Whats the difference between Vector2(1,1).bounce(n) and Vector2(1,1).reflect(n) ?

Question

The both appear to do the same thing and if you call bounce without normalizing the input it will even say the reflect function has failed. Is it just their to make it more obvious to users that such a function exists? And if not whats the difference, neither are deprecated.

Answer 1

Hi,
this is the cpp function from godot 4 .. which would be the same as in 3

Vector2 Vector2::bounce(const Vector2 &p_normal) const {
    return -reflect(p_normal);
}

Vector2 Vector2::reflect(const Vector2 &p_normal) const {
#ifdef MATH_CHECKS
    ERR_FAIL_COND_V_MSG(!p_normal.is_normalized(), Vector2(), "The normal Vector2 must be normalized.");
#endif
    return 2.0 * p_normal * this->dot(p_normal) - *this;
}

so ... bounce is just reflect inverted