source: osgVisual/trunk/include/sky_Silverlining/visual_skySilverLining.h @ 247

Last change on this file since 247 was 247, checked in by Torben Dannhauer, 13 years ago

typo fix, clean up

File size: 23.4 KB
Line 
1#pragma once
2/* -*-c++-*- osgVisual - Copyright (C) 2009-2011 Torben Dannhauer
3 *
4 * This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under
5 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
6 * (at your option) any later version.  The full license is in LICENSE file
7 * included with this distribution, and on the openscenegraph.org website.
8 *
9 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
10 * You have to aquire licenses for all used proprietary modules.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * OpenSceneGraph Public License for more details.
16 *
17 * This file is based on the OSG example of the Silverlining SDK:
18 * Copyright (c) 2008 Sundog Software, LLC. All rights reserved worldwide.
19*/
20
21#include <osg/NodeCallback>
22#include <osg/Geode>
23
24#include <SilverLining.h>
25#include <MillisecondTimer.h>
26#ifdef WIN32
27        #include <windows.h>
28#endif
29#include <skySilverLining_skyDrawable.h>
30#include <skySilverLining_cloudsDrawable.h>
31#include <skySilverLining_AtmosphereReference.h>
32#include <skySilverLining_ProjectionMatrixCallback.h> 
33#include <skySilverLining_cloudLayerSlot.h>
34
35#include <visual_util.h>
36
37// XML Parser
38#include <stdio.h>
39#include <libxml/parser.h>
40#include <libxml/tree.h>
41#include <sstream> 
42
43namespace osgVisual
44{
45
46#define MAX_CLOUDLAYER_SLOTS 5
47/**
48 * \brief This class is the container class for the sky, stars and clouds
49 *
50 * This class is the container class for the sky, stars and clouds. It is responsible for initialization and updating of the sky system.
51 * It is realized as Geode that it is possible to install an updateCallback on this class.
52 * This way, the sky position is always updated during update traversal of the scene graph.
53 *
54 * The NodeCallback class is nested into this class that no external user can use this callback.
55 *
56 * @todo Add Cloudlayer->set/getalpha() function
57 * @todo Terrain shadows do not exist
58 * @todo Calibrate visual range with test objects. Populate a Lookuptable to use for true visibility ranges.
59 * @todo Implement an abstract sky interface class to allow other sky implementations than silverlining with identical interfaces
60 *
61 * @author Torben Dannhauer
62 * @date  Jul 2009
63 */ 
64class visual_skySilverLining : public osg::Geode
65{
66        //#include <leakDetection.h>
67public:
68        /**
69         * \brief Constructor.
70         *
71         * @param viewer_ : Pointer to the applications viewer
72         * @param configFileName : Filename of the XML configfile to read the configuration from. Currently not used because skySilverlining currently does not need any configuration parameters.
73         * @param disabled : Flag to the caller which indicates if the sky was enabled or disabled by the XML configuration file.
74         */ 
75        visual_skySilverLining(osgViewer::Viewer* viewer_, std::string configFileName, bool& disabled);
76
77        /**
78         * \brief Destrcutor: The updateCallback is removed and the atmosphere, if instantiated.
79         *
80         */ 
81        virtual ~visual_skySilverLining(void);
82
83        /**
84         * \brief Returns a Pointer to the atmosphere object.
85         *
86         * @return Pointer to the atmosphere object.
87         */ 
88        SilverLining::Atmosphere* getAtmosphere() {return atmosphere;};
89
90        /**
91         * \brief Checks if the sky system is initialized.
92         *
93         * Checks if the sky system is initialized. If not, it makes a deep lookup at the main cameras userdata, if atmosphere is initialized.
94         * If this returns true, the local variable is updated with ne new initialize status. If this deep lookup returns false, this method returns also false
95         * asks the cameras user data if initialzed. If that is
96         *
97         * @return : Returns the status of initialization.
98         */ 
99        bool isInitialized();
100       
101        /**
102         * \brief This function initializes the sky framework if its used with a PRE_RENDER camera like the distortion module.
103         *
104         * @param distortedRoot : osg::Group* which is the rootNode over distortion and scene
105         * @param sceneGraphRoot : osg::Group* which is the rootNode and coordinateSystemNode of the scene.
