Method unit

Geometry/Geometry 3D.cpp:68–68

    double abs() { return sqrt(x * x + y * y + z * z); }
    double sq() { return x * x + y * y + z * z; }
    p3 unit() { return *this / abs(); }
}zero(0, 0, 0);
double operator | (p3 v, p3 w) { //dot product
    return v.x * w.x + v.y * w.y + v.z * w.z;