as f64,
            y: array[1] as f64,
            z: array[2] as f64,
        }
    }

    pub fn to_array(&self) -> [f32; 3] {
        return [self.x as f32, self.y as f32, self.z as f32];
    }

    pub fn dot(&self, other: &Self) -> f64 {
        return self.x * other.x + self.y * other.y + self.z * other.z;
    }

    pub fn cross(&self, other: &Self) -> Self {
        return Self {
            x: self.y * other.z - self.z * other.y,
            y: self.z * other.x - self.x * other.z,
            z: self.x * other.y - self.y * other.x,
        };
    }

    pub fn normalize(&self) -> Self {
        return *self * (1.0 / self.length());
    }

    pub fn length_squared(&self) -> f64 {
        return self.dot(self);
    }

    pub fn length(&self) -> f64 {
        return self.length_squared().sqrt();
    }
}

impl Add for Vec3 {
    type Output = Self;

    fn add(self, other: Self) -> Self::Output {
        Self {
            x: self.x + other.x,
            y: self.y + other.y,
            z: self.z + other.z,
        }
    }
}

impl Sub for Vec3 {
    type Output = Self;

    fn sub(self, other: Self) -> Self::Output {
        Self {
            x: self.x - other.x,
            y: self.y - other.y,
            z: self.z - other.z,
        }
    }
}

impl Mul<Vec3> for f64 {
    type Output = Vec3;

    fn mul(self, other: Vec3) -> Self::Output {
        return other * self;
    }
}

impl Mul<f64> for Vec3 {
    type Output = Self;

    fn mul(self, scalar: f64) -> Self::Output {
        Self {
            x: self.x * scalar,
            y: self.y * scalar,
            z: self.z * scalar,
        }
    }
}

pub struct Vec4 {
    pub x: f64,
    pub y: f64,
    pub z: f64,
    pub w: f64,
}

impl Vec4 {
    pub fn new(x: f64, y: f64, z: f64, w: f64) -> Self {
        Self { x, y, z, w }
    }
}

mod tests {
    use super::*;

    // TODO: expand vec3 tests for safety

    #[test]
    fn test_vec3_cross_with_different_vectors() {
        let a = Vec3::new(1.0, 2.0, 3.0);
        let b = Vec3::new(4.0, 5.0, 6.0);
        let c = a.cross(&b);
        assert_eq!(c, Vec3::new(-3.0, 6.0, -3.0));
    }

    #[test]
    fn test_vec3_cross_with_colinear_vectors() {
        let a = Vec3::new(1.0, 2.0, 3.0);
        let b = Vec3::new(2.0, 4.0, 6.0);
        let c = a.cross(&b);
        assert_eq!(c, Vec3::new(0.0, 0.0, 0.0));
    }
}