void LinearForceAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Vector3 scaledVector = Vector3::ZERO;
// Precalc scaled force for optimisation
if (mForceApplication == FA_ADD)
{
// Scale force by time
scaledVector = mForceVector * timeElapsed;
}
while (!pi.end())
{
p = pi.getNext();
if (mForceApplication == FA_ADD)
{
p->direction += scaledVector;
}
else // FA_AVERAGE
{
p->direction = (p->direction + mForceVector) / 2;
}
}
}
void processParticles()
{
static int pindex = 0 ;
ParticleIterator pit = particleSystem->_getIterator() ;
while(!pit.end()) {
Particle *particle = pit.getNext();
Vector3 ppos = particle->position;
if (ppos.y<=0 && particle->timeToLive>0) { // hits the water!
// delete particle
particle->timeToLive = 0.0f;
// push the water
float x = ppos.x / PLANE_SIZE * COMPLEXITY ;
float y = ppos.z / PLANE_SIZE * COMPLEXITY ;
float h = rand() % RAIN_HEIGHT_RANDOM + RAIN_HEIGHT_CONSTANT ;
if (x<1) x=1 ;
if (x>COMPLEXITY-1) x=COMPLEXITY-1;
if (y<1) y=1 ;
if (y>COMPLEXITY-1) y=COMPLEXITY-1;
waterMesh->push(x,y,-h) ;
WaterCircle *circle = new WaterCircle(
"Circle#"+StringConverter::toString(pindex++),
x, y);
circles.push_back(circle);
}
}
}
//-----------------------------------------------------------------------
void DirectionRandomiserAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Real length = 0;
while (!pi.end())
{
p = pi.getNext();
if (mScope > Math::UnitRandom())
{
if (!p->direction.isZeroLength())
{
if (mKeepVelocity)
{
length = p->direction.length();
}
p->direction += Vector3(Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed,
Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed,
Math::RangeRandom(-mRandomness, mRandomness) * timeElapsed);
if (mKeepVelocity)
{
p->direction *= length / p->direction.length();
}
}
}
}
}
//-----------------------------------------------------------------------
void DeflectorPlaneAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
// precalculate distance of plane from origin
Real planeDistance = - mPlaneNormal.dotProduct(mPlanePoint) / Math::Sqrt(mPlaneNormal.dotProduct(mPlaneNormal));
Vector3 directionPart;
ParticleIterator pi = pSystem->_getIterator();
while (!pi.end())
{
Particle *p = pi.getNext();
Vector3 direction(p->mDirection * timeElapsed);
if (mPlaneNormal.dotProduct(p->mPosition + direction) + planeDistance <= 0.0)
{
Real a = mPlaneNormal.dotProduct(p->mPosition) + planeDistance;
if (a > 0.0)
{
// for intersection point
directionPart = direction * (- a / direction.dotProduct( mPlaneNormal ));
// set new position
p->mPosition = (p->mPosition + ( directionPart )) + (((directionPart) - direction) * mBounce);
// reflect direction vector
p->mDirection = (p->mDirection - (2.0f * p->mDirection.dotProduct( mPlaneNormal ) * mPlaneNormal)) * mBounce;
}
}
}
}
//-----------------------------------------------------------------------
void ScaleAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Real ds;
// Scale adjustments by time
ds = mScaleAdj * timeElapsed;
Real NewWide, NewHigh;
while (!pi.end())
{
p = pi.getNext();
if( p->hasOwnDimensions() == false )
{
NewWide = pSystem->getDefaultWidth() + ds;
NewHigh = pSystem->getDefaultHeight() + ds;
}
else
{
NewWide = p->getOwnWidth() + ds;
NewHigh = p->getOwnHeight() + ds;
}
p->setDimensions( NewWide, NewHigh );
}
}
//-----------------------------------------------------------------------
void MeshRotationAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Real ds;
// Rotation adjustments by time
ds = timeElapsed;
while (!pi.end())
{
p = pi.getNext();
MeshParticleVisualData *data = static_cast<MeshParticleVisualData *>(p->getVisualData());
data->mYawRotation = data->mYawRotation + ds * data->mYawRotationSpeed;
data->mPitchRotation = data->mPitchRotation + ds * data->mPitchRotationSpeed;
data->mRollRotation = data->mRollRotation + ds * data->mRollRotationSpeed;
if ( data->mYawRotation != Radian(0) || data->mPitchRotation != Radian(0) ||
data->mRollRotation != Radian(0) )
pSystem->_notifyParticleRotated();
}
}
//-----------------------------------------------------------------------
void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
Particle* p;
