mmd-mpl 0.2.16

MPL is a rule-based Domain-Specific Language for creating MMD poses and animations using natural semantic syntax
Documentation 
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use serde::{Deserialize, Serialize};
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct Quaternion {
    pub x: f32,
    pub y: f32,
    pub z: f32,
    pub w: f32,
}

#[wasm_bindgen]
impl Quaternion {
    #[wasm_bindgen(constructor)]
    pub fn new(x: f32, y: f32, z: f32, w: f32) -> Self {
        Self { x, y, z, w }
    }
    pub fn identity() -> Self {
        Self {
            x: 0.0,
            y: 0.0,
            z: 0.0,
            w: 1.0,
        }
    }
    pub fn multiply(&self, other: &Self) -> Self {
        Self {
            x: self.w * other.x + self.x * other.w + self.y * other.z - self.z * other.y,
            y: self.w * other.y - self.x * other.z + self.y * other.w + self.z * other.x,
            z: self.w * other.z + self.x * other.y - self.y * other.x + self.z * other.w,
            w: self.w * other.w - self.x * other.x - self.y * other.y - self.z * other.z,
        }
    }

    pub fn dot(&self, other: &Self) -> f32 {
        self.x * other.x + self.y * other.y + self.z * other.z + self.w * other.w
    }

    pub fn similarity(&self, other: &Self) -> f32 {
        self.dot(other).abs()
    }

    pub fn angular_distance(&self, other: &Self) -> f32 {
        1.0 - self.similarity(other)
    }

    pub fn from_axis_angle(axis: Vector3, degrees: f32) -> Self {
        if degrees.abs() < 0.0001 {
            return Self::identity();
        }
        let radians = degrees * (std::f32::consts::PI / 180.0);
        let half = radians / 2.0;
        let sin = half.sin();
        let cos = half.cos();
        let n = axis.normalize();
        Self::new(n.x * sin, n.y * sin, n.z * sin, cos)
    }
}

#[wasm_bindgen]
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct Vector3 {
    pub x: f32,
    pub y: f32,
    pub z: f32,
}

#[wasm_bindgen]
impl Vector3 {
    #[wasm_bindgen(constructor)]
    pub fn new(x: f32, y: f32, z: f32) -> Self {
        Self { x, y, z }
    }
    pub fn normalize(&self) -> Self {
        let magnitude = (self.x * self.x + self.y * self.y + self.z * self.z).sqrt();
        Self {
            x: self.x / magnitude,
            y: self.y / magnitude,
            z: self.z / magnitude,
        }
    }

    /// Dot product with another vector
    pub fn dot(&self, other: &Self) -> f32 {
        self.x * other.x + self.y * other.y + self.z * other.z
    }

    pub fn add(&self, other: &Self) -> Self {
        Self {
            x: self.x + other.x,
            y: self.y + other.y,
            z: self.z + other.z,
        }
    }
    pub fn multiply_by_scalar(&self, scalar: f32) -> Self {
        Self {
            x: self.x * scalar,
            y: self.y * scalar,
            z: self.z * scalar,
        }
    }
}