FGFS-4.1/simgear
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Try to prevent a devide by zero situation

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This commit is contained in:
ehofman 2004-01-15 14:23:06 +00:00
parent 5665a62938
commit cfedc90fdd
2 changed files with 8 additions and 11 deletions
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17
simgear/scene/sky/sky.cxx
View File

@ -112,14 +112,12 @@ bool SGSky::repaint( const SGSkyColor &sc )
dome->repaint( sc.sky_color, sc.fog_color, 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 );

2
simgear/scene/sky/sky.hxx
View File

@ -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;
}
};