ovis: also free yaw axis of camera manager and default to free yaw

so meshes in any orientation can be properly viewed

Author: paroj

modules/ovis/src/ovis.cpp

@@ -319,7 +319,11 @@ class WindowSceneImpl : public WindowScene
         {
             camman.reset(new OgreBites::CameraMan(camNode));
             camman->setStyle(OgreBites::CS_ORBIT);
-            camNode->setFixedYawAxis(true, Vector3::NEGATIVE_UNIT_Y);
+#if OGRE_VERSION >= ((1 << 16) | (11 << 8) | 5)
+            camman->setFixedYaw(false);
+#else
+            camNode->setFixedYawAxis(true, Vector3::NEGATIVE_UNIT_Y); // OpenCV +Y in Ogre CS
+#endif
         }
 
         if (!app->sceneMgr)
@@ -694,6 +698,10 @@ class WindowSceneImpl : public WindowScene
 
     void fixCameraYawAxis(bool useFixed, InputArray _up) CV_OVERRIDE
     {
+#if OGRE_VERSION >= ((1 << 16) | (11 << 8) | 5)
+        if(camman) camman->setFixedYaw(useFixed);
+#endif
+
         Vector3 up = Vector3::NEGATIVE_UNIT_Y;
         if (!_up.empty())
         {