VEGA实用编程手册4

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更多发布于：2006-04-04 14:17

<H2 >Vega Observer(vgObserver)</H2>
The Vega Observer is a collection of attributes and references to Vega class descriptors that together describe a visual representation. The funcions specify the characterisitcs, position and control visual representations within the Vega system. 
The observer may look at several channels, but the observer can only be associated with one scene, one graphic state, on player, and one motion model.
<H3 >Vega Observer Functions</H3>
vgObserver * vgNewObserv ( void ); 
vgObserver * vgFindObserv ( const char *name ); 
vgObserver * vgGetObserv ( int idx ); 
int vgGetNumObserv ( void ); 
void vgObservStressLevel ( vgObserver *obs, float low, float high, float ramp ); 
void vgGetObservStressLevel ( vgObserver *obs, float *low, float *high, float *ramp ); 
void vgObservScene ( vgObserver *obs , vgScene *scene ); 
vgScene * vgGetObservScene ( vgObserver *obs ); 
void vgObservGfx ( vgObserver *obs, vgGfx *gfx ); 
vgGfx * vgGetObservGfx ( vgObserver *obs ); 
void vgObservMot ( vgObserver *obs, vgMotion *mot ); 
vgMotion * vgGetObservMot ( vgObserver *obs ); 
void vgObservNav ( vgObserver *obs, vgNavigator *nav ); 
vgNavigator * vgGetObservNav ( vgObserver *obs ); 
void vgObservVol ( vgObserver *obs, vgVolume *vol ); 
vgVolume * vgGetObservVol ( vgObserver *obs ); 
void vgAddObservIsect ( vgObserver *obs, vgIsector *isect ); 
int vgRemObservIsect ( vgObserver *obs, vgIsector *isect ); 
int vgGetObservNumIsect ( vgObserver *obs ); 
vgIsector * vgGetObservIsect ( vgObserver *obs, int _index ); 
void vgObservIDev ( vgObserver *obs, vgIDev *input ); 
vgIDev * vgGetObservIDev ( vgObserver *obs ); 
void vgAddObservChan ( vgObserver *obs, vgChannel *chan ); 
int vgRemObservChan ( vgObserver *obs, vgChannel *chan ); 
int vgGetObservNumChan ( vgObserver *obs ); 
vgChannel * vgGetObservChan ( vgObserver *obs, int _index ); 
void vgAddObservEnv ( vgObserver *obs, vgEnv *env ); 
int vgRemObservEnv ( vgObserver *obs, vgEnv *env ); 
int vgGetObservNumEnv ( vgObserver *obs ); 
vgEnv * vgGetObservEnv ( vgObserver *obs, int _index ); 
void vgObservEnv ( vgObserver *obs, vgEnv *env ); 
void vgObservPlyr ( vgObserver *obs, vgPlayer *plyr ); 
vgPlayer * vgGetObservPlyr ( vgObserver *obs ); 
void vgObservTetherPos ( vgObserver *obs, vgPosition *pos ); 
void vgGetObservTetherPos ( vgObserver *obs, vgPosition *pos ); 
void vgObservTetherOffset ( vgObserver *obs, float x, float y, float z); 
void vgGetObservTetherOffset ( vgObserver *obs, float *x, float *y, float *z ); 
void vgObservLookatPos ( vgObserver *obs, vgPosition *pos ); 
vgPosition * vgGetObservLookatPos ( vgObserver *obs ); 
void vgObservLookatObj ( vgObserver *obs, vgObject *obj ); 
vgObject * vgGetObservLookatObj ( vgObserver *obs ); 
void vgObservLookatPlyr ( vgObserver *obs, vgPlayer *plyr ); 
vgPlayer * vgGetObservLookatPlyr ( vgObserver *obs ); 
void vgObservChanShareMask ( vgObserver *obs, int mask); 
