Save a costly SGVec3d::fromGeod() calculation

diff --git a/simgear/scene/sky/sky.cxx b/simgear/scene/sky/sky.cxx
index 2eec5cc3bbd65b184e277d0e29560d1f867cccd0..21662c66b5cdc574dd27ee56a5c1a36f58cd5504 100644 (file)
--- a/simgear/scene/sky/sky.cxx
+++ b/simgear/scene/sky/sky.cxx
@@ -147,22 +147,20 @@ bool SGSky::reposition( const SGSkyState &st, const SGEphemeris& eph, double dt
     double angle = st.gst * 15;        // degrees
     double angleRad = SGMiscd::deg2rad(angle);
 
-    SGVec3f view_pos, zero_elev, view_up;
+    SGVec3f zero_elev, view_up;
     double lon, lat, alt;
 
-    view_pos = toVec3f( SGVec3d::fromGeod(st.pos) );
-    SGGeod geodZeroViewPos = SGGeod::fromGeodM(st.pos, 0);
+    SGGeod geodZeroViewPos = SGGeod::fromGeodM(st.pos_geod, 0);
     zero_elev = toVec3f( SGVec3d::fromGeod(geodZeroViewPos) );
-
     view_up = toVec3f( st.ori.backTransform(SGVec3d::e2()) );
-    lon = st.pos.getLongitudeRad();
-    lat = st.pos.getLatitudeRad();
-    alt = st.pos.getElevationM();
+    lon = st.pos_geod.getLongitudeRad();
+    lat = st.pos_geod.getLatitudeRad();
+    alt = st.pos_geod.getElevationM();
 
     dome->reposition( zero_elev, alt, lon, lat, st.spin );
 
     osg::Matrix m = osg::Matrix::rotate(angleRad, osg::Vec3(0, 0, -1));
-    m.postMultTranslate(toOsg(view_pos));
+    m.postMultTranslate(toOsg(st.pos));
     _ephTransform->setMatrix(m);
 
     double sun_ra = eph.getSunRightAscension();

diff --git a/simgear/scene/sky/sky.hxx b/simgear/scene/sky/sky.hxx
index 1f1190f87286126d044edbbe7122244f2b6f9de0..28678041ac820ea441acd39c7b64a6f63d738f84 100644 (file)
--- a/simgear/scene/sky/sky.hxx
+++ b/simgear/scene/sky/sky.hxx
@@ -57,7 +57,8 @@ using std::vector;
 
 
 typedef struct {
-        SGGeod pos;
+        SGVec3d pos;
+        SGGeod pos_geod;
         SGQuatd ori;
         double spin;
        double gst;