From cfedc90fdd420a0ec25ca0a2ba3f07fc242c5642 Mon Sep 17 00:00:00 2001
From: ehofman <ehofman>
Date: Thu, 15 Jan 2004 14:23:06 +0000
Subject: [PATCH] Try to prevent a devide by zero situation

---
 simgear/scene/sky/sky.cxx | 17 +++++++----------
 simgear/scene/sky/sky.hxx |  2 +-
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/simgear/scene/sky/sky.cxx b/simgear/scene/sky/sky.cxx
index 059bdf46..fe6bb0ed 100644
--- a/simgear/scene/sky/sky.cxx
+++ b/simgear/scene/sky/sky.cxx
@@ -112,14 +112,12 @@ bool SGSky::repaint( const SGSkyColor &sc )
 	dome->repaint( sc.sky_color, sc.fog_color, sc.sun_angle,
                        effective_visibility );
 
-	oursun->repaint( sc.sun_angle, effective_visibility );
+        stars->repaint( sc.sun_angle, sc.nstars, sc.star_data );
+        planets->repaint( sc.sun_angle, sc.nplanets, sc.planet_data );
 
+	oursun->repaint( sc.sun_angle, effective_visibility );
 	moon->repaint( sc.moon_angle );
 
-	planets->repaint( sc.sun_angle, sc.nplanets, sc.planet_data );
-
-	stars->repaint( sc.sun_angle, sc.nstars, sc.star_data );
-
 	for ( int i = 0; i < (int)cloud_layers.size(); ++i ) {
             if (cloud_layers[i]->getCoverage() != SGCloudLayer::SG_CLOUD_CLEAR){
                 cloud_layers[i]->repaint( sc.cloud_color );
@@ -148,16 +146,15 @@ bool SGSky::reposition( SGSkyState &st, double dt )
 
     dome->reposition( st.zero_elev, st.lon, st.lat, st.spin );
 
+    stars->reposition( st.view_pos, angle );
+    planets->reposition( st.view_pos, angle );
+
     oursun->reposition( st.view_pos, angle,
                         st.sun_ra, st.sun_dec, st.sun_dist );
 
     moon->reposition( st.view_pos, angle,
                       st.moon_ra, st.moon_dec, st.moon_dist );
 
-    planets->reposition( st.view_pos, angle );
-
-    stars->reposition( st.view_pos, angle );
-
     for ( int i = 0; i < (int)cloud_layers.size(); ++i ) {
         if ( cloud_layers[i]->getCoverage() != SGCloudLayer::SG_CLOUD_CLEAR ) {
             cloud_layers[i]->reposition( st.zero_elev, st.view_up,
@@ -176,7 +173,7 @@ void SGSky::preDraw( float alt, float fog_exp2_density ) {
 
     // FIXME: This should not be needed, but at this time (08/15/2003)
     //        certain NVidia drivers don't seem to implement
-    //        fgPushAttrib(FG_FOG_BIT) properly. The result is that
+    //        glPushAttrib(FG_FOG_BIT) properly. The result is that
     //        there is not fog when looking at the sun.
     glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 
diff --git a/simgear/scene/sky/sky.hxx b/simgear/scene/sky/sky.hxx
index 67e3b483..099357bd 100644
--- a/simgear/scene/sky/sky.hxx
+++ b/simgear/scene/sky/sky.hxx
@@ -416,7 +416,7 @@ public:
      * @param v visibility in meters
      */
     inline void set_visibility( float v ) {
-	effective_visibility = visibility = v;
+	effective_visibility = visibility = (v <= 25.0) ? 25.0 : v;
     }
 };
 
-- 
2.39.5