关于在osgEarth上创建粒子效果不正常问题

心灬魔

我在osg中做了一个喷泉效果，如图1，状态正常，当我在地球表面获得一个世界坐标以后（坐标值：osg::Vec3d(-1460944.73106, 5518487.81601, 2839320.897);）出现了如图2的失真现象，希望各位大神帮帮忙，代码：

1. 
   
2. osg::Vec3d worldPos = osg::Vec3d(-1460944.73106, 5518487.81601, 2839320.897);
   
3.         osg::Vec3d offset = worldPos;
   
4.         offset.normalize();
   
5.         worldPos += offset*20;
   
6.         osg::Vec3d spherePos = osg::Vec3d(-1460948.82485, 5518482.83934, 2839320.358);
   
7.         osg::Group* fountainNode = new osg::Group;
   
8.         osg::ref_ptr<osgParticle::ParticleSystem> parSystem = new osgParticle::ParticleSystem;
   
9.         parSystem->setDefaultAttributesUsingShaders("Images/smoke.rgb", true, 0);
   
10.         parSystem->getDefaultParticleTemplate().setLifeTime(5.0f);
    
11.         parSystem->getDefaultParticleTemplate().setShape(osgParticle::Particle::POINT);
    
12.         parSystem->setVisibilityDistance(-1.0f);
    
13.         osg::StateSet* stateset = parSystem->getOrCreateStateSet();
    
14.         stateset->setAttribute(new osg::Point(3));
    
15.         stateset->setTextureAttributeAndModes(0, new osg::PointSprite, osg::StateAttribute::ON);
    
16. 
    
17.         osg::ref_ptr<osgParticle::RandomRateCounter> counter = new osgParticle::RandomRateCounter;
    
18.         counter->setRateRange(15000, 20000);
    
19.        
    
20.         //重力模拟对象;
    
21.         osg::ref_ptr<osgParticle::AccelOperator> accelOperator = new osgParticle::AccelOperator();
    
22.         osg::Vec3d asoff = offset*-50;
    
23.         accelOperator->setAcceleration(asoff);
    
24. 
    
25.         //阻尼运动模拟;
    
26.         osg::ref_ptr<osgParticle::DampingOperator> dampingOperator = new osgParticle::DampingOperator;
    
27.         dampingOperator->setDamping(0.9f);
    
28. 
    
29.         //跳跃模拟;
    
30.         osg::ref_ptr<osgParticle::BounceOperator> bounceOperator = new osgParticle::BounceOperator;
    
31.         bounceOperator->setFriction(-0.05);
    
32.         bounceOperator->setResilience(0.35);
    
33.         bounceOperator->addDiskDomain(worldPos-offset*2, offset, 6.0);
    
34.         //bounceOperator->addPlaneDomain(osg::Plane(worldPos, 6.0));
    
35. 
    
36.         //水槽模拟;
    
37.         osg::ref_ptr<osgParticle::SinkOperator> sinkOperator = new osgParticle::SinkOperator;
    
38.         sinkOperator->setSinkStrategy(osgParticle::SinkOperator::SINK_OUTSIDE);
    
39.         sinkOperator->addSphereDomain(worldPos, 5.5);
    
40. 
    
41.         //标准编程对象模块;
    
42.         osg::ref_ptr<osgParticle::ModularProgram> program = new osgParticle::ModularProgram;
    
43.         program->setParticleSystem(parSystem);
    
44.         program->addOperator(accelOperator);
    
45.         program->addOperator(dampingOperator);
    
46.         //program->addOperator(bounceOperator);
    
47.         program->addOperator(sinkOperator);
    
48. 
    
49.         osg::ref_ptr<osgParticle::SectorPlacer> placer = new osgParticle::SectorPlacer;
    
50.         placer->setCenter(worldPos);
    
51. 
    
52.         osg::ref_ptr<osgParticle::RadialShooter> shooter = NULL;
    
53.        
    
54.         //发射器模块;
    
55.         osg::ref_ptr<osgParticle::ModularEmitter> emitter = new osgParticle::ModularEmitter;
    
56.         emitter->setParticleSystem(parSystem);
    
57.         emitter->setCounter(counter);
    
58.         emitter->setPlacer(placer);
    
59.         shooter = dynamic_cast<osgParticle::RadialShooter*>(emitter->getShooter());
    
60.         shooter->setPhiRange(0, osg::PI);
    
61.         shooter->setThetaRange(0, osg::PI*2);
    
62.         shooter->setInitialSpeedRange(5, 10);
    
63.         if (shooter)
    
64.         {
    
65.                 osgParticle::rangef phiRange = shooter->getPhiRange();
    
66.                 osgParticle::rangef theRange = shooter->getThetaRange();
    
67.         }
    
68.         osg::ref_ptr<osg::Geode> geode = new osg::Geode;
    
69.         geode->addDrawable(parSystem);
    
70.         osg::ref_ptr<osgParticle::ParticleSystemUpdater> parUpdater = new osgParticle::ParticleSystemUpdater;
    
71.         parUpdater->addParticleSystem(parSystem);
    
72.         fountainNode->addChild(emitter.get());
    
73.         fountainNode->addChild(program.get());
    
74.         fountainNode->addChild(geode);
    
75.         fountainNode->addChild(parUpdater);
    

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