106         */ 
107        void init(osg::Group *distortedRoot, osg::CoordinateSystemNode *sceneGraphRoot);
108
109        /**
110         * \brief This function can be called by the updateCallback. If the postInitialization for adding clouds etc. has be called already, this function will skip.
111         *
112         * If this function is called before sky is initalized, all actions are skipped.
113         * A standart usage is adding objects like clouds and winds, configuring time, location and visibility.
114         *
115         */ 
116        void postInit();
117
118        /**
119         * \brief This function shuts the sky framework down.
120         *
121         */ 
122        void shutdown();
123
124
125/** @name Time
126 *  The following functions control the simulated time and date.
127 */
128//@{
129        /**
130         * \brief Sets the new Date and Time to the sky system.
131         *
132         * Update is only performed if the sky systme is initialized.
133         *
134         * @param year_ : Year to set. SilverLining can only handle Gregorian calendar years, which means that years before 1582 will not be accurately simulated.
135         * @param month_ : Month to set. Ranging from 1 (Jan) to 12 (Dec)
136         * @param day_ : Day to set Ranging from 1 to 31
137         * @param hour_ : Hour to set. Ranging from 0 to 23
138         * @param minute_ : Minute to set. Ranging from 0 to 59.
139         * @param second_ : Second to set. Ranging from 0 to 59.
140         * @param daylightSaving_ : Configures, if the configured DateTime is in daylight savings or without daylight savings.
141         * @param timezoneOffset_ : Configures the timezone. Hour offset from GMT, ignoring daylight savings time.
142         */ 
143        void setDateTime( int year_, int month_, int day_, int hour_, int minute_, int second_, bool daylightSaving_, double timezoneOffset_ );
144
145        /**
146         * \brief Set time for the sky system. Only values >0 are set.
147         *
148         * @param hour_ : Hour to set. Ranging from 0 to 23
149         * @param minute_ : Minute to set. Ranging from 0 to 59.
150         * @param second_ : Second to set. Ranging from 0 to 59.
151         */ 
152        void setTime( int hour_, int minute_, int second_ );
153
154        /**
155         * \brief Sets the date for the sky system. Only values >0 are set.
156         *
157         * @param year_ : Year to set. SilverLining can only handle Gregorian calendar years, which means that years before 1582 will not be accurately simulated.
158         * @param month_ : Month to set. Ranging from 1 (Jan) to 12 (Dec)
159         * @param day_ : Day to set Ranging from 1 to 31
160         */ 
161        void setDate( int year_, int month_, int day_ );
162
163        /**
164         * \brief Configures the date and time by epoche (Seconds elapsed since midnight, January 1, 1970 UTC)
165         *
166         * This function ignores the daylight savings and timezone.
167         *
168         * @param secondsSince1970_ : Seconds elapsed since midnight, January 1, 1970 UTC
169         */ 
170        void setDateByEpoch(int secondsSince1970_ );
171
172//@}
173
174/** @name Location
175 *  The following functions control the location to simulate.
176 */
177//@{
178        /**
179         * \brief Configures the sky system to simulate a specific location.
180         *
181         * @param lat_ : Latitude in radians
182         * @param lon_ : Longitude in radians
183         * @param alt_ : Altimeter in meters above see level.
184         */ 
185        void setLocation(double lat_, double lon_, double alt_);
186//@}
187
188/** @name Visibility and Haze
189 *  The following functions control the atmosperic effects like visibility range and haze.
190 */
191//@{
192        /**
193         * \brief This functions sets the visibility range in meters to simulate.
194         *
195         * @param visibility_ : Visibility range in meters.
196         */ 
197        void setVisibility(double visibility_);
198
199        /**
200         * \brief This function returns the visibility range in meters which is simulated.
201         *
202         * @return : Visibility range in meters.
203         */ 
204        double getVisibility();
205
206        /**
207         * \brief This function sets the haze factor to simulate.
208         *
209         * 1 = Pure air, range 256 km
210         * 2 = very clear, range 50 km
211         * 3 = clear, range 15 km
212         * 7 = light haze, range 8 km
213         * 20 = haze, range 3 km
214         * 50 = thin fog, range 2 km
215         *
216         * @param turbidity_ : Haze factor to simulate.
217         */ 
218        void setTurbidity(double turbidity_);
219
220        /**
221         * \brief This function returns the simulated haze factor.
222         *
223         * @return : Haze factor.
