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Added SmokeTrailEffect which renders created particles as single quad or line

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strip, in the case of the quad strip the strip is aligned to the be orthogonal with
the eye point.
This commit is contained in:
Robert Osfield 2005-10-12 18:42:36 +00:00
parent 540e676dae
commit 1e508d432b
16 changed files with 611 additions and 73 deletions
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12
VisualStudio/osgParticle/osgParticle.dsp
View File

@ -163,6 +163,10 @@ SOURCE=..\..\src\osgParticle\SmokeEffect.cpp
# End Source File
# Begin Source File
SOURCE=..\..\src\osgParticle\SmokeTrailEffect.cpp
# End Source File
# Begin Source File
SOURCE=..\..\src\osgParticle\Version.cpp
# End Source File
# End Group
@ -187,6 +191,10 @@ SOURCE=..\..\include\osgParticle\Counter
# End Source File
# Begin Source File
SOURCE=..\..\include\osgParticle\ConstantRateCounter
# End Source File
# Begin Source File
SOURCE=..\..\include\osgParticle\Emitter
# End Source File
# Begin Source File
@ -307,6 +315,10 @@ SOURCE=..\..\include\osgParticle\SmokeEffect
# End Source File
# Begin Source File
SOURCE=..\..\include\osgParticle\SmokeTrailEffect
# End Source File
# Begin Source File
SOURCE=..\..\include\osgParticle\VariableRateCounter
# End Source File
# Begin Source File

7
examples/osgparticleeffects/osgparticleeffects.cpp
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@ -16,6 +16,7 @@
#include <osgParticle/ExplosionEffect>
#include <osgParticle/ExplosionDebrisEffect>
#include <osgParticle/SmokeEffect>
#include <osgParticle/SmokeTrailEffect>
#include <osgParticle/FireEffect>
// for the grid data..
@ -276,8 +277,12 @@ public:
osgParticle::ExplosionEffect* explosion = new osgParticle::ExplosionEffect(position, scale, intensity);
osgParticle::ExplosionDebrisEffect* explosionDebri = new osgParticle::ExplosionDebrisEffect(position, scale, intensity);
osgParticle::ParticleEffect* smoke = new osgParticle::SmokeEffect(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);

5
include/osg/CullingSet
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@ -16,7 +16,7 @@
#include <osg/Polytope>
#include <osg/ShadowVolumeOccluder>
#include <osg/Referenced>
#include <osg/Viewport>
#include <math.h>
@ -328,8 +328,11 @@ class OSG_EXPORT CullingSet : public Referenced
void popOccludersCurrentMask(NodePath& nodePath);
static osg::Vec4 computePixelSizeVector(const Viewport& W, const Matrix& P, const Matrix& M);
virtual ~CullingSet();
protected:

12
include/osgParticle/ConnectedParticleSystem
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@ -35,12 +35,10 @@ namespace osgParticle
/// Create a new particle from the specified template (or the default one if <CODE>ptemplate</CODE> is null).
virtual Particle* createParticle(const Particle* ptemplate);
/// Destroy the i-th particle.
virtual void destroyParticle(int i);
/// Update the particles. Don't call this directly, use a <CODE>ConnectedParticleSystemUpdater</CODE> instead.
virtual void update(double dt);
/// Reuse the i-th particle.
virtual void reuseParticle(int i);
/// Draw the connected particles as either a line or a quad strip, depending upon viewing distance. .
virtual void drawImplementation(osg::State& state) const;
protected:
@ -49,8 +47,8 @@ namespace osgParticle
ConnectedParticleSystem& operator=(const ConnectedParticleSystem&) { return *this; }
Particle* _startParticle;
Particle* _lastParticleCreated;
int _startParticle;
int _lastParticleCreated;
};
}

