改变路径时指定控制点的速度

1、转帖分享怎样在应用程序中改变运动路径中指定控制点的速度？代码下面这段程用于改变运动路径中指定控制点的速度：void setNavMarkerSpeed( const int navIdx,路径索弓 Iconst int pointIdx, 控制点索引const float speed ) 指定速度(char data256;unsigned ctrlptIdx = -1;int eventType = -1;double value = -1;unsigned nbytes = 0;bool idxFound = false;vgSplineNavigator *navigator = vgG

2、etNavigator( navIdx );if( navigator = NULL )return;int render = vgProp( navigator, VGSPLINENAV_RENDER );int navstate = vgProp( navigator, VGCOMMON_ENABLED );vgProp( navigator, VGSPLINENAV_RENDER, VG_OFF );vgProp( navigator, VGCOMMON_ENABLED, VG_OFF );vgUpdate(navigator );int numMarkers = vgGetProp(

3、navigator,VGNAV_NUM_MARKERS);for( int j = 0; j numMarkers; j+ )(vgNavigatorGetMarker( (vgNavigator*)navigator,j,&ctrlptIdx,&eventType,&value,(void*)data,&nbytes );if( eventType = VGSPLINENAV_VELOCITY & pointIdx = ctrlptIdx) ( vgNavigatorMarker( (vgNavigator*)navigator,j,pointIdx,VGSPLINENAV_VELOCITY

4、,speed,NULL, 0 );idxFound = true;break;)if( !idxFound )(vgNavigatorAddMarker( navigator,pointIdx,VGSPLINENAV_VELOCITY, speed,NULL, 0);)vgMakeSplineNavigator(navigator);if( render = VG_ON )vgProp( navigator, VGSPLINENAV_RENDER, VG_ON );if( navstate = VG_ON )vgProp( navigator, VGCOMMON_ENABLED, VG_ON

5、);)转帖分享怎样用程序在运动模式和运动路径之间进行转换代码下面两个函数分别用于让观察者在运动模式和运动路径之间进行转换：void switchObsToNavigator( const int navIdx ) 转为按指定的运动路径 navIdx(vgObserver *obs = vgGetObserv(0)vgNavigator *nav = (vgNavigator*) vgGetSplineNavigator( navIdx );vgProp( nav, VGCOMMON_ENABLED, VG_ON );vgProp( nav, VGPLYR_SPLINE_NAVIGATOR, V

6、G_ON );vgProp( obs, VGCOMMON_ENABLED, VG_ON );vgProp( obs, VGOBS_TETHERSTATE, VGOBS_FIXED );vgProp( obs, VGOBS_TETHERCOORD, VGOBS_TPLAYER );vgPlayer *plyr = vgGetPlyr(0);vgPlyrNav( plyr, nav );vgObservPlyr( obs, plyr );)void switchObsMotionModel( const int motIdx ) 转为按指定的运动模式 motIdx运动 (vgObserver *o

7、bs = vgGetObserv(0);vgObservNav( obs, NULL );vgObservPlyr( obs, NULL );vgNavigator *nav = (vgNavigator*) vgGetSplineNavigator(0);vgProp( nav, VGCOMMON_ENABLED, VG_OFF );vgProp( nav, VGPLYR_SPLINE_NAVIGATOR, VG_OFF );vgMotion *mot = vgGetMot(motIdx);vgProp( mot, VGCOMMON_ENABLED, VG_ON );vgUpdate( mo

8、t );vgObservMot( obs, mot );vgProp( obs, VGOBS_TETHERCOORD, VGOBS_TABSOLUTE);vgProp( obs, VGOBS_TETHERSTATE, VGOBS_DYNAMIC );vgProp( obs, VGCOMMON_ENABLED, VG_ON );)手动添加路径完整代码，但有一问题：自动漫游时不能到达路径末端，这是为何(内详，附代码)？在场景中手动添加控制点,形成路径,然后自动漫游,漫游时第一个控制点能够准确定位,但是漫游到路径的末端时，却总是停在最后一个控制点的稍前处，这是为何？有没有大侠知道啊？void mai

9、n()(vgWindow *win;vgObserver *obs;vgPath *path;vgSplineNavigator *nav;vgPosition *pos;int numPts, idx;vgInitSys();vgDefineSys(town.adf);vgConfigSys();win = vgGetWin(0);obs = vgGetObserv(0);path = vgNewPath(my.pth, NULL);nav = vgNewSplineNavigator(my.nav, path);numPts = 0;idx = 0;bool bDelFile = fals

