These are all my code.Can you help me rewrite the code??I want to remove the
particle effects when the particle effects disappear.But now it does't work
fine.
Thank you!Good Lucky!
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osg/DeleteHandler>
#include <osg/Group>
#include <osg/Geode>
#include <osg/ShapeDrawable>
#include <osg/Texture2D>
#include <osg/PositionAttitudeTransform>
#include <osg/MatrixTransform>
#include <osg/io_utils>
#include <osgUtil/Optimizer>
#include <osgUtil/IntersectVisitor>
#include <osgDB/ReadFile>
#include <osgText/Text>
#include <osgParticle/ExplosionEffect>
#include <osgParticle/ExplosionDebrisEffect>
#include <osgParticle/SmokeEffect>
#include <osgParticle/SmokeTrailEffect>
#include <osgParticle/FireEffect>
#include "terrain_coords.h" //the file you can find in the example of
osghangglide.
osg::Vec3 wind(1.0f,0.0f,0.0f);
osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float
radius,double looptime)
{
osg::AnimationPath* animationPath = new osg::AnimationPath;
animationPath->setLoopMode(osg::AnimationPath::LOOP);
int numSamples = 40;
float yaw = 0.0f;
float yaw_delta = 2.0f*osg::PI/((float)numSamples-1.0f);
float roll = osg::inDegrees(30.0f);
double time=0.0f;
double time_delta = looptime/(double)numSamples;
for(int i=0;i<numSamples;++i)
{
osg::Vec3 position(center+osg::Vec3(sinf(yaw)*radius,cosf(yaw)*radius,0.0f));
osg::Quat
rotation(osg::Quat(roll,osg::Vec3(0.0,1.0,0.0))*osg::Quat(-(yaw+osg::inDegrees(90.0f)),osg::Vec3(0.0,0.0,1.0)));
animationPath->insert(time,osg::AnimationPath::ControlPoint(position,rotation));
yaw += yaw_delta;
time += time_delta;
}
return animationPath;
}
osg::Node* createMovingModel(const osg::Vec3& center, float radius)
{
float animationLength = 10.0f;
osg::AnimationPath* animationPath =
createAnimationPath(center,radius,animationLength);
osg::Group* model = new osg::Group;
osg::Node* glider = osgDB::readNodeFile("glider.osg");
if (glider)
{
const osg::BoundingSphere& bs = glider->getBound();
float size = radius/bs.radius()*0.15f;
osg::MatrixTransform* positioned = new osg::MatrixTransform;
positioned->setDataVariance(osg::Object::STATIC);
positioned->setMatrix(osg::Matrix::translate(-bs.center())*
osg::Matrix::scale(size,size,size)*
osg::Matrix::rotate(osg::inDegrees(-90.0f),0.0f,0.0f,1.0f));
positioned->addChild(glider);
osg::PositionAttitudeTransform* xform = new osg::PositionAttitudeTransform;
xform->setDataVariance(osg::Object::DYNAMIC);
xform->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
xform->setUpdateCallback(new
osg::AnimationPathCallback(animationPath,0.0,0.5));
xform->addChild(positioned);
model->addChild(xform);
}
osg::Node* cessna = osgDB::readNodeFile("cessna.osg");
if (cessna)
{
const osg::BoundingSphere& bs = cessna->getBound();
float size = radius/bs.radius()*0.15f;
osg::MatrixTransform* positioned = new osg::MatrixTransform;
positioned->getOrCreateStateSet()->setMode(GL_NORMALIZE,
osg::StateAttribute::ON);
positioned->setDataVariance(osg::Object::STATIC);
positioned->setMatrix(osg::Matrix::translate(-bs.center())*
osg::Matrix::scale(size,size,size)*
osg::Matrix::rotate(osg::inDegrees(180.0f),0.0f,0.0f,1.0f));
positioned->addChild(cessna);
osg::MatrixTransform* xform = new osg::MatrixTransform;
xform->setDataVariance(osg::Object::DYNAMIC);
xform->setUpdateCallback(new
