/**
* Refreshes the derivatives if they have not been refreshed in the refreshSteps() method (ie if
* the variable "refreshDerivsLater" is false).
*/
protected void refreshDerivsIfNeeded() {
if (!refreshDerivsLater) return;
refreshDerivsLater = false;
for (ParticleModel part : getModels()) {
part.updateDerivatives();
part.firePropertyChange("steps", null, null); // $NON-NLS-1$
}
}
