Hi,
Finally i have made the groundwork of my rocket animation, i used a spehere
until i find a rocket model :D and still, there is something that didnt get
clear!
Note: some codes below are taken from the osgparticleeffects example.
Code:
osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float
radius,double looptime)
{
// set up the animation path
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;
}
int main(int argc, char *argv[])
{
osgViewer::Viewer viewer;
osg::Group * root = new osg::Group;
osg::Geode *rocketModel = new osg::Geode;
osg::Sphere *rocket = new osg::Sphere;
/////////////////////////////////CREATE
SPHERE//////////////////////////////////////////////////
// rocket->setCenter(osg::Vec3f(0,0,0));
rocket->setRadius(1.1f);
osg::ShapeDrawable* rocketDrawable = new osg::ShapeDrawable(rocket);
rocketModel->addDrawable(rocketDrawable);
//////////////////////////////////ANIMATION
LOOP//////////////////////////////////////////////
float animationLength = 10.0f;
float radius = 10;
osg::Vec3f center(0,0,0);
osg::AnimationPath* animationPath =
createAnimationPath(center,radius,animationLength);
const osg::BoundingSphere& bs = rocketModel->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));
osg::PositionAttitudeTransform* rocketPath = new
osg::PositionAttitudeTransform;
rocketPath->setDataVariance(osg::Object::DYNAMIC);
rocketPath->getOrCreateStateSet()->setMode(GL_NORMALIZE,
osg::StateAttribute::ON);
rocketPath->setUpdateCallback(new
osg::AnimationPathCallback(animationPath,0.0,0.5));
/////////////////////////////////SMOKE
TRAIL////////////////////////////////////////////////////
osg::Vec3 position = rocket->getCenter()+
osg::Vec3f(rocket->getRadius()/2,rocket->getRadius()/2,rocket->getRadius()/2);
float scale = 1000.0f * ((float)rand() / (float)RAND_MAX);
float intensity = 11.0f;
osgParticle::FireEffect* fire = new osgParticle::FireEffect(position,
scale, intensity);
osgParticle::ParticleEffect* smoke = new
osgParticle::SmokeTrailEffect(position, scale, intensity);
smoke->setUseLocalParticleSystem(false);
fire->setUseLocalParticleSystem(false);
/////////////////////////////FINAL//////////////////////////////////////////////////////////////
rocketModel->addDrawable(fire->getParticleSystem());
rocketModel->addDrawable(smoke->getParticleSystem());
positioned->addChild(rocketModel);
rocketPath->addChild(positioned);
rocketPath->addChild(fire);
rocketPath->addChild(smoke);
root->addChild(rocketPath);
viewer.setSceneData(root);
return viewer.run();
}
there is no problem with this, the fire and smoke effect follows the surface of
sphere growing up direction.
[Image: http://forum.openscenegraph.org/files/untitled_185.png ]
here is my questions:
1) if i take the line
Code:
rocketModel->addDrawable(rocketDrawable);
under the final section the fire and smoke trail effect's direction changes to
down. is this a bug from osg?
2) why we had to add fire and smoke effects twice? shouldnt it enough to add
these particle systems to rocket model and see "vuola! it moves with it!"? (i
achieved to goal after several tries)
3) i also tried to wind these effects like in the example, i setwind with
osg::Vec3 combinations but didn't work.?
4) i see very bad smoke effect unlike the example, i've tired optimiesed but
didnt work.
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=45565#45565
Attachments:
http://forum.openscenegraph.org//files/untitled_455.png
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