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Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.

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curt
1997-12-22 04:14:28 +00:00
parent 4c18fbcafd
commit 982d714749
1 changed files with 28 additions and 3 deletions
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Scenery/sky.c
+28 -3
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@@ -99,7 +99,7 @@ void fgSkyRender() {
struct fgFLIGHT *f;
struct fgLIGHT *l;
struct fgVIEW *v;
float inner_color[4], middle_color[4], diff;
float inner_color[4], middle_color[4], diff, east_dot, dot, angle;
int i;
f = &current_aircraft.flight;
@@ -125,6 +125,25 @@ void fgSkyRender() {
xglPushMatrix();
/* calculate the angle between v->surface_to_sun and
* v->surface_east. We do this so we can sort out the acos()
* ambiguity. I wish I could think of a more efficient way ... :-( */
east_dot = MAT3_DOT_PRODUCT(v->surface_to_sun, v->surface_east);
printf(" East dot product = %.2f\n", east_dot);
/* calculate the angle between v->surface_to_sun and
* v->surface_south. this is how much we have to rotate the sky
* for it to align with the sun */
dot = MAT3_DOT_PRODUCT(v->surface_to_sun, v->surface_south);
printf(" Dot product = %.2f\n", dot);
if ( east_dot >= 0 ) {
angle = acos(dot);
} else {
angle = -acos(dot);
}
printf(" Sky needs to rotate = %.3f rads = %.1f degrees.\n",
angle, angle * RAD_TO_DEG);
/* Translate to view position */
xglTranslatef( v->cur_zero_elev.x, v->cur_zero_elev.y, v->cur_zero_elev.z );
/* printf(" Translated to %.2f %.2f %.2f\n",
@@ -135,6 +154,7 @@ void fgSkyRender() {
FG_Latitude * RAD_TO_DEG);
xglRotatef( FG_Longitude * RAD_TO_DEG, 0.0, 0.0, 1.0 );
xglRotatef( 90.0 - FG_Latitude * RAD_TO_DEG, 0.0, 1.0, 0.0 );
xglRotatef( angle * RAD_TO_DEG, 0.0, 0.0, 1.0 );
/* Draw inner/center section of sky*/
xglBegin( GL_TRIANGLE_FAN );
@@ -156,8 +176,10 @@ void fgSkyRender() {
xglVertex3fv( sky_inner[i] );
}
xglColor4fv( middle_color );
xglColor4f(1.0, 0.0, 0.0, 1.0);
xglVertex3fv( sky_middle[0] );
xglColor4fv( inner_color );
xglColor4f(1.0, 0.0, 0.0, 1.0);
xglVertex3fv( sky_inner[0] );
xglEnd();
@@ -180,9 +202,12 @@ void fgSkyRender() {
/* $Log$
/* Revision 1.5 1997/12/19 23:34:59 curt
/* Lot's of tweaking with sky rendering and lighting.
/* Revision 1.6 1997/12/22 04:14:34 curt
/* Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
/*
* Revision 1.5 1997/12/19 23:34:59 curt
* Lot's of tweaking with sky rendering and lighting.
*
* Revision 1.4 1997/12/19 16:45:02 curt
* Working on scene rendering order and options.
*