3D colliders in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a BoxCollider component to the GameObject.

Unity

gameObject.AddComponent<[1]>();

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ARigidbody

BSphereCollider

CBoxCollider

DMeshRenderer

Attempts:

3 left

💡 Hint

Common Mistakes

Using SphereCollider instead of BoxCollider.

Adding MeshRenderer instead of a collider.

The BoxCollider component adds a box-shaped collider to the GameObject, which is used for 3D collision detection.

2fill in blank

medium

Complete the code to check if the GameObject has a Collider component.

Unity

if (gameObject.GetComponent<[1]>() != null) {
    Debug.Log("Collider found");
}

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ACollider

BTransform

CRigidbody

DMeshFilter

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for Rigidbody instead of Collider.

Checking for Transform which is not a collider.

The Collider class is the base class for all 3D colliders. Checking for it detects any collider type.

3fill in blank

hard

Fix the error in the code to detect collision with another object.

Unity

void OnCollisionEnter(Collision [1]) {
    Debug.Log("Collided with " + [1].gameObject.name);
}

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Ahit

Bcollision

Cother

Dcollider

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'collider' which is a different component.

Using 'other' or 'hit' which are not standard parameter names here.

The parameter name in OnCollisionEnter is commonly collision. It represents collision info.

4fill in blank

hard

Fill both blanks to create a dictionary of GameObjects and their BoxCollider sizes where the size's x dimension is greater than 1.

Unity

var bigColliders = new Dictionary<GameObject, Vector3>() {
    { [1], [2].size }
};

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AgameObject

BGetComponent<BoxCollider>()

Ctransform

DGetComponent<Rigidbody>()

Attempts:

3 left

💡 Hint

Common Mistakes

Using transform instead of gameObject as key.

Using Rigidbody instead of BoxCollider to get size.

We use gameObject as the key and get the BoxCollider component to access its size property.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps GameObjects to their collider bounds size if the collider is enabled and size x is greater than 0.5.

Unity

var colliderSizes = new Dictionary<GameObject, Vector3>() {
    { [1], [2].bounds.size }
} where [3].enabled && [2].bounds.size.x > 0.5;

Drag options to blanks, or click blank then click option'

AgameObject

BGetComponent<Collider>()

CGetComponent<BoxCollider>()

Dtransform

Attempts:

3 left

💡 Hint

Common Mistakes

Using transform as key instead of gameObject.

Using BoxCollider instead of Collider for bounds.

Not checking if collider is enabled.

The key is the gameObject. We get the Collider component to access bounds.size and check if it is enabled and size x is greater than 0.5.