ParticleIterator pi = pSystem->_getIterator();
if (!mColourImageLoaded)
{
_loadImage();
}
int width = (int)mColourImage.getWidth() - 1;
while (!pi.end())
{
p = pi.getNext();
const Real life_time = p->totalTimeToLive;
Real particle_time = 1.0f - (p->timeToLive / life_time);
if (particle_time > 1.0f)
particle_time = 1.0f;
if (particle_time < 0.0f)
particle_time = 0.0f;
const Real float_index = particle_time * width;
const int index = (int)float_index;
if(index < 0)
{
p->colour = mColourImage.getColourAt(0, 0, 0);
}
else if(index >= width)
{
p->colour = mColourImage.getColourAt(width, 0, 0);
}
else
{
// Linear interpolation
const Real fract = float_index - (Real)index;
const Real to_colour = fract;
const Real from_colour = 1.0f - to_colour;
ColourValue from=mColourImage.getColourAt(index, 0, 0),
to=mColourImage.getColourAt(index+1, 0, 0);
p->colour.r = from.r*from_colour + to.r*to_colour;
p->colour.g = from.g*from_colour + to.g*to_colour;
p->colour.b = from.b*from_colour + to.b*to_colour;
p->colour.a = from.a*from_colour + to.a*to_colour;
}
}
}
void RotationAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Real ds;
// Rotation adjustments by time
ds = timeElapsed;
Radian NewRotation;
while (!pi.end())
{
p = pi.getNext();
NewRotation = p->rotation + (ds * p->rotationSpeed);
p->setRotation( NewRotation );
}
}
//-----------------------------------------------------------------------
void ColourFaderAffector2::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
float dr1, dg1, db1, da1;
float dr2, dg2, db2, da2;
// Scale adjustments by time
dr1 = mRedAdj1 * timeElapsed;
dg1 = mGreenAdj1 * timeElapsed;
db1 = mBlueAdj1 * timeElapsed;
da1 = mAlphaAdj1 * timeElapsed;
// Scale adjustments by time
dr2 = mRedAdj2 * timeElapsed;
dg2 = mGreenAdj2 * timeElapsed;
db2 = mBlueAdj2 * timeElapsed;
da2 = mAlphaAdj2 * timeElapsed;
while (!pi.end())
{
p = pi.getNext();
if( p->timeToLive > StateChangeVal )
{
applyAdjustWithClamp(&p->colour.r, dr1);
applyAdjustWithClamp(&p->colour.g, dg1);
applyAdjustWithClamp(&p->colour.b, db1);
applyAdjustWithClamp(&p->colour.a, da1);
}
else
{
applyAdjustWithClamp(&p->colour.r, dr2);
applyAdjustWithClamp(&p->colour.g, dg2);
applyAdjustWithClamp(&p->colour.b, db2);
applyAdjustWithClamp(&p->colour.a, da2);
}
}
}
//-----------------------------------------------------------------------
void MeshAnimationAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
while (!pi.end())
{
p = pi.getNext();
MeshParticleVisualData *data = static_cast<MeshParticleVisualData *>(p->getVisualData());
data->mAnimationName = mAnimationName;
data->mDeltaTime = timeElapsed;
data->mAnimationLoop = mAnimationLoop;
data->mAnimationSpeedFactor = mAnimationSpeedFactor;
data->mAnimationUpdated = true;
}
}
//-----------------------------------------------------------------------
void ColourFaderAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
float dr, dg, db, da;
// Scale adjustments by time
dr = mRedAdj * timeElapsed;
dg = mGreenAdj * timeElapsed;
db = mBlueAdj * timeElapsed;
da = mAlphaAdj * timeElapsed;
while (!pi.end())
{
p = pi.getNext();
applyAdjustWithClamp(&p->colour.r, dr);
applyAdjustWithClamp(&p->colour.g, dg);
applyAdjustWithClamp(&p->colour.b, db);
applyAdjustWithClamp(&p->colour.a, da);
}
}
//-----------------------------------------------------------------------
void ColourInterpolatorAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
Particle* p;
ParticleIterator pi = pSystem->_getIterator();
while (!pi.end())
{
p = pi.getNext();
const Real life_time = p->totalTimeToLive;
Real particle_time = 1.0f - (p->timeToLive / life_time);
if (particle_time <= mTimeAdj[0])
{
p->colour = mColourAdj[0];
} else
if (particle_time >= mTimeAdj[MAX_STAGES - 1])
{
p->colour = mColourAdj[MAX_STAGES-1];
} else
{
for (int i=0;i<MAX_STAGES-1;i++)
{
if (particle_time >= mTimeAdj[i] && particle_time < mTimeAdj[i + 1])
{
particle_time -= mTimeAdj[i];
particle_time /= (mTimeAdj[i+1]-mTimeAdj[i]);
p->colour.r = ((mColourAdj[i+1].r * particle_time) + (mColourAdj[i].r * (1.0f - particle_time)));
p->colour.g = ((mColourAdj[i+1].g * particle_time) + (mColourAdj[i].g * (1.0f - particle_time)));
