private Spatial createFollowBox() {
// add spatial representing the position the driving car is steering towards
Box box = new Box(new Vector3f(0, 0, 0), 1f, 1f, 1f);
Geometry followBox = new Geometry("followBox", box);
followBox.setLocalTranslation(0, 0, 0);
Material followBoxMaterial =
new Material(sim.getAssetManager(), "Common/MatDefs/Misc/Unshaded.j3md");
followBoxMaterial.setColor("Color", ColorRGBA.Green);
followBox.setMaterial(followBoxMaterial);
followBox.setLocalScale(0.4f);
sim.getSceneNode().attachChild(followBox);
if (!settings.isPathVisible()) followBox.setCullHint(CullHint.Always);
return followBox;
}
public FollowBox(Simulator sim, final TrafficCar vehicle, FollowBoxSettings settings) {
this.sim = sim;
this.vehicle = vehicle;
this.settings = settings;
waypointList = settings.getWayPoints();
maxDistance = settings.getMaxDistance();
motionPath = new MotionPath();
motionPath.setCycle(settings.isPathCyclic());
for (Waypoint wayPoint : waypointList) motionPath.addWayPoint(wayPoint.getPosition());
motionPath.setPathSplineType(SplineType.CatmullRom); // --> default: CatmullRom
motionPath.setCurveTension(settings.getCurveTension());
if (settings.isPathVisible())
motionPath.enableDebugShape(sim.getAssetManager(), sim.getSceneNode());
motionPath.addListener(
new MotionPathListener() {
public void onWayPointReach(MotionTrack control, int wayPointIndex) {
// set speed limit for next way point
int index = wayPointIndex % waypointList.size();
float speed = waypointList.get(index).getSpeed();
setSpeed(speed);
// if last way point reached
if (motionPath.getNbWayPoints() == wayPointIndex + 1) {
// reset vehicle to first way point if not cyclic
if (!motionPath.isCycle()) setToWayPoint(0);
}
}
});
followBox = createFollowBox();
motionControl = new MotionTrack(followBox, motionPath);
// get start way point
int startWayPointIndex = settings.getStartWayPointIndex();
// set start speed
float initialSpeed = waypointList.get(startWayPointIndex).getSpeed();
setSpeed(initialSpeed);
// set start position
setToWayPoint(startWayPointIndex);
// move object along path considering rotation
motionControl.setDirectionType(MotionTrack.Direction.PathAndRotation);
// loop movement of object
motionControl.setLoopMode(LoopMode.Loop);
// rotate moving object
// motionControl.setRotation(new Quaternion().fromAngleNormalAxis(-FastMath.HALF_PI,
// Vector3f.UNIT_Y));
// set moving object to position "20 seconds"
// motionPath.interpolatePath(20, motionControl);
// start movement
// motionControl.play(); // already contained in update method
}