From fde75b49095458f8c405fef8c5550675f7e65761 Mon Sep 17 00:00:00 2001
From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Thu, 4 Sep 2008 09:28:23 +0000
Subject: [PATCH] fix the mathlib corner case vectoangles2('0 0 -1', '...')

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@8491 d7cf8633-e32d-0410-b094-e92efae38249
---
 mathlib.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/mathlib.c b/mathlib.c
index cbd57db1..d6170d28 100644
--- a/mathlib.c
+++ b/mathlib.c
@@ -523,8 +523,16 @@ void AnglesFromVectors (vec3_t angles, const vec3_t forward, const vec3_t up, qb
 {
 	if (forward[0] == 0 && forward[1] == 0)
 	{
-		angles[PITCH] = forward[2] > 0 ? -M_PI * 0.5 : M_PI * 0.5;
-		angles[YAW] = up ? atan2(-up[1], -up[0]) : 0;
+		if(forward[2] > 0)
+		{
+			angles[PITCH] = -M_PI * 0.5;
+			angles[YAW] = up ? atan2(-up[1], -up[0]) : 0;
+		}
+		else
+		{
+			angles[PITCH] = M_PI * 0.5;
+			angles[YAW] = up ? atan2(up[1], up[0]) : 0;
+		}
 		angles[ROLL] = 0;
 	}
 	else
-- 
2.39.2