224         */ 
225        double getTurbidity();
226//@}
227
228/** @name Light pollution
229 *  The following functions control the light pollution to simulate at night.
230 */
231//@{
232        /**
233         * \brief This functions sets the light pollution in Watt/m2
234         *
235         * @param lightPollution_ : Light pollution to set.
236         */ 
237        void setLightPollution(double lightPollution_);
238
239        /**
240         * \brief This function returns the simulated light pollution in Watt/m2.
241         *
242         * @return : Light pollution in Watt/m2
243         */ 
244        double getLightPollution();
245//@}
246
247/** @name Clouds
248 *  The following functions control the available slots for cloudLayer. In each slot a cloud layer can be adde and its perscpitation or
249 * baseAltitude updated. All other values are not updateable, therefore a delete and recreation of the cloud layer would be necessary.
250 */
251//@{
252        /**
253         * \brief This function adds a Cloudlayer to a sepcified SLOT. If the slot is used, this function returns immediately.
254         *
255         * If the slot number is out of range, nothing happens.
256         *
257         * Currently supported CloudTypes are:
258         *
259         * \li CloudTypes::CIRROCUMULUS - High planar cloud puffs.
260         * \li CloudTypes::CIRRUS_FIBRATUS - High, thicker and fibrous clouds that signal changing weather.
261     * \li CloudTypes::STRATUS - Low clouds represented as a slab.
262     * \li CloudTypes::CUMULUS_MEDIOCRIS - Low, puffy clouds on fair days.
263     * \li CloudTypes::CUMULUS_CONGESTUS - Large cumulus clouds that could turn into a thunderhead.
264         * \li CloudTypes::CUMULONIMBUS_CAPPILATUS - A large thunderhead with lightning and rain.
265     * \li CloudTypes::STRATOCUMULUS - Low, dense, puffy clouds with some sun breaks between them.
266     *  the camera location at all times, to create the illusion of an infinitely large cloud layer.
267         *
268         * @param slot_ : Slot to use.
269         * @param baseLength_ : Baselength in meter of the cloud layer to generate.
270         * @param baseWidth_ : Basewideth in meter of the cloud layer to generate.
271         * @param thickness_ : Thicknes of the could layer in meter.
272         * @param baseHeight_ : Height of the cloud base in WGS84.
273         * @param density_ : Coverage of the cloud layer in percent (0.0 - 1.0).
274         * @param cloudtype_ : Type of the cloudlayer to generate.
275         */ 
276        void addCloudLayer(int slot_, double baseLength_, double baseWidth_, double thickness_, double baseHeight_, double density_, CloudTypes cloudtype_ );
277
278        /**
279         * \brief This function remove the cloudlayer in the specified slot and marks the slot as free.
280         *
281         * If the slot number is out of range, nothing happens.
282         *
283         * @param slot_ : Slot number to clean
284         */ 
285        void removeCloudLayer( int slot_ );
286       
287        /**
288         * \brief This function removes the cloud layers from all slots
289         *
290         */ 
291        void clearAllSlots();
292
293        /**
294         * \brief This function returns a pointer to the cloudLayer this slot contains.
295         *
296         * If the slot number is out of range, nothing happens.
297         *
298         * @param slot_ : Slot to query for it's cloudLayer pointer.
299         * @return : Pointer to the contained cloud layer.
300         */ 
301        SilverLining::CloudLayer* getCloudLayer( int slot_ );
302       
303        /**
304         * \brief This function configure the cloud layer als enabled (show clouds) or disabled (hide clouds).
305         *
306         * If the slot number is out of range, nothing happens.
307         *
308         * @param slot_ : Cloudlayer to hide/show.
309         * @param enabled_ : Control where hide or show should be configured.
310         */ 
311        void setEnabled(int slot_, bool enabled_ );
312
313        /**
314         * \brief This function returns if the specified cloud layer is en- or disabled (hidden or shown).
315         *
316         * If the slot number is out of range, nothing happens.
317         *
318         * @param slot_ : Slot zu query.
319         * @return : true if clouds are visible, false if clouds are hidden.
320         */ 
321        bool isEnabled( int slot_ );
322
323        /**
324         * \brief This functions fade the clouds in or out, depending on the visibility tsatus before.
325         *
326         * If the slot number is out of range, nothing happens.
327         *
328         * @param slot_ : Slot to fade.
