-/**************************************************************************
+/* -*- Mode: C++ -*-
+ *
* fg_init.c -- Flight Gear top level initialization routines
*
* Written by Curtis Olson, started August 1997.
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
+ *
* $Id$
* (Log is kept at end of this file)
**************************************************************************/
#include <stdio.h>
#include <stdlib.h>
-#include "fg_init.h"
-#include "views.h"
-
-#include "../Include/constants.h"
-#include "../Include/general.h"
-
-#include "../Aircraft/aircraft.h"
-#include "../Cockpit/cockpit.h"
-#include "../Joystick/joystick.h"
-#include "../Math/fg_random.h"
-#include "../Scenery/mesh.h"
-#include "../Scenery/astro.h"
-#include "../Scenery/scenery.h"
-#include "../Scenery/sky.h"
-#include "../Time/fg_time.h"
-#include "../Time/sunpos.h"
-#include "../Weather/weather.h"
-
+#include <Main/fg_init.h>
+#include <Main/views.h>
+
+#include <Include/cmdargs.h>
+#include <Include/fg_constants.h>
+#include <Include/general.h>
+
+#include <Aircraft/aircraft.h>
+#include <Astro/moon.h>
+#include <Astro/planets.h>
+#include <Astro/sky.h>
+#include <Astro/stars.h>
+#include <Astro/sun.h>
+#include <Cockpit/cockpit.h>
+#include <Joystick/joystick.h>
+#include <Math/fg_random.h>
+#include <Scenery/scenery.h>
+#include <Scenery/tilemgr.h>
+#include <Time/event.h>
+#include <Time/fg_time.h>
+#include <Time/sunpos.h>
+#include <Weather/weather.h>
+#include <Main/fg_debug.h>
extern int show_hud; /* HUD state */
-
+extern int displayInstruments;
+extern const char *default_root;
/* General house keeping initializations */
-void fgInitGeneral( void ) {
- struct fgGENERAL *g;
+int fgInitGeneral( void ) {
+ fgGENERAL *g;
g = &general;
+ fgInitDebug();
+
+ fgPrintf( FG_GENERAL, FG_INFO, "General Initialization\n" );
+ fgPrintf( FG_GENERAL, FG_INFO, "======= ==============\n" );
+
/* seed the random number generater */
fg_srandom();
- /* determine the fg root path */
- if ( (g->root_dir = getenv("FG_ROOT")) == NULL ) {
- /* environment variable not defined */
- printf("FG_ROOT needs to be defined! See the documentation.\n");
- exit(0);
- }
- printf("FG_ROOT = %s\n", g->root_dir);
+ // determine the fg root path. The command line parser getargs() will
+ // fill in a root directory if the option was used.
+
+ if( !(g->root_dir) ) {
+ // If not set by command line test for environmental var..
+ g->root_dir = getenv("FG_ROOT");
+ if ( !g->root_dir ) {
+ // No root path set? Then assume, we will exit if this is
+ // wrong when looking for support files.
+ g->root_dir = (char *)DefaultRootDir;
+ }
+ }
+ fgPrintf( FG_GENERAL, FG_INFO, "FG_ROOT = %s\n\n", g->root_dir);
+
+ // Dummy value can be changed if future initializations
+ // fail a critical task.
+ return ( 0 /* FALSE */ );
}
-/* This is the top level init routine which calls all the other
- * initialization routines. If you are adding a subsystem to flight
- * gear, its initialization call should located in this routine.*/
+// This is the top level init routine which calls all the other
+// initialization routines. If you are adding a subsystem to flight
+// gear, its initialization call should located in this routine.
+// Returns non-zero if a problem encountered.
-void fgInitSubsystems( void ) {
+int fgInitSubsystems( void ) {
double cur_elev;
- struct fgFLIGHT *f;
+ // Ok will be flagged only if we get EVERYTHING done.
+ int ret_val = 1 /* TRUE */;
+
+ fgFLIGHT *f;
+ struct fgLIGHT *l;
struct fgTIME *t;
struct fgVIEW *v;
- f = ¤t_aircraft.flight;
+ l = &cur_light_params;
t = &cur_time_params;
v = ¤t_view;
+ fgPrintf( FG_GENERAL, FG_INFO, "Initialize Subsystems\n");
+ fgPrintf( FG_GENERAL, FG_INFO, "========== ==========\n");
/****************************************************************
- * The following section sets up the flight model EOM parameters and
+ * The following section sets up the flight model EOM parameters and
* should really be read in from one or more files.
