public void update() {
if (systems == null || systems[index] == null) {
reset(index);
}
for (int j = 0; j < maxStep; j++) {
ParticleSystem system = systems[j];
if (system == null) {
break;
}
Vector3 addAccel = THREE.Vector3(0, accel.getY() * steps[j], 0);
for (int i = 0; i < particleSize; i++) {
Vector3 vertex = system.getGeometry().vertices().get(i);
vertex.addSelf(velocity);
vertex.addSelf(addVelocities[j][i]);
vertex.addSelf(wind);
vertex.addSelf(addAccel); // do slow
// vertex.getPosition().addSelf(winds[i]);
}
system.getGeometry().setVerticesNeedUpdate(true);
((ParticleBasicMaterial) system.getMaterial()).setSize(baseSize + changeSize * steps[j]);
((ParticleBasicMaterial) system.getMaterial())
.setOpacity(Math.max(0, 1 - changeOpacity * steps[j]));
steps[j]++;
if (steps[j] == maxStep) {
reset(j);
steps[j] = 0;
}
}
index++;
if (index == maxStep) {
index = 0;
}
}
