From e354203c2110f70d2b7a831df959aa8b0f9387e1 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Thu, 15 Mar 2012 19:49:15 +0100
Subject: [PATCH] stars rotation

---
 apps/openmw/mwrender/sky.cpp | 9 ++++++++-
 apps/openmw/mwrender/sky.hpp | 4 +++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/apps/openmw/mwrender/sky.cpp b/apps/openmw/mwrender/sky.cpp
index 65d730df94..0b30cd45a4 100644
--- a/apps/openmw/mwrender/sky.cpp
+++ b/apps/openmw/mwrender/sky.cpp
@@ -59,7 +59,8 @@ void BillboardObject::setPosition(const Vector3& pPosition)
 
 Vector3 BillboardObject::getPosition() const
 {
-    return mNode->getPosition();
+    Vector3 p = mNode->_getDerivedPosition() - mNode->getParentSceneNode()->_getDerivedPosition();
+    return Vector3(p.x, -p.z, p.y);
 }
 
 void BillboardObject::setColour(const ColourValue& pColour)
@@ -582,6 +583,9 @@ void SkyManager::update(float duration)
     mSun->setVisible(mSunEnabled);
     mMasser->setVisible(mMasserEnabled);
     mSecunda->setVisible(mSecundaEnabled);
+
+    // rotate the whole sky by 360 degrees every 4 days
+    mRootNode->roll(Degree(mHourDiff*360/96.f));
 }
 
 void SkyManager::enable()
@@ -759,6 +763,9 @@ void SkyManager::setSecundaFade(const float fade)
 
 void SkyManager::setHour(double hour)
 {
+    mHourDiff = mHour - hour;
+    if (mHourDiff > 0) mHourDiff -= 24;
+
     mHour = hour;
 }
 
diff --git a/apps/openmw/mwrender/sky.hpp b/apps/openmw/mwrender/sky.hpp
index c3ff00b509..22aaa96e79 100644
--- a/apps/openmw/mwrender/sky.hpp
+++ b/apps/openmw/mwrender/sky.hpp
@@ -166,7 +166,9 @@ namespace MWRender
         float mHour;
         int mDay;
         int mMonth;
-    
+
+        float mHourDiff;
+
         BillboardObject* mSun;
         BillboardObject* mSunGlare;
         Moon* mMasser;