10、e;while(1)(vgSyncFrame();vgFrame();switch(vgGetWinKey(win)(case VGWIN_F5:pos = vgNewPos();vgGetPos(obs, pos);vgPathAddCtrlPointPos(path, pos);vgDelPos(pos);numPts+;break;case VGWIN_F6:vgProp(nav, VGCOMMON_ENABLED, VG_ON);vgProp(nav, VGSPLINENAV_START_INDEX, 0);vgNavigatorAddMarker(nav, 0, VGSPLINENA

11、V_HERMITE, 0, NULL, 0);vgNavigatorAddMarker(nav, 0, VGSPLINENAV_START_DELAY 1, NULL, 0);/渲染导航路径for(idx = 1; idx numPts; idx+)vgNavigatorAddMarker(nav, idx, VGNAV_EMPTY, 0, NULL, 0);vgMakeSplineNavigator(nav);/按路径运动vgProp(obs, VGOBS_TETHERSTATE, VGOBS_NAVIGATOR);vgObservNav(obs, (vgNavigator*)nav);br

12、eak;default:break;)#include vg.h#include vgutil.h voidsetNavigatorOverallSpeed( const int navIdx,const float speed )(char data256;unsigned ctrlptIdx = -1;int eventType = -1;double value = -1;unsigned nbytes = 0;vgSplineNavigator *navigator = vgGetNavigator( navIdx );if( navigator = NULL )return;int

13、render = vgProp( navigator, VGSPLINENA/_RENDER );int navstate = vgProp( navigator, VGCOMMON_ENABLED );vgProp( navigator, VGSPLINENA/_RENDER, VG_OFF ); vgProp( navigator, VGCOMMON_ENABLED, VG_OFF );vgUpdate( navigator );int numMarkers = vgGetProp( navigator,VGNA/_NUM_MARKERS);for( int j = 0; j numMar

14、kers; j+ )(vgNavigatorGetMarker( (vgNavigator*)navigator,j, &ctrlptIdx, &eventType, &value, (void*)data, &nbytes );if( eventType = VGSPLINENA/_VELOCITY ) (vgNavigatorMarker( (vgNavigator*)navigator, j, ctrlptIdx, VGSPLINENAV_VELOCITY, speed, NULL, 0 );vgProp( navigator,VGSPLINENAV_VELOCITY, speed );

15、vgMakeSplineNavigator(navigator);if( render = VG_ON )vgProp( navigator, VGSPLINENA/_RENDER, VG_ON );if( navstate = VG_ON )vgProp( navigator, VGCOMMON_ENABLED, VG_ON );关于对player创建导航器得问题！牛人帮忙看看请问这一段对player创建导航器得代码有什么问题阿实现目标是在起始点和终点间直线运动void liftone(float x,float y,float z,float h,float p,float float x

16、1,float y1,float z1,float h1,float p1,float r1) (vgPath *path;vgSplineNavigator *nav;vgPosition *pos;vgPlayer *plyr;float ctrlPtsMAXNUM6;float old;int numPts,idx;plyr = vgFindPlyr(box2);path = vgNewPath(PATH_FILE,NULL);numPts=0;idx=0;pos=vgNewPos();vgPosVec(pos,x,y,z,h,p,r);vgPathAddCtrlPointPos(pat

17、h,pos);ctrlPtsnumPts0=x;ctrlPtsnumPts1=y;ctrlPtsnumPts2=z;ctrlPtsnumPts3=h;ctrlPtsnumPts4=p;ctrlPtsnumPts5=r;vgDelPos(pos);numPts+;pos=vgNewPos();vgPosVec(pos,x1,y1,z1,h1,p1,r1);vgPathAddCtrlPointPos(path,pos);ctrlPtsnumPts0=x1;ctrlPtsnumPts1=y1;ctrlPtsnumPts2=z1;ctrlPtsnumPts3=h1;ctrlPtsnumPts4=p1;

18、ctrlPtsnumPts5=r1;vgDelPos(pos);numPts+;if(numPts)(nav=vgNewSplineNavigator(NAV_FILE,path);vgProp(nav,VGCOMMON_ENABLED,VG_ON);vgProp(nav,VGSPLINENAV_START_INDEX,0);vgProp(nav,VGSPLINENAV_LOOPVG_ON);vgNavigatorAddMarker(nav,0,VGSPLINENAV_LINEAR,0,NULL,0);vgNavigatorAddMarker(nav,0,VGSPLINENAV_START_DELAY2,NULL,0);vgNavigatorAddMarker(nav,0,VGSPLINENAV_VELOCITY30,NULL,0);vgNavigatorAddMarker(nav,0,VGSPLINENAV_ABSOLUTE_HPR,VG_ON,NULL,0);vgNavigatorAddMarker(nav,0,VGSPLINENAV_RENDER,VG_ON,NULL,0);for(idx=1;idxNUMPTS;IDX+)(vgNavigatorAddMarker(nav,idx,VGNAV_EMPTY0,