****************************************************************/
- /* Globe Aiport, AZ */
- FG_Runway_longitude = -398391.28;
- FG_Runway_latitude = 120070.41;
- FG_Runway_altitude = 3234.5;
- FG_Runway_heading = 102.0 * DEG_TO_RAD;
+ /* Must happen before any of the flight model or control
+ * parameters are set */
- /* Initial Position at GLOBE airport */
- FG_Longitude = ( -398391.28 / 3600.0 ) * DEG_TO_RAD;
- FG_Latitude = ( 120070.41 / 3600.0 ) * DEG_TO_RAD;
- FG_Altitude = FG_Runway_altitude + 3.758099;
-
- /* Initial Position north of the city of Globe */
- /* FG_Longitude = ( -398673.28 / 3600.0 ) * DEG_TO_RAD; */
- /* FG_Latitude = ( 120625.64 / 3600.0 ) * DEG_TO_RAD; */
- /* FG_Longitude = ( -397867.44 / 3600.0 ) * DEG_TO_RAD; */
- /* FG_Latitude = ( 119548.21 / 3600.0 ) * DEG_TO_RAD; */
- /* FG_Altitude = 0.0 + 3.758099; */
-
- /* Initial Position: 10125 Jewell St. NE */
- /* FG_Longitude = ( -93.15 ) * DEG_TO_RAD; */
- /* FG_Latitude = ( 45.15 ) * DEG_TO_RAD; */
- /* FG_Altitude = FG_Runway_altitude + 3.758099; */
-
- /* A random test position */
- /* FG_Longitude = ( 88128.00 / 3600.0 ) * DEG_TO_RAD; */
- /* FG_Latitude = ( 93312.00 / 3600.0 ) * DEG_TO_RAD; */
- FG_Runway_altitude = 4000.0;
- FG_Altitude = FG_Runway_altitude + 3.758099;
+ fgAircraftInit(); // In the future this might not be the case.
+ f = current_aircraft.flight;
- printf("Initial position is: (%.4f, %.4f, %.2f)\n",
- FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
- FG_Altitude * FEET_TO_METER);
+ // Initial Position at (P13) Globe, AZ
+ FG_Longitude = ( -110.6642444 ) * DEG_TO_RAD;
+ FG_Latitude = ( 33.3528917 ) * DEG_TO_RAD;
+ FG_Runway_altitude = (3234.5 + 300);
+ FG_Altitude = FG_Runway_altitude + 3.758099;
- /* Initial Velocity */
+ // Initial Position at (E81) Superior, AZ
+ // FG_Longitude = ( -111.1270650 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 33.2778339 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = (2646 + 100);
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position at (TUS) Tucson, AZ
+ // FG_Longitude = ( -110.9412597 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 32.1162439 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = (2641 + 0);
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position at (SEZ) SEDONA airport
+ // FG_Longitude = (-111.7884614 + 0.01) * DEG_TO_RAD;
+ // FG_Latitude = ( 34.8486289 - 0.015) * DEG_TO_RAD;
+ // FG_Runway_altitude = (4827 + 450);
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position at near Anchoraze, AK
+ // FG_Longitude = ( -152.00 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 61.17 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = (0);
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position at (HSP) Hot Springs, VA
+ // FG_Longitude = (-79.8338964 + 0.01) * DEG_TO_RAD;
+ // FG_Latitude = ( 37.9514564 + 0.008) * DEG_TO_RAD;
+ // FG_Runway_altitude = (3792 + 1300);
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position at (ANE) Anoka County airport
+ // FG_Longitude = -93.2113889 * DEG_TO_RAD;
+ // FG_Latitude = 45.145 * DEG_TO_RAD;
+ // FG_Runway_altitude = 912;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position north of the city of Globe
+ // FG_Longitude = ( -398673.28 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 120625.64 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Longitude = ( -397867.44 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 119548.21 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Altitude = 0.0 + 3.758099;
+
+ // Initial Position near where I used to live in Globe, AZ
+ // FG_Longitude = ( -398757.6 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 120160.0 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 4000.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position: 10125 Jewell St. NE
+ // FG_Longitude = ( -93.15 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 45.15 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 950.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position: Somewhere near the Grand Canyon