75
include/osgParticle/ConstantRateCounter Normal file
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@ -0,0 +1,75 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGPARTICLE_CONSTANTRATECOUNTER
#define OSGPARTICLE_CONSTANTRATECOUNTER 1
#include <osgParticle/Counter>
#include <osg/Object>
#include <osg/Math>
namespace osgParticle
{
class ConstantRateCounter: public Counter {
public:
ConstantRateCounter():
Counter(),
_minimumNumberOfParticlesToCreate(0),
_numberOfParticlesPerSecondToCreate(0)
{
}
ConstantRateCounter(const ConstantRateCounter& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY):
Counter(copy, copyop),
_minimumNumberOfParticlesToCreate(copy._minimumNumberOfParticlesToCreate),
_numberOfParticlesPerSecondToCreate(copy._numberOfParticlesPerSecondToCreate)
{
}
META_Object(osgParticle, ConstantRateCounter);
void setMinimumNumberOfParticlesToCreate(int minNumToCreate) { _minimumNumberOfParticlesToCreate = minNumToCreate; }
int getMinimumNumberOfParticlesToCreate() const { return _minimumNumberOfParticlesToCreate; }
void setNumberOfParticlesPerSecondToCreate(double numPerSecond) { _numberOfParticlesPerSecondToCreate = numPerSecond; }
double getNumberOfParticlesPerSecondToCreate() const { return _numberOfParticlesPerSecondToCreate; }
/// Return the number of particles to be created in this frame
virtual int numParticlesToCreate(double dt) const
{
double v = (dt*_numberOfParticlesPerSecondToCreate);
int i = (int)(v);
_carryOver += (v-(double)i);
if (_carryOver>1.0)
{
++i;
_carryOver -= 1.0;
}
return osg::maximum(_minimumNumberOfParticlesToCreate, i);
}
protected:
virtual ~ConstantRateCounter() {}
int _minimumNumberOfParticlesToCreate;
double _numberOfParticlesPerSecondToCreate;
mutable double _carryOver;
};
}
#endif

44
include/osgParticle/Particle
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@ -28,6 +28,9 @@
namespace osgParticle
{
// forward declare so we can reference it
class ParticleSystem;
/** Implementation of a <B>particle</B>.
Objects of this class are particles, they have some graphical properties
and some physical properties. Particles are created by emitters and then placed
@ -45,6 +48,11 @@ namespace osgParticle
class OSGPARTICLE_EXPORT Particle {
public:
enum
{
INVALID_INDEX = -1
};
/**
Shape of particles.
NOTE: the LINE shape should be used in conjunction with FIXED alignment mode (see ParticleSystem).
@ -126,6 +134,18 @@ namespace osgParticle
/// Get the previous angle vector.
inline const osg::Vec3& getPreviousAngle() const;
/// Get the current color
inline const osg::Vec4& getCurrentColor() const { return _current_color; }
/// Get the current alpha
inline float getCurrentAlpha() const { return _current_alpha; }
/// Get the s texture coordinate of the bottom left of the particle
inline const float getSTexCoord() const { return _s_coord; }
/// Get the t texture coordinate of the bottom left of the particle
inline float getTCoord() const { return _t_coord; }
/** Kill the particle on next update
NOTE: after calling this function, the <CODE>isAlive()</CODE> method will still
return true until the particle is updated again.
@ -216,10 +236,26 @@ namespace osgParticle
/// Get the current (interpolated) polygon size. Valid only after the first call to update().
inline float getCurrentSize() const;
// Specify how the particle texture is tiled
/// Specify how the particle texture is tiled
inline void setTextureTile(int sTile, int tTile, int numTiles = 0);
private:
/// Set the previous particle
inline void setPreviousParticle(int previous) { _previousParticle = previous; }
/// Get the previous particle
inline int getPreviousParticle() const { return _previousParticle; }
/// Set the next particle
inline void setNextParticle(int next) { _nextParticle = next; }
/// Get the const next particle
inline int getNextParticle() const { return _nextParticle; }
/// Method for initializing a particles texture coords as part of a connected particle system.
void setUpTexCoordsAsPartOfConnectedParticleSystem(ParticleSystem* ps);
protected:
Shape _shape;
rangef _sr;
@ -259,8 +295,8 @@ namespace osgParticle
float _t_coord;
// previous and next Particles are only used in ConnectedParticleSystems
Particle* _previousParticle;
Particle* _nextParticle;
int _previousParticle;
int _nextParticle;
};
// INLINE FUNCTIONS

