FGFS-4.1/simgear
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Rendering tweaks.

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This commit is contained in:
curt 2000-03-17 05:16:15 +00:00
parent 48689622b4
commit 68a19bd39f
2 changed files with 7 additions and 6 deletions
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2
simgear/ephemeris/stars.hxx
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@ -30,7 +30,7 @@
#include <simgear/misc/fgpath.hxx>
#define FG_MAX_STARS 3500
#define FG_MAX_STARS 850
class FGStars {

11
simgear/sky/stars.cxx
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@ -140,13 +140,13 @@ bool SGStars::repaint( double sun_angle, int num, sgdVec3 *star_data ) {
if ( sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
// deep night
factor = 1.0;
cutoff = 4.2;
cutoff = 4.5;
} else if ( sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
factor = 1.0;
cutoff = 3.6;
cutoff = 3.8;
} else if ( sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
factor = 0.95;
cutoff = 3.0;
cutoff = 3.1;
} else if ( sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
factor = 0.9;
cutoff = 2.4;
@ -178,8 +178,9 @@ bool SGStars::repaint( double sun_angle, int num, sgdVec3 *star_data ) {
// color (magnitude)
mag = star_data[i][2];
if ( mag < cutoff ) {
nmag = ( 4 - mag ) / 5.0; // translate to 0 ... 1.0 scale
alpha = nmag * 0.7 + 0.3; // translate to a 0.3 ... 1.0 scale
nmag = ( 4.5 - mag ) / 5.5; // translate to 0 ... 1.0 scale
// alpha = nmag * 0.7 + 0.3; // translate to a 0.3 ... 1.0 scale
alpha = nmag * 0.85 + 0.15; // translate to a 0.15 ... 1.0 scale
alpha *= factor; // dim when the sun is brighter
} else {
alpha = 0.0;