329         * @param fadetimeMS_ : Milliseconds to fade the cloud layer.
330         */ 
331        void fadeVisibility( int slot_, int fadetimeMS_);
332
333        /**
334         * \brief
335         *
336         * If the slot number is out of range, nothing happens.
337         *
338         * @param slot_
339         * @return : String with the literal name of the cloud layer type.
340         */ 
341        std::string getCloudLayerTypeName( int slot_ );
342
343//@}
344
345/** @name Wind
346 *  Description of wind. Attention: Wind volumes are not geocentric: If far enough away from upvector location, the earth will curve away under the wind volume.
347 */
348//@{
349        /**
350         * \brief This function adds a wind volume to the scene, with the specified characteristics.
351         *
352         * @param bottom_ : Height in WGS84 in metern of the wind volumes bottom.
353         * @param top_ : Height in WGS84 in metern of the wind volumes top.
354         * @param speed_ : Windspeed in the wind volume in meter per seconds.
355         * @param direction_ : Wind direction in the wind volume in degree (wind origin, not wind destination).
356         *
357         */ 
358        void addWindVolume(double bottom_, double top_, double speed_, int direction_);
359
360        /**
361         * \brief This function deletes all wind volumes.
362         *
363         */ 
364        void clearAllWindVolumes();
365
366        /**
367         * \brief This functions checks wether the specified altitude in MSL is inside a wind volume.
368         *
369         * If multiple wind volumes are nested, this function returns the first matching wind volume.
370         * Because geocentric wind is not implemented, the altitude information is always base on the location where the wind was added.
371         * To avoid multiple winds, don't use nested wind volumes.
372         *
373         * @param height_ : Height in meters in WGS84 to check for wind.
374         * @param bottom_ : If checking altitude is inside a volume, the bottom altitude of the volume in meters above MSL is written into, otherwise -1.
375         * @param top_ : If checking altitude is inside a volume, the top altitude of the volume in meters above MSL is written into, otherwise -1.
376         * @param speed_ : If checking altitude is inside a volume, the wind speed in the wind volume is written into, otherwise -1.
377         * @param direction_ : If checking altitude is inside a volume, the wind direction (0 deg = from north, 90 deg = from east) in the wind volume is written into, otherwise -1.
378         * @return : True if checking altitude is inside a wind volume, otherwise false.
379         */ 
380        bool insideWind(double height_, double& bottom_, double& top_, double& speed_, double& direction_);
381
382       
383//@}
384
385/** @name Precipitation
386 *  The following functions control the rate and type of precipitation. It is possible to configure it on an global or a per cloud basis.
387 */
388//@{
389        // Per SLOT
390        /**
391         * \brief This functions enables the specified precipitation rate and precipitation type at the specified cloudLayer slot.
392         *
393         * @param slot_ : CloudLayer slot to enable precipitation in.
394         * @param rate_mmPerHour_rain_ : Precipitation rate in mm/hour of rain.
395         * @param rate_mmPerHour_drySnow_ : Precipitation rate in mm/hour of dry snow.
396         * @param rate_mmPerHour_wetSnow_ : Precipitation rate in mm/hour of wet snow.
397         * @param rate_mmPerHour_sleet_ : Precipitation rate in mm/hour of sleet.
398         */ 
399        void setSlotPrecipitation( int slot_, double rate_mmPerHour_rain_, double rate_mmPerHour_drySnow_, double rate_mmPerHour_wetSnow_, double rate_mmPerHour_sleet_ );
400
401        /**
402         * \brief This function retrieves the precipitation of a cloudlayer slot.
403         *
404         * @param slot_ : Slot to check for precipitation.
405         * @param rate_mmPerHour_rain : Precipitation rate in mm/hour of rain.
406         * @param rate_mmPerHour_drySnow : Precipitation rate in mm/hour of dry snow.
407         * @param rate_mmPerHour_wetSnow : Precipitation rate in mm/hour of wet snow.
408         * @param rate_mmPerHour_sleet : Precipitation rate in mm/hour of sleet.
409         * @return : True if cloudLayer has precipitation.
410         */ 
411        bool getSlotPrecipitation( int slot_, double& rate_mmPerHour_rain, double& rate_mmPerHour_drySnow, double& rate_mmPerHour_wetSnow, double& rate_mmPerHour_sleet );
412       
413        /**
414         * \brief This function checks a specified location for precipitation at the specified cloudLayer slot.
