Obstacle avoidance in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to make the object move forward continuously.

Unity

void Update() {
    transform.Translate(Vector3.[1] * Time.deltaTime);
}

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

Aleft

Bforward

Cright

Dup

Attempts:

3 left

💡 Hint

Common Mistakes

Using Vector3.up moves the object upwards instead of forward.

Using Vector3.right moves the object sideways.

Using Vector3.forward moves the object forward in its local space.

2fill in blank

medium

Complete the code to detect obstacles using a raycast.

Unity

if (Physics.Raycast(transform.position, transform.forward, [1])) {
    Debug.Log("Obstacle detected!");
}

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

A5f

BVector3.forward

CTime.deltaTime

Dtransform.position

Attempts:

3 left

💡 Hint

Common Mistakes

Using Vector3.forward as distance causes a type error.

Using Time.deltaTime is incorrect because it is a time value, not distance.

The raycast needs a distance as a float value to check for obstacles within that range.

3fill in blank

hard

Fix the error in the code to rotate the object away from an obstacle.

Unity

if (Physics.Raycast(transform.position, transform.forward, 5f)) {
    transform.Rotate(0, [1], 0);
}

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ATime.deltaTime

B"90"

CVector3.up

D90

Attempts:

3 left

💡 Hint

Common Mistakes

Using "90" (string) causes a compile error.

Using Vector3.up is incorrect because Rotate expects float angles.

The Rotate method expects a float angle, so 90 (without quotes) is correct.

4fill in blank

hard

Fill both blanks to make the object stop moving when an obstacle is detected.

Unity

void Update() {
    if (Physics.Raycast(transform.position, transform.forward, [1])) {
        speed = [2];
    } else {
        speed = 5f;
    }
    transform.Translate(Vector3.forward * speed * Time.deltaTime);
}

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

A5f

B0

C10f

D-5f

Attempts:

3 left

💡 Hint

Common Mistakes

Setting speed to a negative value causes backward movement.

Using a different raycast distance than the movement check causes inconsistency.

The raycast distance is 5f, and speed is set to 0 to stop movement when an obstacle is detected.

5fill in blank

hard

Fill all three blanks to make the object avoid obstacles by turning right and moving forward.

Unity

void Update() {
    if (Physics.Raycast(transform.position, transform.forward, [1])) {
        transform.Rotate(0, [2], 0);
    }
    transform.Translate(Vector3.forward * [3] * Time.deltaTime);
}

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

A5f

B90

C3f

D10f

Attempts:

3 left

💡 Hint

Common Mistakes

Using a negative rotation angle turns left instead of right.

Using a speed of 0 stops the object from moving.

The raycast distance is 5f, the object rotates 90 degrees to the right, and moves forward at speed 3f.