Custom Controller Example: Having an Entity Fire Shots

void SpinController::Move(void)
{
    Matrix3D    rotator;
    World *world = TheWorldMgr->GetWorld();
 
    // Calculate the new spin angle based on how much time has passed
    float angle = spinAngle + spinRate * TheTimeMgr->GetFloatDeltaTime();
 
    if (angle > 100.0F) angle -= 200.0F;
    else if (angle < -100.0F) angle += 200.0F;
 
    spinAngle = angle;
 
    Node *target = GetTargetNode();
    Point3D startPos = target->GetNodePosition();
 
    //you dont want the ammo to start inside the plane - this is just in front of the plane
    startPos.y += 5.0F;
 
    const Point3D& worldCenter = target->GetBoundingSphere()->GetCenter();
    Point3D objectCenter = target->GetInverseWorldTransform() * worldCenter;
 
    //This fires forward and down - should really use the direction the plane is facing
    //Point3D objectVelocity = Point3D(0.0f, 1.0f, -0.1f);
 
    //This firing direction points along the local y axis - ie the direction the entity (plane) is heading
    Point3D objectVelocity = Point3D(-originalTransform[1].x,-originalTransform[1].y,-originalTransform[1].z);
 
 
    //You can hard code the starting pos of the fireball if you want
    //startPos = Point3D(5.0f, 5.0f, 2.0f);
 
    // Now make a 3x3 rotation matrix
    rotator.SetRotationAboutY(angle/10.0F);
 
    //Firing
    if (world)
    {
	Controller	*controller;	
	Entity *entity = nullptr;
 
	//Fire on some condition - here is just an example for a quick test
	if (((int)angle) % 30 == 0)//fire every x seconds
	{
		//create fireball!!
		controller = new FireballController(startPos, objectVelocity);
		entity = Entity::Get(kEntityFireball);
 
		if (entity)
		{
			entity->SetController(controller);
 
			Zone *zone = world->FindZone(startPos);
 
			Point3D zonePosition = zone->GetInverseWorldTransform() * startPos;
			entity->SetNodePosition(zonePosition);
			zone->AddNewSubnode(entity);
			entity->Update();
 
			controller->EnterWorld(zone, zonePosition);
		}
	}
    }
    //end Firing
 
    // Make a 3x4 transform that rotates about the center point
    Transform4D transform(rotator, objectCenter - rotator * objectCenter);
 
    //Code added for a translation along the y axis
    Transform4D translation;
    Point3D myTranslation;
    myTranslation.x = 0.0F;
    myTranslation.z = 0.0F;
    myTranslation.y = -angle;
    translation.SetIdentity();
    translation.SetTranslation(myTranslation);
 
    //apply the rotation and the translation to the original transform
    target->SetNodeTransform(originalTransform * translation * transform);
 
    // Invalidate the target node so that it gets updated properly
    target->Invalidate();
}