void particleSystem::init(){
printf("Initiating Particles... ");
spacing = 1.f;
simW = 100.f;
bottom = 0.0;
lifetime = 1000.0;
kill = false;
particleType = basic;
setup = cube;
particleSize = spacing;
globalForce = Vec2(0.0,0.0);
setupParticles(setup,1);
printf("done\n");
}
KDvoid Sample_ParticleFX::setupContent ( KDvoid )
{
// setup some basic lighting for our scene
m_pSceneMgr->setAmbientLight ( ColourValue ( 0.3, 0.3, 0.3 ) );
m_pSceneMgr->createLight ( )->setPosition ( 20, 80, 50 );
// set our camera to orbit around the origin and show cursor
m_pCameraMan->setStyle ( CS_ORBIT );
m_pCameraMan->setYawPitchDist ( Degree ( 0 ), Degree ( 15 ), 250 );
m_pTrayMgr->showCursor ( );
// create an ogre head entity and place it at the origin
Entity* pEntity = m_pSceneMgr->createEntity ( "Head", "ogrehead.mesh" );
m_pSceneMgr->getRootSceneNode ( )->attachObject ( pEntity );
setupParticles ( ); // setup particles
setupTogglers ( ); // setup particle togglers
}
//--------------------------------------------------------------
void testApp::update(){
ofVec3f diff ; //Difference between particle and mouse
float dist ; //distance from particle to mouse ( as the crow flies )
float ratio ; //Ratio of how strong the effect is = 1 + (-dist/maxDistance) ;
const ofVec3f mousePosition = ofVec3f( mouseX , mouseY , 0 ) ; //Allocate and retrieve mouse values once.
const ofVec3f origin = ofVec3f(0,0,0);
//Create an iterator to cycle through the vector
std::vector<Particle>::iterator p ;
for ( p = particles.begin() ; p != particles.end() ; p++ )
{
ratio = 1.0f ;
p->velocity *= friction ;
//reset acceleration every frame
p->acceleration = ofVec3f() ;
diff = mousePosition - p->position ;
dist = mousePosition.distance( p->position ) ;
//If within the zone of interaction
if ( dist * .5 < forceRadius )
{
ratio = -1 + dist / forceRadius ;
//Repulsion
if ( cursorMode == 0 )
p->acceleration -= ( diff * ratio) ;
//Attraction
else
p->acceleration += ( diff * ratio ) ;
}
if ( springEnabled )
{
//Move back to the original position
p->acceleration += springFactor * (p->spawnPoint - p->position );
}
p->velocity += p->acceleration * ratio ;
p->position += p->velocity ;
}
if ( ofGetFrameNum() % 300 == 0 )
{
curImageIndex++ ;
setupParticles() ;
}
}
//--------------------------------------------------------------
void ofApp::setup(){
bGuiVisible = false;
particlesW = 1280;
particlesH = 800;
setupGui();
width = 1280;
height = 800;
videoIn.setDeviceID(0);
videoIn.setDesiredFrameRate(60);
videoIn.initGrabber(VIDEO_WIDTH, VIDEO_HEIGHT, true);
setupParticles();
iPreset = 1;
load( iPreset );
bDebug = false;
}
void electromagnetica::resetParticles(){
particles.clear();
setupParticles();
}
void electromagnetica::setupShader(){
shader.load("", "shaders/whitenoise.frag");
setupParticles();
}