+ // FG_Longitude = ( -112.5 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 36.5 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 8000.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position: (GCN) Grand Canyon Airport, AZ
+ // FG_Longitude = ( -112.1469647 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 35.9523539 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 6606.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position: Jim Brennon's Kingmont Observatory
+ // FG_Longitude = ( -121.1131667 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 38.8293917 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 920.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // probably interesting for european team members
+ // That is: If I can get the scenery to work -;) (Durk)
+
+ // Initial Position: Groningen Airport Eelde, the netherlands
+ // FG_Longitude = ( 6.583333 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 53.125 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 920.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Initial Position: Schiphol Amsterdam Airport, the netherlands
+ // FG_Longitude = ( -4.7641667 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 52.308056 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 920.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Eclipse Watching w73.5 n10 (approx) 18:00 UT
+ // FG_Longitude = ( -73.5 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 10.0 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 0.0;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // Test Position
+ // FG_Longitude = ( -139.5 ) * DEG_TO_RAD;
+ // FG_Latitude = ( -9.5 ) * DEG_TO_RAD;
+ // FG_Runway_altitude = 13000.0 * METER_TO_FEET;
+ // FG_Altitude = FG_Runway_altitude + 3.758099;
+
+ // A random test position
+ // FG_Longitude = ( 88128.00 / 3600.0 ) * DEG_TO_RAD;
+ // FG_Latitude = ( 93312.00 / 3600.0 ) * DEG_TO_RAD;
+
+ fgPrintf( FG_GENERAL, FG_INFO,
+ "Initial position is: (%.4f, %.4f, %.2f)\n",
+ FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
+ FG_Altitude * FEET_TO_METER);
+
+ /* Initial Velocity */
FG_V_north = 0.0 /* 7.287719E+00 */;
FG_V_east = 0.0 /* 1.521770E+03 */;
FG_V_down = 0.0 /* -1.265722E-05 */;
/* Initial Orientation */
FG_Phi = -2.658474E-06;
FG_Theta = 7.401790E-03;
- FG_Psi = 270.0 * DEG_TO_RAD;
+ FG_Psi = 260.0 * DEG_TO_RAD;
/* Initial Angular B rates */
FG_P_body = 7.206685E-05;
/* fgSlewInit(-335340,162540, 15, 4.38); */
/* fgSlewInit(-398673.28,120625.64, 53, 4.38); */
+ /* Initialize the event manager */
+ fgEventInit();
+
+ /* Dump event stats every 60 seconds */
+ fgEventRegister( "fgEventPrintStats()", fgEventPrintStats,
+ FG_EVENT_READY, 60000 );
+
/* Initialize "time" */
fgTimeInit(t);
fgTimeUpdate(f, t);
- /* Initialize shared sun position and sun_vec */
- fgUpdateSunPos(scenery.center);
+ /* fgViewUpdate() needs the sun in the right place, while
+ * fgUpdateSunPos() needs to know the view position. I'll get
+ * around this interdependency for now by calling fgUpdateSunPos()
+ * once, then moving on with normal initialization. */
+ fgUpdateSunPos();
/* Initialize view parameters */
fgViewInit(v);
+ fgViewUpdate(f, v, l);
/* Initialize the weather modeling subsystem */
fgWeatherInit();
+ /* update the weather for our current position */
+ fgEventRegister( "fgWeatherUpdate()", fgWeatherUpdate,
+ FG_EVENT_READY, 120000 );
+
/* Initialize the Cockpit subsystem */
- /*
- if( fgCockpitInit( current_aircraft ) == NULL )
- {
- printf( "Error in Cockpit initialization!\n" );
- exit( 1 );
+ if( fgCockpitInit( ¤t_aircraft )) {
+ // Cockpit initialized ok.
+ } else {
+ fgPrintf( FG_GENERAL, FG_EXIT, "Error in Cockpit initialization!\n" );
}
- */
- /* Initialize Astronomical Objects */
- fgAstroInit();
+ // Initialize the orbital elements of sun, moon and mayor planets
+ fgSolarSystemInit(*t);
+
+ // Initialize the Stars subsystem
+ if( fgStarsInit() ) {
+ // Stars initialized ok.
