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Take the visibility in account for the sky color

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ehofman 2003-06-15 11:30:25 +00:00
parent 0c5115e69a
commit 3433dbce55
1 changed files with 11 additions and 3 deletions
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14
src/Time/light.cxx
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@ -56,6 +56,7 @@ SG_USING_STD(string);
#include <simgear/screen/colors.hxx>
#include <Main/globals.hxx>
#include <Main/fg_props.hxx>
#include <Main/viewer.hxx>
#include "light.hxx"
@ -229,12 +230,19 @@ void fgLIGHT::UpdateAdjFog( void ) {
float s_blue = (fog_color[2] + 2 * sun_color[2]) / 3;
// interpolate beween the sunrise/sunset color and the color
// at the opposite direction of this effect.
// at the opposite direction of this effect. Take in account
// the current visibility.
//
float av = thesky->get_visibility();
if (av > 45000)
av = 45000;
float avf = 0.87 - (45000 - av) / 83333.33;
float sif = 0.5 - cos(sun_angle*2)/2;
float rf1 = fabs((rotation - SGD_PI) / SGD_PI); // 0.0 .. 1.0
float rf2 = 0.87 * pow(rf1 * rf1, 1/sif);
float rf3 = 1.0 - rf2;
float rf2 = avf * pow(rf1 * rf1, 1/sif);
float rf3 = 0.94 - rf2;
adj_fog_color[0] = rf3 * fog_color[0] + rf2 * s_red;
adj_fog_color[1] = rf3 * fog_color[1] + rf2 * s_green;