FGFS-4.1/simgear
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prevent division by zero

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This commit is contained in:
ehofman
2009-08-21 07:43:01 +00:00
committed by Tim Moore
parent 1f3838b155
commit d3572c2562
1 changed files with 4 additions and 5 deletions
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9
simgear/scene/sky/oursun.cxx
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@@ -231,12 +231,11 @@ SGSun::build( SGPath path, double sun_size, SGPropertyNode *property_tree_Node )
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
bool SGSun::repaint( double sun_angle, double new_visibility ) {
if ( visibility != new_visibility ) {
visibility = new_visibility;
if ( visibility != new_visibility ) {
if (new_visibility < 100.0) new_visibility = 100.0;
else if (new_visibility > 45000.0) new_visibility = 45000.0;
visibility = new_visibility;
sun_exp2_punch_through = 2.0/log(visibility);
}
@@ -249,7 +248,7 @@ bool SGSun::repaint( double sun_angle, double new_visibility ) {
aerosol_factor = 8000;
}
else {
aerosol_factor = 80.5 / log( visibility / 100 );
aerosol_factor = 80.5 / log( visibility / 99.9 );
}
// get environmental data from property tree or use defaults
@@ -333,7 +332,7 @@ bool SGSun::repaint( double sun_angle, double new_visibility ) {
o_halo_color[1] = 0.2 * sun_color[1] + 0.8 * scene_color[1];
o_halo_color[2] = 0.2 * sun_color[2] + 0.8 * scene_color[2];
o_halo_color[3] = blue_scat_f;
if ((new_visibility < 10000) && (blue_scat_f > 1)) {
if ((visibility < 10000) && (blue_scat_f > 1)) {
o_halo_color[3] = 2 - blue_scat_f;
}
if (o_halo_color[3] > 1) o_halo_color[3] = 1;