void unlockRandomParticles() {
for(int i=0; i<physics.numberOfParticles(); i++) {
Physics::Particle3D *p = physics.getParticle(i);
p->makeFree();
}
mouseNode.makeFixed();
}
void lockRandomParticles() {
for(int i=0; i<physics.numberOfParticles(); i++) {
Physics::Particle3D *p = physics.getParticle(i);
if(ofRandom(0, 100) < FIX_PROBABILITY) p->makeFixed();
else p->makeFree();
}
mouseNode.makeFixed();
}