4
include/osgParticle/ParticleSystem
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@ -123,6 +123,9 @@ namespace osgParticle
/// Destroy the i-th particle.
inline virtual void destroyParticle(int i);
/// Reuse the i-th particle.
inline virtual void reuseParticle(int i) { _deadparts.push(&(_particles[i])); }
/// Get the last frame number.
inline int getLastFrameNumber() const;
@ -170,7 +173,6 @@ namespace osgParticle
inline void update_bounds(const osg::Vec3& p, float r);
void single_pass_render(osg::State& state, const osg::Matrix& modelview) const;
private:
typedef std::vector<Particle> Particle_vector;
typedef std::stack<Particle*> Death_stack;

52
include/osgParticle/SmokeTrailEffect Normal file
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@ -0,0 +1,52 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGPARTICLE_SMOKETRAILEFFECT
#define OSGPARTICLE_SMOKETRAILEFFECT
#include <osgParticle/ParticleEffect>
#include <osgParticle/ModularEmitter>
#include <osgParticle/FluidProgram>
namespace osgParticle
{
class OSGPARTICLE_EXPORT SmokeTrailEffect : public ParticleEffect
{
public:
SmokeTrailEffect(const osg::Vec3& position=osg::Vec3(0.0f,0.0f,0.0f), float scale=1.0f, float intensity=1.0f);
SmokeTrailEffect(const SmokeTrailEffect& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
META_Node(osgParticle,SmokeTrailEffect);
virtual void setDefaults();
virtual void setUpEmitterAndProgram();
virtual Emitter* getEmitter() { return _emitter.get(); }
virtual const Emitter* getEmitter() const { return _emitter.get(); }
virtual Program* getProgram() { return _program.get(); }
virtual const Program* getProgram() const { return _program.get(); }
protected:
osg::ref_ptr<ModularEmitter> _emitter;
osg::ref_ptr<FluidProgram> _program;
};
}
#endif

31
src/osg/CullStack.cpp
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@ -80,36 +80,7 @@ void CullStack::pushCullingSet()
const osg::Matrix& P = *_projectionStack.back();
const osg::Matrix& M = *_modelviewStack.back();
// pre adjust P00,P20,P23,P33 by multiplying them by the viewport window matrix.
// here we do it in short hand with the knowledge of how the window matrix is formed
// note P23,P33 are multiplied by an implicit 1 which would come from the window matrix.
// Robert Osfield, June 2002.
// scaling for horizontal pixels
float P00 = P(0,0)*W.width()*0.5f;
float P20_00 = P(2,0)*W.width()*0.5f + P(2,3)*W.width()*0.5f;
osg::Vec3 scale_00(M(0,0)*P00 + M(0,2)*P20_00,
M(1,0)*P00 + M(1,2)*P20_00,
M(2,0)*P00 + M(2,2)*P20_00);
// scaling for vertical pixels
float P10 = P(1,1)*W.height()*0.5f;
float P20_10 = P(2,1)*W.height()*0.5f + P(2,3)*W.height()*0.5f;
osg::Vec3 scale_10(M(0,1)*P10 + M(0,2)*P20_10,
M(1,1)*P10 + M(1,2)*P20_10,
M(2,1)*P10 + M(2,2)*P20_10);
float P23 = P(2,3);
float P33 = P(3,3);
osg::Vec4 pixelSizeVector(M(0,2)*P23,
M(1,2)*P23,
M(2,2)*P23,
M(3,2)*P23 + M(3,3)*P33);
float scaleRatio = 0.7071067811f/sqrtf(scale_00.length2()+scale_10.length2());
pixelSizeVector *= scaleRatio;
osg::Vec4 pixelSizeVector = CullingSet::computePixelSizeVector(W,P,M);
if (_index_modelviewCullingStack>=_modelviewCullingStack.size())
{