osg::AnimationPathCallback(animationPath,0.0f,1.0));
xform->addChild(positioned);
model->addChild(xform);
}
return model;
}
osg::Vec3 computeTerrainIntersection(osg::Node* subgraph,float x,float y)
{
osgUtil::IntersectVisitor iv;
osg::ref_ptr<osg::LineSegment> segDown = new osg::LineSegment;
const osg::BoundingSphere& bs = subgraph->getBound();
float zMax = bs.center().z()+bs.radius();
float zMin = bs.center().z()-bs.radius();
segDown->set(osg::Vec3(x,y,zMin),osg::Vec3(x,y,zMax));
iv.addLineSegment(segDown.get());
subgraph->accept(iv);
if (iv.hits())
{
osgUtil::IntersectVisitor::HitList& hitList = iv.getHitList(segDown.get());
if (!hitList.empty())
{
osg::Vec3 ip = hitList.front().getWorldIntersectPoint();
return ip;
}
}
return osg::Vec3(x,y,0.0f);
}
void build_world(osg::Group *root)
{
osg::Geode* terrainGeode = new osg::Geode;
{
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
terrainGeode->setStateSet( stateset );
float size = 1000; // 10km;
float scale = size/39.0f; // 10km;
float z_scale = scale*3.0f;
osg::HeightField* grid = new osg::HeightField;
grid->allocate(38,39);
grid->setXInterval(scale);
grid->setYInterval(scale);
for(unsigned int r=0;r<39;++r)
{
for(unsigned int c=0;c<38;++c)
{
grid->setHeight(c,r,z_scale*vertex[r+c*39][2]);
}
}
terrainGeode->addDrawable(new osg::ShapeDrawable(grid));
root->addChild(terrainGeode);
}
osg::ref_ptr<osg::Group> node1 = new osg::Group() ;
// create particle effects
{
osg::Vec3 position = computeTerrainIntersection(terrainGeode,100.0f,100.0f);
osg::ref_ptr<osgParticle::ExplosionEffect> explosion = new
osgParticle::ExplosionEffect(position, 10.0f);
osg::ref_ptr<osgParticle::ExplosionDebrisEffect> explosionDebri = new
osgParticle::ExplosionDebrisEffect(position, 10.0f);
osg::ref_ptr<osgParticle::SmokeEffect> smoke = new
osgParticle::SmokeEffect(position, 10.0f);
osg::ref_ptr<osgParticle::FireEffect> fire = new
osgParticle::FireEffect(position, 10.0f);
explosion->setWind(wind);
explosionDebri->setWind(wind);
smoke->setWind(wind);
fire->setWind(wind);
root->addChild(explosion.get());
root->addChild(explosionDebri.get());
root->addChild(smoke.get());
root->addChild(fire.get());
}
// create particle effects
{
osg::Vec3 position = computeTerrainIntersection(terrainGeode,200.0f,100.0f);
osgParticle::ExplosionEffect* explosion = new
osgParticle::ExplosionEffect(position, 1.0f);
osgParticle::ExplosionDebrisEffect* explosionDebri = new
osgParticle::ExplosionDebrisEffect(position, 1.0f);
osgParticle::SmokeEffect* smoke = new osgParticle::SmokeEffect(position,
1.0f);
osgParticle::FireEffect* fire = new osgParticle::FireEffect(position, 1.0f);
explosion->setWind(wind);
explosionDebri->setWind(wind);
smoke->setWind(wind);
fire->setWind(wind);
root->addChild(explosion);
root->addChild(explosionDebri);
root->addChild(smoke);
root->addChild(fire);
}
{
root->addChild(createMovingModel(osg::Vec3(500.0f,500.0f,500.0f),300.0f));
}
}
//PICK
class PickHandler : public osgGA::GUIEventHandler {
public:
PickHandler() {}
bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
{
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::PUSH):
{
osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
pick(viewer,ea);
}
return false;
default:
return false;
}
}
void pick(osgViewer::Viewer* viewer, const osgGA::GUIEventAdapter& ea)
{
osg::Group* root = dynamic_cast<osg::Group*>(viewer->getSceneData());
