Detecting goals

OK, we can throw the ball. Now, we need to detect if you got a goal and keep score. To detect a goal, we will add a Collider to the goal and handle any collision events from the ball. When you make a goal, you should be congratulated with audio and visual feedback and the points added to your score. First, let's detect whether you've made a goal. In the next section, we'll tackle keeping score.

Goal collider

To detect a goal, we will add a 3D Cube game object with a collider to the basket. It will only be an invisible collider, that is, not rendered as part of the scene. We want collisions to trigger events, which we'll handle in a script:

1. With BoxballGame selected in Hierarchy, create a new 3D Cube, named GoalCollider.
2. Set its Transform Position to (0, 2.5, 0) and Scale (1.8, 0.05, 1.8).
3. On its Box Collider component, check the Is Trigger checkbox.
4. Remove its Mesh Renderer component (gear-icon|Remove Component).
5. The following screenshot shows the scene with GoalCollider before...