From be3d2be9d3244b35ab6b76fe1cf9ac7033f5758c Mon Sep 17 00:00:00 2001
From: Oleg Kalachev <okalachev@gmail.com>
Date: Tue, 21 May 2024 10:50:47 +0300
Subject: [PATCH] Fix Vector::angularRatesBetweenVectors return NaNs on
 opposite vectors

---
 flix/vector.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/flix/vector.h b/flix/vector.h
index c1433e1..b096a5e 100644
--- a/flix/vector.h
+++ b/flix/vector.h
@@ -80,6 +80,10 @@ public:
 
 	static Vector angularRatesBetweenVectors(const Vector& a, const Vector& b) {
 		Vector direction = cross(a, b);
+		if (direction.zero()) {
+			// vectors are opposite, return any perpendicular vector
+			return cross(a, Vector(1, 0, 0));
+		}
 		direction.normalize();
 		float angle = angleBetweenVectors(a, b);
 		return direction * angle;