How do I execute a callback when JBullet detects a collision? - callback

Question

So currently I have an instance of JBullet running on its own thread and I have no idea how to get information about collisions on JBullet 20101010-1.
I have tried calling ContactAddedCallback as shown below but nothing happens.
new ContactAddedCallback() {
#Override
public boolean contactAdded(ManifoldPoint cp, CollisionObject colObj0, int partId0, int index0,
CollisionObject colObj1, int partId1, int index1) {
System.out.println("Collision");
return false;
}
};

Answer 1

you must add ContactAddedCallback to BulletGlobals
to do that after you create a ContactAddedCallback like this ::
ContactAddedCallback myCollisionCallback = new ContactAddedCallback() {
#Override
public boolean contactAdded(
ManifoldPoint cp,
CollisionObject colObj0,
int partId0,
int index0,
CollisionObject colObj1,
int partId1,
int index1) {
System.out.println("hi i am collision !!");// :|
return false;
}
};
and add flag to rigidbody like this ::
rb = new RigidBody(constructionInfo);
rb.setCollisionFlags(CollisionFlags.CUSTOM_MATERIAL_CALLBACK);
now add to BulletGlobals Like this ::
BulletGlobals.setContactAddedCallback( myCollisionCallback );
if you want get which RigidBody are Collided do this ::
when you create a CollisionShape you must add userPointer like this ::
BoxShape groundShape = new BoxShape(new Vector3f(1000,10,1000));
rb = new RigidBody(constructionInfo);
...
groundShape.setUserPointer(rb);
and finaly in ContactaddedCallback you can check like this ::
ContactAddedCallback myCollisionCallback = new ContactAddedCallback() {
#Override
public boolean contactAdded(
ManifoldPoint cp,
CollisionObject colObj0,
int partId0,
int index0,
CollisionObject colObj1,
int partId1,
int index1) {
if (colObj0.getUserPointer().equals(rb)) {
//for sample you can push them to up
rb.applyCentralImpulse(new Vector3f(0,1,0));
}
if (colObj1.getUserPointer().equals(rb)) {
rb.applyCentralImpulse(new Vector3f(0,1,0));
}
System.out.println("hi i am collision !!");// :|
return false;
}
};