Hey monkey,
i read all tutorials and now, i wants to create my first little game. I write on a little tower defence game. Every tower has got a fire range to implement that basic feature i used physics.
As “CollisionMesh” I used a Sphere.
My Towers are controlled by TowerControl which uses PhysicsCollisionListener. So I can see if a enemy is inside the sphere or not. The enemy will be attacked and destroy it, as well, but if i create a 2. Tower in the range of the first tower, they only find themselves and don’t attack my enemy. Is there a possbility to iterate throw all objects in the sphere or have i to implement it on a differen way? Hope you are able to help me 
[java]
public PhysicsCollisionListener pcl = new PhysicsCollisionListener() {
public void collision(PhysicsCollisionEvent pce) {
Spatial tower = null;
Spatial enemy = null;
if(pce.getNodeA().getName().equals(“enemy”) || pce.getNodeB().getName().equals(“enemy”))
{
System.out.println(“ATTACK enemy”);
if(pce.getNodeA().getName().equals(“tower”) == true){
tower = pce.getNodeA();
enemy = pce.getNodeB();
}
else{
tower = pce.getNodeB();
enemy = pce.getNodeA();
}
// ATTACK!!
[/java]
Tower.java
[java]
public void buildTower(Vector3f pos)
{
this.pos = pos;
this.lookAt = Vector3f.ZERO;
//temp
Box box = new Box(new Vector3f(0,0,0),1,1,1);
Material mat = new Material(assetManager,“Common/MatDefs/Misc/Unshaded.j3md”);
mat.setColor(“Color”, ColorRGBA.Blue);
towerSpatial = new Geometry(“tower”, box);
towerSpatial.setMaterial(mat);
towerNode.attachChild(towerSpatial);
rootNode.attachChild(towerNode);
towerSpatial.setLocalTranslation(pos.x,pos.y+1.0f,pos.z);
towerSpatial.setUserData(“range”, this.range);
towerSpatial.setUserData(“speed”,this.speed);
towerSpatial.setUserData(“damage”, this.damage);
towerSpatial.addControl(new TowerControl());
towerSpatial.addControl(gc);
}
[/java]
http://imageshack.us/photo/my-images/266/tag4.png/
And what about make the towers with different names?
[java]
public void buildTower(Vector3f pos, int i)
{
…
towerSpatial = new Geometry("tower"+i, box);
…
}
[/java]
Oh,
nice idea, but result.
I tried it like norman said in another post
[java] public PhysicsCollisionListener pcl = new PhysicsCollisionListener() {
Spatial enemy = null;
Spatial tower = null;
public void collision(PhysicsCollisionEvent pce) {
if(1.0f <= timer.getTimeInSeconds()){
timer.reset();
if(pce.getNodeA().getUserData(“killable”) == Boolean.TRUE && pce.getNodeA().getUserData(“killable”)==Boolean.FALSE){
enemy = pce.getNodeA();
tower = pce.getNodeB();
ec = enemy.getControl(EnemyController.class);
System.out.println(ec.getEnemyLife());
ec.lessLife(20);
System.out.println(enemy.getName()+" “+tower.getName());
}else if(pce.getNodeB().getUserData(“killable”) == Boolean.TRUE && pce.getNodeA().getUserData(“killable”)==Boolean.FALSE){
enemy = pce.getNodeB();
tower = pce.getNodeA();
System.out.println(enemy.getName()+” "+tower.getName());
ec = enemy.getControl(EnemyController.class);
System.out.println(ec.getEnemyLife());
ec.lessLife(20);
}
}
}
};[/java]
but won’t work as well 
[java]public PhysicsCollisionListener pcl = new PhysicsCollisionListener() {
Spatial enemy = null;
Spatial tower = null;
public void collision(PhysicsCollisionEvent pce) {
if(1.0f <= timer.getTimeInSeconds()){
timer.reset();
if(pce.getNodeA().getUserData(“killable”) == Boolean.TRUE && pce.getNodeA().getUserData(“killable”)==Boolean.FALSE){
enemy = pce.getNodeA();
tower = pce.getNodeB();
ec = enemy.getControl(EnemyController.class);
System.out.println(ec.getEnemyLife());
ec.lessLife(20);
System.out.println(enemy.getName()+" “+tower.getName());
}else if(pce.getNodeB().getUserData(“killable”) == Boolean.TRUE && pce.getNodeA().getUserData(“killable”)==Boolean.FALSE){
enemy = pce.getNodeB();
tower = pce.getNodeA();
System.out.println(enemy.getName()+” “+tower.getName());
ec = enemy.getControl(EnemyController.class);
System.out.println(ec.getEnemyLife());
ec.lessLife(20);
}
else{
System.out.println(pce.getNodeA().getName()+” "+pce.getNodeB().getName());
}
}
}
};[/java]
here is a little test
http://imageshack.us/f/190/screenshotzso.png/
have a look at the picture and see the consol output
Any Idea’s?
EDIT: Blue are towers and reds are enemys…
The tower will build this way
[java]f (money >= Tower.cost) {
tower = new Tower(assetManager, rootNode);
tower.buildTower(closest.getContactPoint(),++i);
money -= Tower.cost;
bulletAppState.getPhysicsSpace().add(tower.getTowerSpatial());
bulletAppState.getPhysicsSpace().addCollisionListener(new TowerControl().pcl);[/java]
if(pce.getNodeA().getUserData("killable") == Boolean.TRUE && pce.getNodeA().getUserData("killable")==Boolean.FALSE){
:?:?:?:?:?.
According to my almost 2 years of Java Knowledge, this conditions is unreachable xD.
keep in mind that collision meshs are hollow, and that a collision event will only occur when the collision shapes intersect, so if the enemy collision shape is completely inside the tower collision sphere, there will be no collision events.
if(pce.getNodeA().getUserData(“killable”) == Boolean.TRUE && pce.getNodeA().getUserData(“killable”)==Boolean.FALSE){
xD
fucking copy & past ^^
@thetoucher
Thank you very mutch 
Any idea how can i handle this stuff??