34
src/osg/CullingSet.cpp
View File

@ -63,3 +63,37 @@ void CullingSet::popOccludersCurrentMask(NodePath& nodePath)
}
}
}
osg::Vec4 CullingSet::computePixelSizeVector(const Viewport& W, const Matrix& P, const Matrix& M)
{
// pre adjust P00,P20,P23,P33 by multiplying them by the viewport window matrix.
// here we do it in short hand with the knowledge of how the window matrix is formed
// note P23,P33 are multiplied by an implicit 1 which would come from the window matrix.
// Robert Osfield, June 2002.
// scaling for horizontal pixels
float P00 = P(0,0)*W.width()*0.5f;
float P20_00 = P(2,0)*W.width()*0.5f + P(2,3)*W.width()*0.5f;
osg::Vec3 scale_00(M(0,0)*P00 + M(0,2)*P20_00,
M(1,0)*P00 + M(1,2)*P20_00,
M(2,0)*P00 + M(2,2)*P20_00);
// scaling for vertical pixels
float P10 = P(1,1)*W.height()*0.5f;
float P20_10 = P(2,1)*W.height()*0.5f + P(2,3)*W.height()*0.5f;
osg::Vec3 scale_10(M(0,1)*P10 + M(0,2)*P20_10,
M(1,1)*P10 + M(1,2)*P20_10,
M(2,1)*P10 + M(2,2)*P20_10);
float P23 = P(2,3);
float P33 = P(3,3);
osg::Vec4 pixelSizeVector(M(0,2)*P23,
M(1,2)*P23,
M(2,2)*P23,
M(3,2)*P23 + M(3,3)*P33);
float scaleRatio = 0.7071067811f/sqrtf(scale_00.length2()+scale_10.length2());
pixelSizeVector *= scaleRatio;
return pixelSizeVector;
}

