From 61dc8df110a598fbd3f784e95d6431a8a4836fd1 Mon Sep 17 00:00:00 2001
From: frohlich <frohlich>
Date: Mon, 26 May 2008 20:34:26 +0000
Subject: [PATCH] Implement rotation offsets for cameras.

---
 src/Main/fg_os_osgviewer.cxx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Main/fg_os_osgviewer.cxx b/src/Main/fg_os_osgviewer.cxx
index bb09ab9e9..5f3ecbdba 100644
--- a/src/Main/fg_os_osgviewer.cxx
+++ b/src/Main/fg_os_osgviewer.cxx
@@ -208,6 +208,7 @@ void fgOSOpenWindow(bool stencil)
             cameraTraits = new osg::GraphicsContext::Traits(*traits);
             double shearx = cameraNode->getDoubleValue("shear-x", 0);
             double sheary = cameraNode->getDoubleValue("shear-y", 0);
+            double heading = cameraNode->getDoubleValue("heading-deg", 0);
             setTraitsFromProperties(cameraTraits.get(), cameraNode, wsi);
             // FIXME, currently this is too much of a problem to route
             // the resize events. When we do no longer need sdl and
@@ -236,8 +237,11 @@ void fgOSOpenWindow(bool stencil)
                                                         cameraNameString);
                 if (shearx == 0 && sheary == 0)
                     cam3D->flags |= Camera3D::MASTER;
-                viewer->addSlave(camera, Matrix::translate(-shearx, -sheary, 0),
-                                 Matrix());
+                
+                osg::Matrix pOff = osg::Matrix::translate(-shearx, -sheary, 0);
+                osg::Matrix vOff;
+                vOff.makeRotate(SGMiscd::deg2rad(heading), osg::Vec3(0, 1, 0));
+                viewer->addSlave(camera, pOff, vOff);
             } else {
                 SG_LOG(SG_GENERAL, SG_WARN,
                        "Couldn't create graphics context on "