From bfad5ebde451bb0cab4bcb137621d3cf61197024 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Fri, 8 Dec 2017 17:42:20 +0100
Subject: [PATCH] CS: Fix camera orbit control with keys

---
 apps/opencs/view/render/cameracontroller.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/apps/opencs/view/render/cameracontroller.cpp b/apps/opencs/view/render/cameracontroller.cpp
index f0158fe28..abf68ef93 100644
--- a/apps/opencs/view/render/cameracontroller.cpp
+++ b/apps/opencs/view/render/cameracontroller.cpp
@@ -690,7 +690,9 @@ namespace CSVRender
         osg::Vec3 absoluteUp = osg::Vec3(0,0,1);
 
         osg::Vec3d forward = center - eye;
-        osg::Quat rotation = osg::Quat(value, absoluteUp ^ forward);
+
+        osg::Vec3d axis = absoluteUp ^ forward * (up.z() < 0.0 ? -1.0 : 1.0);
+        osg::Quat rotation = osg::Quat(value,axis);
         osg::Vec3d oldOffset = eye - mCenter;
         osg::Vec3d newOffset = rotation * oldOffset;