193
src/osgParticle/ConnectedParticleSystem.cpp
View File

@ -12,24 +12,23 @@
*/
#include <osg/Notify>
#include <osg/CullingSet>
#include <osg/io_utils>
#include <osgParticle/ConnectedParticleSystem>
using namespace osgParticle;
ConnectedParticleSystem::ConnectedParticleSystem():
_startParticle(0),
_lastParticleCreated(0)
_startParticle(Particle::INVALID_INDEX),
_lastParticleCreated(Particle::INVALID_INDEX)
{
}
ConnectedParticleSystem::ConnectedParticleSystem(const ConnectedParticleSystem& copy, const osg::CopyOp& copyop):
ParticleSystem(copy,copyop),
_startParticle(0),
_lastParticleCreated(0)
_startParticle(copy._startParticle),
_lastParticleCreated(copy._lastParticleCreated)
{
// need to think about how to copy _startParticle and _lastParticleCreated...
// should we just use indices? Should we compute offsets into the particle system?
osg::notify(osg::NOTICE)<<"Warning: ConnectedParticleSystem copy constructor incomplete."<<std::endl;
}
ConnectedParticleSystem::~ConnectedParticleSystem()
@ -38,20 +37,184 @@ ConnectedParticleSystem::~ConnectedParticleSystem()
Particle* ConnectedParticleSystem::createParticle(const Particle* ptemplate)
{
return ParticleSystem::createParticle(ptemplate);
// osg::notify(osg::NOTICE)<<this<< " Creating particle "<<std::endl;
Particle* particle = ParticleSystem::createParticle(ptemplate);
int particleIndex = (int)(particle - &_particles[0]);
if (particle)
{
if (_startParticle == Particle::INVALID_INDEX)
{
// we are the fisrt particle create, so start the connect particle list
_startParticle = particleIndex;
}
if (_lastParticleCreated != Particle::INVALID_INDEX)
{
// osg::notify(osg::NOTICE)<<this<< " Connecting "<<_lastParticleCreated<<" to "<<particleIndex<<std::endl;
// write up the last created particle to this new particle
_particles[_lastParticleCreated].setNextParticle(particleIndex);
particle->setPreviousParticle(_lastParticleCreated);
}
// set the new particle as the last particle created.
_lastParticleCreated = particleIndex;
}
return particle;
}
void ConnectedParticleSystem::destroyParticle(int i)
void ConnectedParticleSystem::reuseParticle(int particleIndex)
{
return ParticleSystem::destroyParticle(i);
}
// osg::notify(osg::NOTICE)<<this<< " Reusing particle "<<particleIndex<<std::endl;
void ConnectedParticleSystem::update(double dt)
{
ParticleSystem::update(dt);
if (particleIndex<0 || particleIndex>=(int)_particles.size()) return;
Particle* particle = &_particles[particleIndex];
int previous = particle->getPreviousParticle();
int next = particle->getNextParticle();
// update start and last entries
if (_startParticle == particleIndex)
{
_startParticle = particle->getNextParticle();
}
if (_lastParticleCreated == particleIndex)
{
_lastParticleCreated = Particle::INVALID_INDEX;
}
// join up the previous and next particles to account for
// the deletion of the this particle
if (previous != Particle::INVALID_INDEX)
{
_particles[previous].setNextParticle(next);
}
if (next != Particle::INVALID_INDEX)
{
_particles[next].setPreviousParticle(previous);
}
// reset the next and previous particle entries of this particle
particle->setPreviousParticle(Particle::INVALID_INDEX);
particle->setNextParticle(Particle::INVALID_INDEX);
// do the actual destroy of the particle
ParticleSystem::destroyParticle(particleIndex);
}
void ConnectedParticleSystem::drawImplementation(osg::State& state) const
{
ParticleSystem::drawImplementation(state);
const Particle* particle = (_startParticle != Particle::INVALID_INDEX) ? &_particles[_startParticle] : 0;
if (!particle) return;
osg::Vec4 pixelSizeVector = osg::CullingSet::computePixelSizeVector(*state.getCurrentViewport(),state.getProjectionMatrix(),state.getModelViewMatrix());
float unitPixelSize = fabs(1.0/(particle->getPosition()*pixelSizeVector));
float pixelSizeOfFirstParticle = unitPixelSize * particle->getCurrentSize();
float desiredGapBetweenDrawnParticles = 50.0f/unitPixelSize;
float desiredGapBetweenDrawnParticles2 = desiredGapBetweenDrawnParticles*desiredGapBetweenDrawnParticles;
unsigned int maxNumParticlesToSkip = 200;
float maxPixelError2 = osg::square(1.0f/unitPixelSize);
if (pixelSizeOfFirstParticle<1.0)
{
// draw the connected particles as a line
glBegin(GL_LINE_STRIP);
while(particle != 0)
{
const osg::Vec4& color = particle->getCurrentColor();
const osg::Vec3& pos = particle->getPosition();
glColor4f( color.r(), color.g(), color.b(), color.a() * particle->getCurrentAlpha());
glTexCoord2f( particle->getSTexCoord(), 0.5f );
glVertex3fv(pos.ptr());
const Particle* nextParticle = (particle->getNextParticle() != Particle::INVALID_INDEX) ? &_particles[particle->getNextParticle()] : 0;
if (nextParticle)
{
const osg::Vec3& nextPos = nextParticle->getPosition();
osg::Vec3 startDelta = nextPos-pos;
startDelta.normalize();
float distance2 = 0.0;
// now skip particles of required
for(unsigned int i=0;
i<maxNumParticlesToSkip && ((distance2<maxPixelError2) && (nextParticle->getNextParticle()!=Particle::INVALID_INDEX));
++i)
{
nextParticle = &_particles[nextParticle->getNextParticle()];
const osg::Vec3& nextPos = nextParticle->getPosition();
osg::Vec3 delta = nextPos-pos;
distance2 = (delta^startDelta).length2();
}
}
particle = nextParticle;
}
glEnd();
}
else
{
// draw the connected particles as a quad stripped aligned to be orthogonal to the eye
osg::Matrix eyeToLocalTransform;
eyeToLocalTransform.invert(state.getModelViewMatrix());
osg::Vec3 eyeLocal = osg::Vec3(0.0f,0.0,0.0f)*eyeToLocalTransform;
osg::Vec3 delta(0.0f,0.0f,1.0f);
glBegin(GL_QUAD_STRIP);
while(particle != 0)
{
const osg::Vec4& color = particle->getCurrentColor();
const osg::Vec3& pos = particle->getPosition();
const Particle* nextParticle = (particle->getNextParticle() != Particle::INVALID_INDEX) ? &_particles[particle->getNextParticle()] : 0;
if (nextParticle)
{
const osg::Vec3& nextPos = nextParticle->getPosition();
osg::Vec3 startDelta = nextPos-pos;
startDelta.normalize();
float distance2 = 0.0;
// now skip particles of required
for(unsigned int i=0;
i<maxNumParticlesToSkip && ((distance2<maxPixelError2) && (nextParticle->getNextParticle()!=Particle::INVALID_INDEX));
++i)
{
nextParticle = &_particles[nextParticle->getNextParticle()];
const osg::Vec3& nextPos = nextParticle->getPosition();
delta = nextPos-pos;
distance2 = (delta^startDelta).length2();
}
delta = nextPos-pos;
}
osg::Vec3 normal( delta ^ (pos-eyeLocal));
normal.normalize();
normal *= particle->getCurrentSize();
osg::Vec3 bottom(pos-normal);
osg::Vec3 top(pos+normal);
glColor4f( color.r(), color.g(), color.b(), color.a() * particle->getCurrentAlpha());
glTexCoord2f( particle->getSTexCoord(), 0.0f );
glVertex3fv(bottom.ptr());
glTexCoord2f( particle->getSTexCoord(), 1.0f );
glVertex3fv(top.ptr());
particle = nextParticle;
}
glEnd();
}
}

