private long trackId;
private long id;
public Particle(int id, String x, String y, String z) {
this.id = id;
this.r.set(X, new Decimal(x));
this.r.set(Y, new Decimal(y));
this.r.set(Z, new Decimal(z));
this.v.set(X, new Decimal());
this.v.set(Y, new Decimal());
this.v.set(Z, new Decimal());
this.snapshotId = VOID_SNAPSHOT_ID;
this.trackId = VOID_TRACK_ID;
}