/**
* Process stimulus method that computes appropriate level of detail.
*
* @param criteria an enumeration of the criteria that caused the stimulus
*/
@Override
public void processStimulus(Enumeration criteria) {
// compute distance in virtual world
View v = this.getView();
if (v == null) {
wakeupOn(wakeupFrame);
return;
}
ViewPlatform vp = v.getViewPlatform();
if (vp == null) {
return;
}
// Handle stimulus
double viewDistance = 0.0;
int nSwitches, i, index = 0;
Transform3D localToWorldTrans = new Transform3D();
localToWorldTrans.set(((NodeRetained) this.retained).getCurrentLocalToVworld());
// DistanceLOD's location in virutal world
localToWorldTrans.transform(position, center);
viewPosition.x = (float) ((ViewPlatformRetained) vp.retained).schedSphere.center.x;
viewPosition.y = (float) ((ViewPlatformRetained) vp.retained).schedSphere.center.y;
viewPosition.z = (float) ((ViewPlatformRetained) vp.retained).schedSphere.center.z;
viewDistance = center.distance(viewPosition);
// convert distance into local coordinates
viewDistance = viewDistance / localToWorldTrans.getDistanceScale();
nSwitches = numSwitches();
index = distances.length; // viewDistance > distances[n-1]
if (viewDistance <= distances[0]) {
index = 0;
} else {
for (i = 1; i < distances.length; i++) {
if ((viewDistance > distances[i - 1]) && (viewDistance <= distances[i])) {
index = i;
break;
}
}
}
for (i = nSwitches - 1; i >= 0; i--) {
Switch sw = getSwitch(i);
// Optimize, this behavior is passive
// Note that we skip the capability check for getWhichChild()
if (((SwitchRetained) sw.retained).getWhichChild() != index) {
sw.setWhichChild(index);
}
}
// Insert wakeup condition into queue
wakeupOn(wakeupFrame);
}
/**
* Retrieves the current position of this LOD node. This position is in the local coordinates of
* this node.
*
* @param position the object that will receive the current position
*/
public void getPosition(Point3f position) {
if (((NodeRetained) retained).staticTransform != null) {
Transform3D invTransform = ((NodeRetained) retained).staticTransform.getInvTransform();
invTransform.transform(this.position, position);
} else {
position.set(this.position);
}
}