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brighten te sky color towards the sun at dusk and dawn

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ehofman 2009-04-27 20:26:28 +00:00 committed by Tim Moore
parent 19c463f810
commit bdccfb587d
1 changed files with 7 additions and 8 deletions
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15
src/Time/light.cxx
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@ -191,8 +191,8 @@ void FGLight::update_sky_color () {
// calculate lighting parameters based on sun's relative angle to
// local up
float av = thesky->get_visibility();
if (av > 45000.0) av = 45000.0;
static SGConstPropertyNode_ptr humidity = fgGetNode("/environment/relative-humidity");
float av = humidity->getFloatValue() * 45;
float visibility_log = log(av)/11.0;
float visibility_inv = (45000.0 - av)/45000.0;
@ -316,17 +316,16 @@ void FGLight::update_adj_fog_color () {
// Calculate the fog color in the direction of the sun for
// sunrise/sunset effects.
//
float s_red = (_fog_color[0] + 2 * sun_color[0]*sun_color[0]) / 3;
float s_green = (_fog_color[1] + 2 * sun_color[1]*sun_color[1]) / 3;
float s_blue = (_fog_color[2] + 2 * sun_color[2]) / 3;
float s_red = sun_color[0]*sun_color[0];
float s_green = sun_color[1]*sun_color[1];
float s_blue = sun_color[2];
// interpolate beween the sunrise/sunset color and the color
// at the opposite direction of this effect. Take in account
// the current visibility.
//
float av = thesky->get_visibility();
if (av > 45000)
av = 45000;
if (av > 45000) av = 45000;
float avf = 0.87 - (45000 - av) / 83333.33;
float sif = 0.5 - cos(_sun_angle*2)/2;
@ -335,7 +334,7 @@ void FGLight::update_adj_fog_color () {
sif = 1e-4;
float rf1 = fabs((hor_rotation - SGD_PI) / SGD_PI); // 0.0 .. 1.0
float rf2 = avf * pow(rf1 * rf1, 1/sif) * 1.0639;
float rf2 = avf * pow(rf1*rf1, 1/sif) * 1.0639;
float rf3 = 1.0 - rf2;
_adj_fog_color[0] = rf3 * _fog_color[0] + rf2 * s_red;