1
src/osgParticle/GNUmakefile
View File

@ -6,6 +6,7 @@ CXXFILES =\
ExplosionEffect.cpp\
ExplosionDebrisEffect.cpp\
SmokeEffect.cpp\
SmokeTrailEffect.cpp\
FireEffect.cpp\
FluidFrictionOperator.cpp\
FluidProgram.cpp\

8
src/osgParticle/ModularEmitter.cpp
View File

@ -1,5 +1,6 @@
#include <osgParticle/ModularEmitter>
#include <osgParticle/Emitter>
#include <osgParticle/ConnectedParticleSystem>
#include <osg/Notify>
osgParticle::ModularEmitter::ModularEmitter()
@ -22,6 +23,8 @@ osgParticle::ModularEmitter::ModularEmitter(const ModularEmitter& copy, const os
void osgParticle::ModularEmitter::emit(double dt)
{
ConnectedParticleSystem* cps = dynamic_cast<ConnectedParticleSystem*>(getParticleSystem());
if (getReferenceFrame() == RELATIVE_RF)
{
const osg::Matrix& ltw = getLocalToWorldMatrix();
@ -60,6 +63,9 @@ void osgParticle::ModularEmitter::emit(double dt)
float r = ((float)rand()/(float)RAND_MAX);
P->transformPositionVelocity(ltw, previous_ltw, r);
//P->transformPositionVelocity(ltw);
if (cps) P->setUpTexCoordsAsPartOfConnectedParticleSystem(cps);
}
else
{
@ -77,6 +83,8 @@ void osgParticle::ModularEmitter::emit(double dt)
{
_placer->place(P);
_shooter->shoot(P);
if (cps) P->setUpTexCoordsAsPartOfConnectedParticleSystem(cps);
}
}
}