p->colour.b = ((mColourAdj[i+1].b * particle_time) + (mColourAdj[i].b * (1.0f - particle_time)));
p->colour.a = ((mColourAdj[i+1].a * particle_time) + (mColourAdj[i].a * (1.0f - particle_time)));
break;
}
}
}
}
}
//-----------------------------------------------------------------------
void FireExtinguisherAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
ExtinguishableFireAffectorFactory::affectorIterator affIt = mEfaf->getAffectorIterator();
ExtinguishableFireAffector* fire;
while(affIt.hasMoreElements())
{
fire = (ExtinguishableFireAffector*)affIt.getNext();
if (fire->isTemplate())
continue;
Real squaredRadius = Math::Pow(fire->getRadius(), 2);
Vector3 middlePoint = fire->getAbsoluteMiddlePoint();
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
int fireHits = 0;
while (!pi.end())
{
p = pi.getNext();
if ( middlePoint.squaredDistance(p->position) < squaredRadius )
{
// This particle is inside the fire, dispose of it in the next update
p->timeToLive = 0;
++fireHits;
}
}
if (fireHits>0)
{
Real intensity = fire->reduceIntensity(fireHits*mEffectiveness);
if (intensity<0) delete fire->getParticleSystem();
}
}
}
//-----------------------------------------------------------------------
void RevolutionAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
{
// 因为timeElapsed有可能有0，加上判断，避免除0错
if (false == Ogre::Math::RealEqual(timeElapsed, 0.0f))
{
ParticleIterator pi = pSystem->_getIterator();
Particle *p;
Quaternion q( Radian(Degree(mRotationSpeed*timeElapsed).valueRadians()), mRotateAxis);
Matrix3 mat(Matrix3::IDENTITY);
q.ToRotationMatrix(mat);
Ogre::Vector3 randomPoint;
randomPoint.x = Math::RangeRandom(mCenterOffsetMin.x, mCenterOffsetMax.x);
randomPoint.y = Math::RangeRandom(mCenterOffsetMin.y, mCenterOffsetMax.y);
randomPoint.z = Math::RangeRandom(mCenterOffsetMin.z, mCenterOffsetMax.z);
Vector3 particleSystemPos(Vector3::ZERO);
bool localSpace = pSystem->getKeepParticlesInLocalSpace();
particleSystemPos = pSystem->getParentSceneNode()->_getDerivedPosition();
Ogre::Vector3 destPoint = particleSystemPos + randomPoint;
Vector3 particlePos(Vector3::ZERO);
Vector3 RadiusIncrementDir(Vector3::ZERO);
bool needFmod = mRepeatTimes != 1.0f;
while (!pi.end())
{
p = pi.getNext();
particlePos = p->position;
/** 如果是localSpace，那么p->position得到的是粒子的相对位置，所以要加上
粒子系统的位置particleSystemPos，得到绝对位置，再减去destPoint才能得到
正确的向量
particlePos + particleSystemPos - destPoint
= particlePos + particleSystemPos - particleSystemPos - randomPoint
= particlePos - randomPoint
*/
if (localSpace)
{
RadiusIncrementDir = particlePos - randomPoint;
RadiusIncrementDir.normalise();
particlePos = mat *( particlePos - randomPoint ) + randomPoint - particlePos;
}
else
{
RadiusIncrementDir = particlePos - destPoint;
RadiusIncrementDir.normalise();
particlePos = mat *( particlePos - destPoint ) + destPoint - particlePos;
}
p->direction = particlePos / timeElapsed;
if (mUseRadiusIncrementScale)
{
const Real life_time = p->totalTimeToLive;
Real particle_time = 1.0f - (p->timeToLive / life_time);
// wrap the particle time
Real repeatedParticleTime =
needFmod ? fmod( particle_time * mRepeatTimes, 1.0f ) : particle_time;
if (repeatedParticleTime <= mTimeAdj[0])
{
p->direction += RadiusIncrementDir * mRadiusIncrementAdj[0];
}
else if (repeatedParticleTime >= mTimeAdj[MAX_STAGES - 1])
{
p->direction += RadiusIncrementDir * mRadiusIncrementAdj[MAX_STAGES - 1];
}
else
{
for (int i=0;i<MAX_STAGES-1;i++)
{
if (repeatedParticleTime >= mTimeAdj[i] && repeatedParticleTime < mTimeAdj[i + 1])
{
repeatedParticleTime -= mTimeAdj[i];
repeatedParticleTime /= (mTimeAdj[i+1]-mTimeAdj[i]);
p->direction += RadiusIncrementDir *
( (mRadiusIncrementAdj[i+1] * repeatedParticleTime) + (mRadiusIncrementAdj[i] * (1.0f - repeatedParticleTime)) );
break;
}
}
}
}
else
{
p->direction += RadiusIncrementDir*mRadiusIncrement;
}
// case RotationType::OUTER_NORMAL:
//// p->direction.x += pos.x;
// // p->direction.z += pos.z;
// p->direction = pos;
// break;
// case RotationType::OUTER_FAST:
//// p->direction.x += (p->direction.x + pos.x) /2;
// // p->direction.z += (p->direction.z + pos.z) /2;
// p->direction += (p->direction + pos) /2;
// break;
}
}
}