if (!root) return;
osgUtil::LineSegmentIntersector::Intersections intersections;
if (viewer->computeIntersections(ea.getX(),ea.getY(),intersections))
{
const osgUtil::LineSegmentIntersector::Intersection& hit =
*intersections.begin();
bool handleMovingModels = false;
const osg::NodePath& nodePath = hit.nodePath;
for(osg::NodePath::const_iterator nitr=nodePath.begin();
nitr!=nodePath.end();
++nitr)
{
const osg::Transform* transform = dynamic_cast<const
osg::Transform*>(*nitr);
if (transform)
{
if (transform->getDataVariance()==osg::Object::DYNAMIC)
handleMovingModels=true;
}
}
osg::Vec3 position = handleMovingModels ? hit.getLocalIntersectPoint() :
hit.getWorldIntersectPoint();
float scale = 10.0f * ((float)rand() / (float)RAND_MAX);
float intensity = 1.0f;
osgParticle::ExplosionEffect* explosion = new
osgParticle::ExplosionEffect(position, scale, intensity);
osgParticle::ExplosionDebrisEffect* explosionDebri = new
osgParticle::ExplosionDebrisEffect(position, scale, intensity);
osgParticle::FireEffect* fire = new osgParticle::FireEffect(position, scale,
intensity);
osgParticle::ParticleEffect* smoke = 0;
if (handleMovingModels)
smoke = new osgParticle::SmokeTrailEffect(position, scale, intensity);
else
smoke = new osgParticle::SmokeEffect(position, scale, intensity);
explosion->setWind(wind);
explosionDebri->setWind(wind);
smoke->setWind(wind);
fire->setWind(wind);
osg::Group* effectsGroup = new osg::Group;
effectsGroup->addChild(explosion);
effectsGroup->addChild(explosionDebri);
effectsGroup->addChild(smoke);
effectsGroup->addChild(fire);
if (handleMovingModels)
{
// insert particle effects alongside the hit node, therefore able to track
that nodes movement,
// however, this does require us to insert the ParticleSystem itself into
the root of the scene graph
// seperately from the the main particle effects group which contains the
emitters and programs.
// the follow code block implements this, note the path for handling
particle effects which arn't attached to
// moving models is easy - just a single line of code!
// tell the effects not to attach to the particle system locally for
rendering, as we'll handle add it into the
// scene graph ourselves.
explosion->setUseLocalParticleSystem(false);
explosionDebri->setUseLocalParticleSystem(false);
smoke->setUseLocalParticleSystem(false);
fire->setUseLocalParticleSystem(false);
// find a place to insert the particle effects group alongside the hit node.
// there are two possible ways that this can be done, either insert it into
// a pre-existing group along side the hit node, or if no pre existing group
// is found then this needs to be inserted above the hit node, and then the
// particle effect can be inserted into this.
osg::ref_ptr<osg::Node> hitNode = hit.nodePath.back();
osg::Node::ParentList parents = hitNode->getParents();
osg::Group* insertGroup = 0;
unsigned int numGroupsFound = 0;
for(osg::Node::ParentList::iterator itr=parents.begin();
itr!=parents.end();
++itr)
{
if (typeid(*(*itr))==typeid(osg::Group))
{
++numGroupsFound;
insertGroup = *itr;
}
}
if (numGroupsFound==parents.size() && numGroupsFound==1 && insertGroup)
{
osg::notify(osg::INFO)<<"PickHandler::pick(,) hit node's parent is a
single osg::Group so we can simple the insert the particle effects group
here."<<std::endl;
// just reuse the existing group.
