Difference between OnCollision and OnEnter?

#1 Sorry for the slow reply I meant to post a reply early.
The difference is OnCollision is repeatedly called as long as something remains inside that trigger space and it is part of T3DRigidComponent to determine if any other collisions shapes have collided with you. OnEnter is call only once when on object collide for the first time with you triggers collision shape. The trigger class has its own update function OnStay that you should use.


Alan
Senior Software Engineer
Perfect Dork Studios

#2 Ok thanks for the reply.
While trying john`s code samples on triggers and pickup items. The examples work for onEnter() delegate but fail to detect collision for onCollision.

Eg

public void CreatePowerup()
        {
            //find the physics resolver
            RigidCollisionManager rigidManager = TorqueObjectDatabase.
            Instance.FindObject<RigidCollisionManager>("RigidManager");

            //get the Player object type
            TorqueObjectType typePlayer = TorqueObjectDatabase.Instance.GetObjectType("Player");
      //      TorqueObjectType typeProjectile = TorqueObjectDatabase.Instance.GetObjectType("Projectile");

            TorqueObject objPowerup = new TorqueObject();
            objPowerup.Name = "Powerup";

            //add the scene component
            T3DSceneComponent componentScene = new T3DSceneComponent();
            componentScene.SceneGroup = "Powerup";
            componentScene.Position = new Vector3(300.254f, -180.434f, 245f);
            objPowerup.Components.AddComponent(componentScene);
            T3DTSRenderComponent componentRender = new T3DTSRenderComponent();
            componentRender.ShapeName = @"data\shapes\items\Crates\MetalCrate.dts";
            componentRender.SceneGroupName = "Powerup";
            objPowerup.Components.AddComponent(componentRender);

            //create the trigger collision box
            CollisionBoxShape boxCollision = new CollisionBoxShape();
            boxCollision.Size = componentRender.ObjectBox.Max;
            
            //add the trigger component
            T3DTriggerComponent componentTrigger = new T3DTriggerComponent();
            componentTrigger.SceneGroupName = "Powerup";
            componentTrigger.CollisionBody.AddCollisionShape(boxCollision);
            componentTrigger.CollidesWith = typePlayer;

            componentTrigger.OnCollision = ProcessCollision;
            componentTrigger.OnEnter = ProcessEnter;
            componentTrigger.RigidManager = rigidManager;
            componentTrigger.Immovable = true;
            objPowerup.Components.AddComponent(componentTrigger);

            TorqueObjectDatabase.Instance.Register(objPowerup);
        }

Any idea what am i doing wrong ?

#3 I am not in front of my computer with a compile but one thing that mite be an issue is this: componentTrigger.CollidesWith = typePlayer;
I have never gotten that property to work correctly. Try taking that out and see if helps.
Also can you post the ProcessCollision function code, and is the example of john's you are following in the book or online?

Alan
Senior Software Engineer
Perfect Dork Studios

#4 No success even without componentTrigger.CollidesWith = typePlayer;

So here is the complete code

public static void ProcessCollision(T3DRigidComponent us, T3DRigidComponent them, 
        RigidContactConstraint.Contact[] contacts, int contactCount, float dt)
        {
            //get the current health level
            float currentHealth;
            PlayerManager.Instance.GetPlayer(0).GetData("HealthLevel", out currentHealth);

            //increase and store the new health level
            currentHealth -= 15;
            PlayerManager.Instance.GetPlayer(0).SetData("HealthLevel", currentHealth);

            //remove the power-up shape
            them.Owner.MarkForDelete = true;
        }



        // For Pickup
        public static void ProcessEnter(T3DTriggerComponent trigger, T3DRigidComponent obj)
        {
            //get the current health level
            float currentHealth;
            PlayerManager.Instance.GetPlayer(0).GetData("HealthLevel", out currentHealth);

            //increase and store the new health level
            currentHealth -= 15;
            PlayerManager.Instance.GetPlayer(0).SetData("HealthLevel", currentHealth);

            //remove the power-up shape
    //        obj.Owner.MarkForDelete = true;
            String name;
//            name = obj.Owner.Name;
            name = trigger.Owner.Name;

     //         trigger.Owner.Components.FindComponent<WeaponComponent3D>().FireWeapon();

            TorqueObject pickup = TorqueObjectDatabase.Instance.FindObject<TorqueObject>("Powerup");
            pickup.MarkForDelete = true;
        }