31
src/osgParticle/Particle.cpp
View File

@ -1,5 +1,6 @@
#include <osgParticle/Particle>
#include <osgParticle/LinearInterpolator>
#include <osgParticle/ParticleSystem>
#include <osg/Vec3>
#include <osg/Vec4>
@ -48,8 +49,8 @@ osgParticle::Particle::Particle()
_cur_tile(-1),
_s_coord(0.0f),
_t_coord(0.0f),
_previousParticle(0),
_nextParticle(0)
_previousParticle(INVALID_INDEX),
_nextParticle(INVALID_INDEX)
{
}
@ -81,10 +82,14 @@ bool osgParticle::Particle::update(double dt)
int currentTile = static_cast<int>(x * _num_tile);
//If the current texture tile is different from previous, then compute new texture coords
if(currentTile != _cur_tile) {
if(currentTile != _cur_tile)
{
_cur_tile = currentTile;
_s_coord = _s_tile * fmod(_cur_tile , 1.0 / _s_tile);
_t_coord = 1.0 - _t_tile * (static_cast<int>(_cur_tile * _t_tile) + 1);
// osg::notify(osg::NOTICE)<<this<<" setting tex coords "<<_s_coord<<" "<<_t_coord<<std::endl;
}
// compute the current values for size, alpha and color.
@ -215,3 +220,23 @@ void osgParticle::Particle::render(const osg::Vec3& xpos, const osg::Vec3& px, c
osg::notify(osg::WARN) << "Invalid shape for particles\n";
}
}
void osgParticle::Particle::setUpTexCoordsAsPartOfConnectedParticleSystem(ParticleSystem* ps)
{
if (getPreviousParticle()!=Particle::INVALID_INDEX)
{
update(0.0);
Particle* previousParticle = ps->getParticle(getPreviousParticle());
const osg::Vec3& previousPosition = previousParticle->getPosition();
const osg::Vec3& newPosition = getPosition();
float distance = (newPosition-previousPosition).length();
float s_coord_delta = 0.5f*distance/getCurrentSize();
float s_coord = previousParticle->_s_coord + s_coord_delta;
setTextureTile(0,0,0);
_cur_tile = 0;
_s_coord = s_coord;
_t_coord = 0.0f;
}
}

24
src/osgParticle/ParticleSystem.cpp
View File

@ -68,17 +68,19 @@ void osgParticle::ParticleSystem::update(double dt)
// reset bounds
_reset_bounds_flag = true;
// set up iterators for particles
Particle_vector::iterator i;
Particle_vector::iterator end = _particles.end();
// update particles
for (i=_particles.begin(); i!=end; ++i) {
if (i->isAlive()) {
if (i->update(dt)) {
update_bounds(i->getPosition(), i->getCurrentSize());
} else {
_deadparts.push(&(*i));
for(unsigned int i=0; i<_particles.size(); ++i)
{
Particle& particle = _particles[i];
if (particle.isAlive())
{
if (particle.update(dt))
{
update_bounds(particle.getPosition(), particle.getCurrentSize());
}
else
{
reuseParticle(i);
}
}
}
@ -141,6 +143,8 @@ void osgParticle::ParticleSystem::setDefaultAttributes(const std::string& textur
texture->setImage(osgDB::readImageFile(texturefile));
texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::MIRROR);
texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::MIRROR);
stateset->setTextureAttributeAndModes(texture_unit, texture, osg::StateAttribute::ON);
osg::TexEnv *texenv = new osg::TexEnv;

