...
For this to work many of the existing classes had to be refactored to use common methods to ensure consistency. Furthermore the current HelixSwimmer has to rely on the implementation of Track being broken in the same way as ReconTrack...
Code Examples
If you want the new Tracks in the event, it's as easy as
import org.lcsim.contrib.JanStrube.tracking.NewMCFastTrackDriver;
...
loop.add(NewMCFastTrackDriver());
For more control, you will need to instantiate a Factory that can give you the Tracks. (The Track doesn't know anything about the B field, so it can't translate from MCParticle parameters to LCIO Track parameters by itself)
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NewFastMCTrackFactory factory = new NewFastMCTrackFactory(event, false);
for (MCParticle daughter : part.getDaughters()) {
Track unsmearedTrack = tf.getTrack(
new SpaceVector(daughter.getMomentum()), // momentum
new SpacePoint(daughter.getOrigin()), // position
new SpacePoint(part.getEndPoint()), // reference point
(int)daughter.getCharge(), // charge
rand, // random generator for smearing
false); // smearing ? default is true
Track smearedTrack = tf.getTrack(
new SpaceVector(daughter.getMomentum()),
new SpacePoint(daughter.getOrigin()),
new SpacePoint(part.getEndPoint()),
(int)daughter.getCharge(),
rand,
true);
}
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For more information please consult the source code. I will try to expand on the examples.