FGFS-4.1/OpenSceneGraph
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Added support for rapid movement of the emitter, with particle now seeding between

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the position of the emitter in the previous frame and the new position in the new
frame, the number of particles added also scales up to compensate for this movement.
This commit is contained in:
Robert Osfield
2005-08-25 14:12:08 +00:00
parent 320d0f67e4
commit be285c62c0
14 changed files with 183 additions and 28 deletions
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70
src/osgParticle/ModularEmitter.cpp
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@@ -1,16 +1,19 @@
#include <osgParticle/ModularEmitter>
#include <osgParticle/Emitter>
#include <osg/Notify>
osgParticle::ModularEmitter::ModularEmitter()
: Emitter(),
_numParticleToCreateMovementCompensationRatio(0.0f),
_counter(new RandomRateCounter),
_placer(new PointPlacer),
_shooter(new RadialShooter)
{
}
osgParticle::ModularEmitter::ModularEmitter(const ModularEmitter& copy, const osg::CopyOp& copyop)
: Emitter(copy, copyop),
osgParticle::ModularEmitter::ModularEmitter(const ModularEmitter& copy, const osg::CopyOp& copyop):
Emitter(copy, copyop),
_numParticleToCreateMovementCompensationRatio(copy._numParticleToCreateMovementCompensationRatio),
_counter(static_cast<Counter *>(copyop(copy._counter.get()))),
_placer(static_cast<Placer *>(copyop(copy._placer.get()))),
_shooter(static_cast<Shooter *>(copyop(copy._shooter.get())))
@@ -19,14 +22,61 @@ osgParticle::ModularEmitter::ModularEmitter(const ModularEmitter& copy, const os
void osgParticle::ModularEmitter::emit(double dt)
{
int n = _counter->numParticlesToCreate(dt);
for (int i=0; i<n; ++i) {
Particle* P = getParticleSystem()->createParticle(getUseDefaultTemplate()? 0: &getParticleTemplate());
if (P) {
_placer->place(P);
_shooter->shoot(P);
if (getReferenceFrame() == RELATIVE_RF) {
P->transformPositionVelocity(getLocalToWorldMatrix());
if (getReferenceFrame() == RELATIVE_RF)
{
const osg::Matrix& ltw = getLocalToWorldMatrix();
const osg::Matrix& previous_ltw = getPreviousLocalToWorldMatrix();
int n = _counter->numParticlesToCreate(dt);
if (_numParticleToCreateMovementCompensationRatio>0.0f)
{
// compute the distance moved between frames
const osg::Vec3 controlPosition = _placer->getControlPosition();
osg::Vec3 previousPosition = controlPosition * previous_ltw;
osg::Vec3 currentPosition = controlPosition * ltw;
float distance = (currentPosition-previousPosition).length();
float size = getUseDefaultTemplate() ?
getParticleSystem()->getDefaultParticleTemplate().getSizeRange().minimum :
getParticleTemplate().getSizeRange().minimum;
float num_extra_samples = _numParticleToCreateMovementCompensationRatio*distance/size;
float rounded_down = floor(num_extra_samples);
float remainder = num_extra_samples-rounded_down;
n = osg::maximum(n, int(rounded_down) + (((float) rand() < remainder * (float)RAND_MAX) ? 1 : 0));
}
for (int i=0; i<n; ++i)
{
Particle* P = getParticleSystem()->createParticle(getUseDefaultTemplate()? 0: &getParticleTemplate());
if (P)
{
_placer->place(P);
_shooter->shoot(P);
// now need to transform the position and velocity because we having a moving model.
float r = ((float)rand()/(float)RAND_MAX);
P->transformPositionVelocity(ltw, previous_ltw, r);
//P->transformPositionVelocity(ltw);
}
else
{
osg::notify(osg::NOTICE)<<"run out of particle"<<std::endl;
}
}
}
else
{
int n = _counter->numParticlesToCreate(dt);
for (int i=0; i<n; ++i)
{
Particle* P = getParticleSystem()->createParticle(getUseDefaultTemplate()? 0: &getParticleTemplate());
if (P)
{
_placer->place(P);
_shooter->shoot(P);
}
}
}