+ } else {
+ fgPrintf( FG_GENERAL, FG_EXIT, "Error in Stars initialization!\n" );
+ }
+
+ // Initialize the planetary subsystem
+ fgEventRegister("fgPlanetsInit()", fgPlanetsInit, FG_EVENT_READY, 600000);
+
+ // Initialize the sun's position
+ fgEventRegister("fgSunInit()", fgSunInit, FG_EVENT_READY, 30000 );
- /* Initialize the "sky" */
+ // Intialize the moon's position
+ fgEventRegister( "fgMoonInit()", fgMoonInit, FG_EVENT_READY, 600000 );
+
+ // Initialize the "sky"
fgSkyInit();
- /* Initialize the Scenery Management subsystem */
- fgSceneryInit();
+ // Initialize the Scenery Management subsystem
+ if ( fgSceneryInit() ) {
+ // Scenery initialized ok.
+ } else {
+ fgPrintf( FG_GENERAL, FG_EXIT, "Error in Scenery initialization!\n" );
+ }
+
- /* Tell the Scenery Management system where we are so it can load
- * the correct scenery data */
- fgSceneryUpdate(FG_Latitude, FG_Longitude, FG_Altitude);
+ if( fgTileMgrInit() ) {
+ // Load the local scenery data
+ fgTileMgrUpdate();
+ } else {
+ fgPrintf( FG_GENERAL, FG_EXIT,
+ "Error in Tile Manager initialization!\n" );
+ }
+ // I'm just sticking this here for now, it should probably move
+ // eventually
+ // cur_elev = mesh_altitude(FG_Longitude * RAD_TO_DEG * 3600.0,
+ // FG_Latitude * RAD_TO_DEG * 3600.0); */
+ // fgPrintf( FG_GENERAL, FG_INFO,
+ // "True ground elevation is %.2f meters here.\n",
+ // cur_elev); */
- /* I'm just sticking this here for now, it should probably move
- * eventually */
- cur_elev = mesh_altitude(FG_Longitude * RAD_TO_DEG * 3600.0,
- FG_Latitude * RAD_TO_DEG * 3600.0);
- printf("Ground elevation is %.2f meters here.\n", cur_elev);
+ cur_elev = FG_Runway_altitude * FEET_TO_METER;
if ( cur_elev > -9990.0 ) {
FG_Runway_altitude = cur_elev * METER_TO_FEET;
}
if ( FG_Altitude < FG_Runway_altitude ) {
FG_Altitude = FG_Runway_altitude + 3.758099;
}
- printf("Updated position is: (%.4f, %.4f, %.2f)\n",
- FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
- FG_Altitude * FEET_TO_METER);
- /* end of thing that I just stuck in that I should probably move */
+ fgPrintf(FG_GENERAL, FG_INFO,
+ "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
+ FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
+ FG_Altitude * FEET_TO_METER);
+ /* end of thing that I just stuck in that I should probably move */
+
/* Initialize the flight model subsystem data structures base on
* above values */
+
fgFlightModelInit( FG_LARCSIM, f, 1.0 / DEFAULT_MODEL_HZ );
- /* To HUD or not to HUD */
- show_hud = 1;
+ // To HUD or not to HUD - Now a command line issue
+ // show_hud = 0;
+
+ // Let's not show the instrument panel
+ displayInstruments = 0;
- /* Joystick support */
- fgJoystickInit( 0 );
+ // Joystick support
+ if (fgJoystickInit(0) ) {
+ // Joystick initialized ok.
+ } else {
+ fgPrintf( FG_GENERAL, FG_EXIT, "Error in Joystick initialization!\n" );
+ }
+
+ // One more try here to get the sky synced up
+ fgSkyColorsInit();
+ ret_val = 0;
+
+ fgPrintf(FG_GENERAL, FG_INFO,"\n");
+ return ret_val;
}
/* $Log$
-/* Revision 1.20 1997/12/18 23:32:33 curt
-/* First stab at sky dome actually starting to look reasonable. :-)
+/* Revision 1.54 1998/04/08 23:35:36 curt
+/* Tweaks to Gnu automake/autoconf system.
/*
+ * Revision 1.53 1998/04/03 22:09:06 curt
+ * Converting to Gnu autoconf system.
+ *
+ * Revision 1.52 1998/03/23 21:24:38 curt
+ * Source code formating tweaks.
+ *
+ * Revision 1.51 1998/03/14 00:31:22 curt
+ * Beginning initial terrain texturing experiments.
+ *
+ * Revision 1.50 1998/03/09 22:46:19 curt
+ * Minor tweaks.