insertGroup->addChild(effectsGroup);
}
else
{
osg::notify(osg::INFO)<<"PickHandler::pick(,) hit node doesn't have an
appropriate osg::Group node to insert particle effects into, inserting a new
osg::Group."<<std::endl;
insertGroup = new osg::Group;
for(osg::Node::ParentList::iterator itr=parents.begin();
itr!=parents.end();
++itr)
{
(*itr)->replaceChild(hit.nodePath.back(),insertGroup);
}
insertGroup->addChild(hitNode.get());
insertGroup->addChild(effectsGroup);
}
// finally insert the particle systems into a Geode and attach to the root
of the scene graph so the particle system
// can be rendered.
osg::Geode* geode = new osg::Geode;
geode->addDrawable(explosion->getParticleSystem());
geode->addDrawable(explosionDebri->getParticleSystem());
geode->addDrawable(smoke->getParticleSystem());
geode->addDrawable(fire->getParticleSystem());
root->addChild(geode);
}
else
{
// when we don't have moving models we can simple insert the particle
effect into the root of the scene graph
osg::notify(osg::INFO)<<"PickHandler::pick(,) adding particle effects to
root node."<<std::endl;
root->addChild(effectsGroup);
}
#if 0
osg::Geode* geode = new osg::Geode;
geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(position,scale)));
group->addChild(geode);
#endif
}
}
protected:
virtual ~PickHandler() {}
};
// function used in debugging
//插入粒子效果
void insertParticle(osg::Group* root, const osg::Vec3& center, float radius)
{
bool handleMovingModels = false;
osg::Vec3 position = center +
osg::Vec3( radius * (((float)rand() / (float)RAND_MAX)-0.5)*2.0,
radius * (((float)rand() / (float)RAND_MAX)-0.5)*2.0,
0.0f);
float scale = 10.0f * ((float)rand() / (float)RAND_MAX);
float intensity = 1.0f;
osgParticle::ExplosionEffect* explosion = new
osgParticle::ExplosionEffect(position, scale, intensity);
osgParticle::ExplosionDebrisEffect* explosionDebri = new
osgParticle::ExplosionDebrisEffect(position, scale, intensity);
osgParticle::FireEffect* fire = new osgParticle::FireEffect(position, scale,
intensity);
osgParticle::ParticleEffect* smoke = 0;
if (handleMovingModels)
smoke = new osgParticle::SmokeTrailEffect(position, scale, intensity);
else
smoke = new osgParticle::SmokeEffect(position, scale, intensity);
explosion->setWind(wind);
explosionDebri->setWind(wind);
smoke->setWind(wind);
fire->setWind(wind);
osg::Group* effectsGroup = new osg::Group;
effectsGroup->addChild(explosion);
effectsGroup->addChild(explosionDebri);
effectsGroup->addChild(smoke);
effectsGroup->addChild(fire);
root->addChild(effectsGroup);
}
class PHandler : public osgGA::GUIEventHandler {
public:
PHandler() {}
bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
{
osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
osg::Group* group = dynamic_cast<osg::Group*>(viewer->getSceneData()) ;
group->setDataVariance(osg::Object::DYNAMIC) ;
osgParticle::ExplosionEffect* ee
=dynamic_cast<osgParticle::ExplosionEffect*>(group->getChild(1)) ;
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::PUSH):
{
if(ee->areAllParticlesDead())
{
group->removeChild(1) ;
}
}
return false;
default:
return false;
}
}
};
int main(int, char **)
{
osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
viewer->addEventHandler(new PickHandler());
viewer->addEventHandler(new PHandler());
osg::ref_ptr<osg::Group> root = new osg::Group();
build_world(root.get());
//osgUtil::Optimizer optimizer;
//optimizer.optimize(root.get());
viewer->setSceneData(root.get());
viewer->run();
return 0 ;
}
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