I've just been using Unity and chose to learn it by making a Pong game which sounded simple enough as a "hello world" type of game. My goal was to try and encompass enough of the built in engine without needed to write scripts but I ran into a few snafoos.

So far here is my setup:

Paddle Game Object:
-Box Collider
-RigidBody (Set as Kinematic)

Ball Game Object:
-Sphere Collider
-RigidBody (not kinematic)

Wall Game Object:
-Box or Plane Collider

I've set my material on my Ball to 'Bouncy' and I get a pretty good bouncing ball (given a starting force).

I've also added the following script to the Paddles:

    void OnCollisionEnter(Collision collision)
{
    BallRidigBody.AddForce(rigidbody.velocity);
}

Here are some of my snafoos:

1. Collision I was stuck for a while trying to figure out why my Kinematic objects wouldn't collide before stumbling upon the collision matrix. I was wondering what are good approaches to enable Kinematic collisions for my setup;
2. Force I'm confused how ApplyForce is done. Even if I pick ForceMode.Impulse, is that a constant force? I'm a bit stuck on how to get proper bouncing off the walls and paddle. Since I've already applied a starting force, should my wall apply force on an "onCollisionEnter" method or change the velocity?

Thanks!

I've just been using Unity and chose to learn it by making a Pong game which sounded simple enough as a "hello world" type of game. My goal was to try and encompass enough of the built in engine without needing to write scripts but I ran into a few problems.

Here is my setup so far:

Paddle Game Object:

• Box Collider
• RigidBody (Set as Kinematic)

Ball Game Object:

• Sphere Collider<
• RigidBody (not kinematic)

Wall Game Object:

• Box or Plane Collider

I've set my material on my Ball to 'Bouncy' and I get a pretty good bouncing ball (given a starting force).

I've also added the following script to the Paddles:

void OnCollisionEnter(Collision collision)
{
    BallRidigBody.AddForce(rigidbody.velocity);
}

Here are some of my problems:

1. Collision: I was trying to figure out why my kinematic objects wouldn't collide before stumbling upon the collision matrix. I was wondering what are good approaches to enable kinematic collisions for my setup;
2. Forces: I'm confused how ApplyForce should be used. Even if I pick ForceMode.Impulse, is that a constant force? I'm a bit stuck on how to get proper bouncing off the walls and paddle. Since I've already applied a starting force, should my wall apply force on an onCollisionEnter method or change the velocity?