149
src/osgParticle/SmokeTrailEffect.cpp Normal file
View File

@ -0,0 +1,149 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osgParticle/SmokeTrailEffect>
#include <osgParticle/ConstantRateCounter>
#include <osgParticle/RadialShooter>
#include <osgParticle/SectorPlacer>
#include <osgParticle/ParticleSystemUpdater>
#include <osgParticle/ConnectedParticleSystem>
#include <osg/Geode>
using namespace osgParticle;
SmokeTrailEffect::SmokeTrailEffect(const osg::Vec3& position, float scale, float intensity)
{
setDefaults();
_position = position;
_scale = scale;
_intensity = intensity;
_emitterDuration = 65.0;
_defaultParticleTemplate.setLifeTime(5.0*_scale);
buildEffect();
}
SmokeTrailEffect::SmokeTrailEffect(const SmokeTrailEffect& copy, const osg::CopyOp& copyop):
ParticleEffect(copy,copyop)
{
}
void SmokeTrailEffect::setDefaults()
{
ParticleEffect::setDefaults();
_textureFileName = "Images/continous_smoke.rgb";
_emitterDuration = 65.0;
// set up unit particle.
_defaultParticleTemplate.setLifeTime(5.0*_scale);
_defaultParticleTemplate.setSizeRange(osgParticle::rangef(0.75f, 2.0f));
_defaultParticleTemplate.setAlphaRange(osgParticle::rangef(0.7f, 1.0f));
_defaultParticleTemplate.setColorRange(osgParticle::rangev4(
osg::Vec4(1, 1.0f, 1.0f, 1.0f),
osg::Vec4(1, 1.0f, 1.f, 0.0f)));
}
void SmokeTrailEffect::setUpEmitterAndProgram()
{
// set up particle system
if (!_particleSystem)
{
_particleSystem = new osgParticle::ConnectedParticleSystem;
}
if (_particleSystem.valid())
{
_particleSystem->setDefaultAttributes(_textureFileName, false, false);
osgParticle::Particle& ptemplate = _particleSystem->getDefaultParticleTemplate();
float radius = 0.5f*_scale;
float density = 1.0f; // 1.0kg/m^3
ptemplate.setLifeTime(_defaultParticleTemplate.getLifeTime());
// the following ranges set the envelope of the respective
// graphical properties in time.
ptemplate.setSizeRange(osgParticle::rangef(radius*_defaultParticleTemplate.getSizeRange().minimum,
radius*_defaultParticleTemplate.getSizeRange().maximum));
ptemplate.setAlphaRange(_defaultParticleTemplate.getAlphaRange());
ptemplate.setColorRange(_defaultParticleTemplate.getColorRange());
// these are physical properties of the particle
ptemplate.setRadius(radius);
ptemplate.setMass(density*radius*radius*radius*osg::PI*4.0f/3.0f);
}
// set up emitter
if (!_emitter)
{
_emitter = new osgParticle::ModularEmitter;
_emitter->setCounter(new osgParticle::ConstantRateCounter);
_emitter->setPlacer(new osgParticle::SectorPlacer);
_emitter->setShooter(new osgParticle::RadialShooter);
}
if (_emitter.valid())
{
_emitter->setParticleSystem(_particleSystem.get());
_emitter->setReferenceFrame(_useLocalParticleSystem?
osgParticle::ParticleProcessor::ABSOLUTE_RF:
osgParticle::ParticleProcessor::RELATIVE_RF);
_emitter->setStartTime(_startTime);
_emitter->setLifeTime(_emitterDuration);
_emitter->setEndless(false);
osgParticle::ConstantRateCounter* counter = dynamic_cast<osgParticle::ConstantRateCounter*>(_emitter->getCounter());
if (counter)
{
counter->setMinimumNumberOfParticlesToCreate(1);
counter->setNumberOfParticlesPerSecondToCreate(0.0);
}
osgParticle::SectorPlacer* placer = dynamic_cast<osgParticle::SectorPlacer*>(_emitter->getPlacer());
if (placer)
{
placer->setCenter(_position);
placer->setRadiusRange(0.0f*_scale,0.0f*_scale);
}
osgParticle::RadialShooter* shooter = dynamic_cast<osgParticle::RadialShooter*>(_emitter->getShooter());
if (shooter)
{
shooter->setThetaRange(0.0f, 0.0f);
shooter->setInitialSpeedRange(0.0f*_scale,0.0f*_scale);
}
}
// set up program.
if (!_program)
{
_program = new osgParticle::FluidProgram;
}
if (_program.valid())
{
_program->setParticleSystem(_particleSystem.get());
_program->setWind(_wind);
}
}