Forgot to remove a micro optimization.

src/liberty/collision/Collision.cpp

@@ -787,12 +787,14 @@ bool
 CCollision::ProcessSphereSphere(const CColSphere &s1, const CColSphere &s2, CColPoint &point, float &mindistsq)
 {
 	CVector dist = s1.center - s2.center;
+	float d = dist.Magnitude() - s2.radius;	// distance from s1's center to s2
 	float mag = dist.Magnitude();
 	float d = mag - s2.radius;	// distance from s1's center to s2
 	float depth = s1.radius - d;	// sphere overlap
 	if(d < 0.0f) d = 0.0f;		// clamp to zero, i.e. if s1's center is inside s2
 	// no collision if sphere is not close enough
 	if(d*d < mindistsq && d < s1.radius){
+		dist.Normalise();
 		dist *= Invert<true, false>(mag);
 		point.point = s1.center - dist*d;
 		point.normal = dist;