vec3.js

class vec3 {
    set(x=0, y=0, z=0) {
        this.x = x;
        this.y = y;
        this.z = z;
        return this;
    }
    copy(v) {
        return this.set(v.x, v.y, v.z)
    }
    constructor(x, y, z) {
        this.set(x, y, z);
    }
    dot(v) {
        return (v.x * this.x) + (v.y * this.y) + (v.z * this.z)
    }
    len2() {
        return this.x * this.x + this.y * this.y + this.z * this.z
    }
    len() {
        return Math.sqrt(this.len2())
    }
    add(v) {
        this.x += v.x;
        this.y += v.y;
        this.z += v.z;
        return this
    }
    sub(v) {
        this.x -= v.x;
        this.y -= v.y;
        this.z -= v.z;
        return this
    }
    scale(v) {
        this.x *= v;
        this.y *= v;
        this.z *= v;
        return this;
    }
    cross(v) {
        return this.set(this.y * v.z - this.z * v.y, this.z * v.y - this.x * v.z, this.x * v.y - this.y * v.x)
    }
    nml() {
        return this.scale(1 / this.len())
    }
}