+ *
+ * Revision 1.49 1998/02/23 19:07:59 curt
+ * Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
+ * calculation code between sun display, and other FG sections that use this
+ * for things like lighting.
+ *
+ * Revision 1.48 1998/02/21 14:53:15 curt
+ * Added Charlie's HUD changes.
+ *
+ * Revision 1.47 1998/02/19 13:05:53 curt
+ * Incorporated some HUD tweaks from Michelle America.
+ * Tweaked the sky's sunset/rise colors.
+ * Other misc. tweaks.
+ *
+ * Revision 1.46 1998/02/18 15:07:06 curt
+ * Tweaks to build with SGI OpenGL (and therefor hopefully other accelerated
+ * drivers will work.)
+ *
+ * Revision 1.45 1998/02/16 13:39:43 curt
+ * Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
+ * tiles to occasionally be missing.
+ *
+ * Revision 1.44 1998/02/12 21:59:50 curt
+ * Incorporated code changes contributed by Charlie Hotchkiss
+ * <chotchkiss@namg.us.anritsu.com>
+ *
+ * Revision 1.43 1998/02/11 02:50:40 curt
+ * Minor changes.
+ *
+ * Revision 1.42 1998/02/09 22:56:58 curt
+ * Removed "depend" files from cvs control. Other minor make tweaks.
+ *
+ * Revision 1.41 1998/02/09 15:07:50 curt
+ * Minor tweaks.
+ *
+ * Revision 1.40 1998/02/07 15:29:44 curt
+ * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
+ * <chotchkiss@namg.us.anritsu.com>
+ *
+ * Revision 1.39 1998/02/03 23:20:25 curt
+ * Lots of little tweaks to fix various consistency problems discovered by
+ * Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
+ * passed arguments along to the real printf(). Also incorporated HUD changes
+ * by Michele America.
+ *
+ * Revision 1.38 1998/02/02 20:53:58 curt
+ * Incorporated Durk's changes.
+ *
+ * Revision 1.37 1998/02/01 03:39:54 curt
+ * Minor tweaks.
+ *
+ * Revision 1.36 1998/01/31 00:43:13 curt
+ * Added MetroWorks patches from Carmen Volpe.
+ *
+ * Revision 1.35 1998/01/27 00:47:57 curt
+ * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
+ * system and commandline/config file processing code.
+ *
+ * Revision 1.34 1998/01/22 02:59:37 curt
+ * Changed #ifdef FILE_H to #ifdef _FILE_H
+ *
+ * Revision 1.33 1998/01/21 21:11:34 curt
+ * Misc. tweaks.
+ *
+ * Revision 1.32 1998/01/19 19:27:08 curt
+ * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
+ * This should simplify things tremendously.
+ *
+ * Revision 1.31 1998/01/19 18:40:32 curt
+ * Tons of little changes to clean up the code and to remove fatal errors
+ * when building with the c++ compiler.
+ *
+ * Revision 1.30 1998/01/13 00:23:09 curt
+ * Initial changes to support loading and management of scenery tiles. Note,
+ * there's still a fair amount of work left to be done.
+ *
+ * Revision 1.29 1998/01/08 02:22:08 curt
+ * Beginning to integrate Tile management subsystem.
+ *
+ * Revision 1.28 1998/01/07 03:18:58 curt
+ * Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
+ *
+ * Revision 1.27 1998/01/05 18:44:35 curt
+ * Add an option to advance/decrease time from keyboard.
+ *
+ * Revision 1.26 1997/12/30 23:09:04 curt
+ * Tweaking initialization sequences.
+ *
+ * Revision 1.25 1997/12/30 22:22:33 curt
+ * Further integration of event manager.
+ *
+ * Revision 1.24 1997/12/30 20:47:44 curt
+ * Integrated new event manager with subsystem initializations.
+ *
+ * Revision 1.23 1997/12/30 16:36:50 curt
+ * Merged in Durk's changes ...
+ *
+ * Revision 1.22 1997/12/19 23:34:05 curt
+ * Lot's of tweaking with sky rendering and lighting.
+ *
+ * Revision 1.21 1997/12/19 16:45:00 curt
+ * Working on scene rendering order and options.
+ *
+ * Revision 1.20 1997/12/18 23:32:33 curt
+ * First stab at sky dome actually starting to look reasonable. :-)
+ *
* Revision 1.19 1997/12/17 23:13:36 curt
* Began working on rendering a sky.
*