int vgGetObservChanShareMask ( vgObserver *obs ); 
<H3 >Vega Observer回调函数</H3>
VGOBS_ADD_ENV – adding an environment
VGOBS_REM_ENV – removing an environment
<H3 >Vega Observer Properties</H3>
VGOBS_STATE observer state attribute
VGOBS_PLYRCLOAK render geometry associated with plyr
VGOBS_STEREOSEP separation of viewpoint
VGOBS_STEREORNG range of viewpoint convergence(收敛)
VGOBS_HAT return height above terrain
VGOBS_STRESS enable/disable load management
VGOBS_LOOKAT_TARGET specify target for observer
VGOBS_TEHTERSTATE
VGOBS_TETHERCOORD
VGOBS_MAXTLIST
VGOBS_TLAG
VGOBS_SPINRAD
VGOBS_SPINDELTA
VGOBS_SPINELEV
<H2 >Vega Scene(vgScene)</H2>
A Vega Scene (vgScene) is a collection of objects that can be viewed by an observer. Vega can manage any number of scenes at one time, and multiple observers can view the same scene simultaneously.
<H3 >Vega Scene Functions</H3>
vgScene * vgNewScene ( void ); 
vgScene * vgNewSceneCopy ( const vgScene *scene ); 
vgScene * vgFindScene ( const char *name ); 
vgScene * vgGetScene ( int idx ); 
int vgGetNumScene ( void ); 
void vgAddSceneObj ( vgScene *sc, vgObject *obj ); 
int vgGetSceneNumObj ( vgScene *sc ); 
vgObject * vgGetSceneObj ( vgScene *sc, int idx ); 
void vgRemSceneObj ( vgScene *sc, vgObject *obj ); 
void vgOptimizeScene ( vgScene *sc, unsigned optim ); 
<H2 >Vega Data Set（vgDataset）</H2>
The Vega Data Set Functions (vgDataset) is the basic mechanism Vega uses to bring data into the system. A data set is conceptually any collection of data.
<H3 >Vega Data Set Functions</H3>
vgDataSet * vgNewDS ( void ); 
vgDataSet * vgNewDSCopy ( const vgDataSet *src ); 
vgDataSet * vgFindDS ( const char *name ); 
vgDataSet * vgGetDS ( int _index ); 
int vgGetNumDS ( void ); 
ERR vgLoadDS ( vgDataSet *ds ); 
ERR vgUnloadDS ( vgDataSet *ds ); 
int vgMakeDS ( vgDataSet *ds, void *data, vgDSType type ); 
int vgDSLoader ( void *(*loader)(char *), vgDSType type, char *ext ); 
int vgFilePath ( const char *path ); 
void vgAddDSTex ( vgDataSet *ds, vgTexture *<st1:State w:st="on"><st1:place w:st="on">tex</st1:place></st1:State> ); 
<H3 >Example: Naming a dataset</H3>
vgDataset myDataset
myDAtaset=vgNewDS(); 
vgName(myDataset, "egg.flt");
<H3 >Vega Data Set回调函数</H3>
 
 VGDS_PRELOAD Called before a file is loaded. Called from
 the DBASE process.
 VGDS_MGFLTBEAD Add a callback which is called every time a new
 bead is read from the MultiGen flight file.
 (flt loader only) This is called from 
 the DBASE process.
 VGDS_POSTLOAD Called after a file is loaded. Called from the
 DBASE process.
 VGDS_STATE_CHANGE Get notified when the dataset changes state
 (i.e. is loaded or unloaded).
 This is called from the APP process.
 VGDS_POSTTEXLOAD Invoked after all textures for an dataset have
 been downloaded.
<H3 >Vega Data Set properties</H3>
VGDS_TYPE
VGDS_ISLOADED
VGDS_USED
VGDS_IMMEDIATE
VGDS_USEPROJECTION
VGDS_CURRPROJECTION
VGDS_CURRORIGLAT
VGDS_CURRORIGLONG
VGDS_CREATECONSTRAINTS

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VEGA实用编程手册4

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