415         *
416         * @param slot_ : CloudLayer slot to check for specification.
417         * @param rate_mmPerHour_rain : Precipitation rate in mm/hour of rain.
418         * @param rate_mmPerHour_drySnow : Precipitation rate in mm/hour of dry snow.
419         * @param rate_mmPerHour_wetSnow : Precipitation rate in mm/hour of wet snow.
420         * @param rate_mmPerHour_sleet : Precipitation rate in mm/hour of sleet.
421         * @param lat_ : Latitude to check for precipitation. If it defaults to -1, the internal sky latitude will be used.
422         * @param lon_ : Longitude to check for precipitation. If it defaults to -1, the internal sky longitude will be used.
423         * @param height_ : Height in WGS84 to check for precipitation. If it defaults to -1, the internal sky height will be used.
424         * @return : Returns true if precipitation at the specified location is true. 
425         */ 
426        bool getSlotPrecipitationAtLocation( int slot_, double& rate_mmPerHour_rain, double& rate_mmPerHour_drySnow, double& rate_mmPerHour_wetSnow, double& rate_mmPerHour_sleet, double lat_=-1, double lon_=-1, double height_=-1 );
427
428        /**
429         * \brief This function clears all types of precipitation of the specified slot.
430         *
431         * @param slot_ : Slot toe clear precipitation.
432         */ 
433        void clearAllPrecipitation( int slot_ );
434
435        // Global
436        /**
437         * \brief This function clears the global precipitation.
438         *
439         */ 
440        void clearGlobalPrecipitation();
441
442        /**
443         * \brief This function sets the cloud independent, global precipitation.
444         *
445         * @param rate_mmPerHour_rain_ : Precipitation rate in mm/hour of rain.
446         * @param rate_mmPerHour_drySnow_ : Precipitation rate in mm/hour of dry snow.
447         * @param rate_mmPerHour_wetSnow_ : Precipitation rate in mm/hour of wet snow.
448         * @param rate_mmPerHour_sleet_ : Precipitation rate in mm/hour of sleet.
449         */ 
450        void setGlobalPrecipitation( double rate_mmPerHour_rain_, double rate_mmPerHour_drySnow_, double rate_mmPerHour_wetSnow_, double rate_mmPerHour_sleet_ );
451       
452        // Misc
453        /**
454         * \brief This function returns the overall precipitation rate of all cloud dependent precipitation.
455         *
456         * This function adds the precipitation of all cloudLayer seperated for all types of precipitation.
457         * Global precipitation is ignored, because precipitation without clouds is artificial and only reasonable for visualiszation purposes.
458         *
459         * @param rate_mmPerHour_rain : Precipitation rate in mm/hour of rain.
460         * @param rate_mmPerHour_drySnow : Precipitation rate in mm/hour of dry snow.
461         * @param rate_mmPerHour_wetSnow : Precipitation rate in mm/hour of wet snow.
462         * @param rate_mmPerHour_sleet : Precipitation rate in mm/hour of sleet.
463         * @param lat_ : Latitude to check for precipitation. If it defaults to -1, the internal sky latitude will be used.
464         * @param lon_ : Longitude to check for precipitation. If it defaults to -1, the internal sky longitude will be used.
465         * @param height_ : Height in WGS84 to check for precipitation. If it defaults to -1, the internal sky height will be used.
466         * @return : True if precipitation lookup was successful.
467         */ 
468        bool getOverallPrecipitationAtLocation( double& rate_mmPerHour_rain, double& rate_mmPerHour_drySnow, double& rate_mmPerHour_wetSnow, double& rate_mmPerHour_sleet, double lat_=-1, double lon_=-1, double height_=-1 );
469//@}
470
471
472/** @name XML configuration
473 *  The following functions provide the XML functionality to configure sky via XML
474 */
475//@{
476        void configureCloudlayerbyXML( xmlNode* cloudlayerNode_ );
477//@}
478
479private:
480        /**
481         * \brief Nested Callback class
482         *
483         * @author Torben Dannhauer
484         * @date  Jul 2009
485         */ 
486        class skyUpdateCallback : public osg::NodeCallback
487        {
488        public:
489                /**
490                 * \brief Constructor
491                 *
492                 * @param csn_ : Pointer to the Coordinate System Node. Necessary to extract lat, lon and height of the camera position.
493                 * @param sceneCamera_ : Pointer to the scene camera (undistorted camera, type PRE_RENDER)
494                 * @param sky_ : Pointer to the sky system.
495                 */ 
496                skyUpdateCallback(osg::CoordinateSystemNode* csn_, osg::Camera* sceneCamera_, visual_skySilverLining* sky_)
497                        : csn(csn_), sceneCamera(sceneCamera_), sky(sky_) {};
498
499                /**
500                 * \brief This function is executed as callback during traversal. It updates the skys displayed location.
501                 *
502                 */ 
503                virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);
504        private:
505                /**
506                 * Referenced pointer to the Coordinate System Node. Necessary to extract lat, lon and height of the camera position.
507                 */ 
508                osg::ref_ptr<osg::CoordinateSystemNode> csn;
509               
510                /**
511                 * Referenced pointer to the scene camera (undistorted camera, type PRE_RENDER)
512                 */ 
513                osg::ref_ptr<osg::Camera> sceneCamera;
514
515                /**
516                 * Referenced pointer to the sky system.
517                 */ 
518                osg::ref_ptr<visual_skySilverLining> sky;
519        };      // Nested class END
520
521        /**
522         * \brief This function updates the atmosphere's upVector,
523         * if delta_lat or delta_lon (from the existing location
524         * and the location of the last upVector update) is larger than N degree.
525         * If an update is requiered, the existing location is noted as the last update location.
526         *
527         * Iis called by this->setLocation.
528         *
529         */ 
530        void updateUpVector();
531
532        /**
533         * Pointer to the atmosphere object of Silverlining.
534         */ 
535        SilverLining::Atmosphere *atmosphere;
536
537        /**
538         * Referenced Pointer to the viewer
539         */ 
540        osg::ref_ptr<osgViewer::Viewer> viewer;
541
542        /**
543         * Referenced Pointer to the camera which pre renders the scene
544         */ 
545        osg::ref_ptr<osg::Camera> sceneCamera;
546 
547        /**
548         * Referenced Pointer to the coordinate system node. Required for WGS84 transformations.
549         */ 
550        osg::ref_ptr<osg::CoordinateSystemNode> sceneRoot;
551
552        /**
553         * Referenced Pointer to the updatecallback, which is installed at this node.
554         */ 
555        osg::ref_ptr<skyUpdateCallback> updateCallback;
556
557        /**
558         * Referenced Pointer to the ProjectionMatrix callback.
559         */ 
560        osg::ref_ptr<skySilverLining_projectionMatrixCallback> cb;
561
562        /**
563         * Referenced Pointer to the sky Drawable, which renders the skybox.
564         */ 
565        osg::ref_ptr<skySilverLining_skyDrawable> skyDrawable;
566
567        /**
568         * Referenced Pointer to the cloudsDrawable, which renders the clouds.
569         */ 
570        osg::ref_ptr<skySilverLining_cloudsDrawable> cloudsDrawable;
571
572        /**
573         * Flag which contains if the sky system is initialized. This status is only a local
574         * copy if the cameras userdata which contain the primary information if the sky system is initialized
575         */ 
576        bool atmosphereInitialized;
577
578        /**
579         * This variable indicates whether postinit() was called already.
580         */ 
581        bool postInitialized;
582
583        /**
584         * This vector contains all available slots for cloud layer.
585         */ 
586        std::vector<cloudLayerSlot> cloudLayerSlots;
587
588                /**
589         * Latitude, which mirrors the latitude of the last sky update. This is neccesary if any weather effect is added to calculate the earth radius on that location for appropriate level above MSL
590         */ 
591        double lat;
592
593        /**
594         * Longitude, which mirrors the latitude of the last sky update. This is neccesary if any weather effect is added to calculate the earth radius on that location for appropriate level above MSL
595         */ 
596        double lon;
597
598        /**
599         * Height, which mirrors the height of the last sky update.
600         */ 
601        double height;
602
603};
604
605using namespace SilverLining;
606
607//class MyMillisecondTimer : public SilverLining::MillisecondTimer
608//{
609//public:
610//      virtual unsigned long GetMilliseconds() const
611//        {
612//                      return timeGetTime() * 50;
613//        }
614//};
615
616
617} // END NAMESPACE
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