2D camera setup in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the camera to orthographic mode.

Unity

Camera.main.orthographic = [1];

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

Atrue

Bnull

Cfalse

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting orthographic to false keeps the camera in 3D mode.

Using null or 0 causes errors.

Setting Camera.main.orthographic to true switches the camera to 2D orthographic mode.

2fill in blank

medium

Complete the code to set the orthographic size of the camera to 5.

Unity

Camera.main.orthographicSize = [1];

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

A10

B-5

C0

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or negative values causes no visible view or errors.

Using too large values zooms out too much.

The orthographicSize controls the vertical size of the camera view in orthographic mode. Setting it to 5 is common for 2D setups.

3fill in blank

hard

Fix the error in the code to move the camera to position (0, 0, -10).

Unity

Camera.main.transform.position = new Vector3([1], 0, -10);

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

A0

B1

C10

D-10

Attempts:

3 left

💡 Hint

Common Mistakes

Setting x to 10 moves the camera off-center.

Using -10 for x is incorrect here.

The camera's x position should be 0 to center it horizontally. The z position is already set to -10 to look at the scene.

4fill in blank

hard

Fill both blanks to smoothly follow the player on the x and y axes.

Unity

Vector3 targetPosition = new Vector3(player.transform.position[1], player.transform.position[2], -10);

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

A.x

B.y

C.z

D.position

Attempts:

3 left

💡 Hint

Common Mistakes

Using .z would follow depth, which is not needed in 2D.

Using .position twice is incorrect syntax.

To follow the player horizontally and vertically, use .x and .y to get the player's position on those axes.

5fill in blank

hard

Fill all three blanks to clamp the camera's x and y position within limits and keep z at -10.

Unity

float clampedX = Mathf.Clamp(player.transform.position[1], [2], [3]);
float clampedY = Mathf.Clamp(player.transform.position.y, -5, 5);
Camera.main.transform.position = new Vector3(clampedX, clampedY, -10);

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

A.x

B-3

C3

D.y

Attempts:

3 left

💡 Hint

Common Mistakes

Using .y instead of .x for clamping x position.

Swapping min and max values in clamp.

Not clamping the x position at all.

Clamp the player's x position between -3 and 3 using Mathf.Clamp and access the x coordinate with .x. The y position is clamped separately.

Practice

1. What is the main reason to set a Unity camera to Orthographic mode in a 2D game?

easy

A. It increases the camera's field of view.

B. It removes perspective, showing objects without depth distortion.

C. It automatically follows the player character.

D. It enables 3D rendering with shadows.

Solution

1. Step 1: Understand camera modes in Unity

   Unity cameras can be set to Perspective or Orthographic. Perspective shows depth with size changes, Orthographic does not.

2. Step 2: Identify the effect of Orthographic mode

   Orthographic mode removes perspective distortion, making objects appear the same size regardless of distance, ideal for 2D games.

3. Final Answer:

   It removes perspective, showing objects without depth distortion. -> Option B

4. Quick Check:

   Orthographic = No perspective distortion [OK]

Hint: Orthographic means no depth, perfect for 2D views [OK]

Common Mistakes:

• Confusing orthographic with perspective mode
• Thinking orthographic adds 3D effects
• Assuming orthographic auto-follows player

2. Which of the following is the correct way to set a Unity camera to orthographic mode in C#?

easy

A. camera.mode = Orthographic;

B. camera.isOrthographic = true;

C. camera.setOrthographic(true);

D. camera.orthographic = true;

Solution

1. Step 1: Recall Unity Camera properties

   The Camera class has a boolean property called orthographic to switch modes.

2. Step 2: Identify correct syntax

   The correct syntax to enable orthographic mode is camera.orthographic = true;. Other options use incorrect property names or methods.

3. Final Answer:

   camera.orthographic = true; -> Option D

4. Quick Check:

   Property name is orthographic [OK]

Hint: Use camera.orthographic = true to enable orthographic mode [OK]

Common Mistakes:

• Using incorrect property names like isOrthographic
• Trying to call a method instead of setting a property
• Assigning string or enum instead of boolean

3. Given this code snippet in Unity C#:

Camera.main.orthographicSize = 5f;
Debug.Log(Camera.main.orthographicSize);

What will be printed in the console?

medium

A. 5

B. 10

C. 0

D. Error: orthographicSize is read-only

Solution

1. Step 1: Understand orthographicSize property

   The orthographicSize controls half the vertical size of the camera view in world units and can be set and read.

2. Step 2: Analyze the code output

   The code sets orthographicSize to 5f, then logs it. So the output will be 5.

3. Final Answer:

   5 -> Option A

4. Quick Check:

   Set orthographicSize = 5, output = 5 [OK]

Hint: orthographicSize is half the vertical view size [OK]

Common Mistakes:

• Thinking orthographicSize doubles the value
• Assuming orthographicSize is read-only
• Confusing orthographicSize with field of view

4. You want the camera to follow the player smoothly in 2D. Which code snippet fixes the error in this code?

void Update() {
  Vector3 targetPos = player.transform.position;
  targetPos.z = -10;
  transform.position = targetPos;
}

The camera jumps abruptly instead of moving smoothly.

medium

A. Use Vector3.Lerp to interpolate between current and target positions.

B. Set targetPos.z = 0 instead of -10.

C. Call transform.Translate(targetPos) instead of setting position.

D. Remove the z-axis assignment to let camera auto-adjust.

Solution

1. Step 1: Identify the problem with abrupt movement

   Directly setting transform.position to player position causes instant jumps without smooth transition.

2. Step 2: Apply smooth movement using interpolation

   Using Vector3.Lerp blends current and target positions over time, creating smooth camera movement.

3. Final Answer:

   Use Vector3.Lerp to interpolate between current and target positions. -> Option A

4. Quick Check:

   Smooth follow = Vector3.Lerp [OK]

Hint: Use Vector3.Lerp for smooth camera movement [OK]

Common Mistakes:

• Ignoring z-axis setting causing camera clipping
• Using transform.Translate incorrectly
• Removing z-axis assignment breaks camera depth

5. You want to set up a 2D camera in Unity that shows exactly 20 units vertically and follows the player with an offset of (2, 3) units smoothly. Which code snippet correctly sets the orthographic size and follows the player with offset?

hard

A. camera.fieldOfView = 20f;
transform.position = player.position + new Vector3(2, 3, -10);

B. camera.orthographicSize = 20f;
Vector3 target = player.position + new Vector3(2, 3, 0);
transform.position = target;

C. camera.orthographicSize = 10f;
Vector3 target = player.position + new Vector3(2, 3, -10);
transform.position = Vector3.Lerp(transform.position, target, 0.1f);

D. camera.orthographicSize = 5f;
transform.position = player.position + new Vector3(2, 3, -10);

Solution

1. Step 1: Calculate orthographicSize for 20 units vertical view

   Orthographic size is half the vertical size, so 20 units vertical means orthographicSize = 10.

2. Step 2: Set camera position with offset and smooth follow

   Adding offset (2,3) to player position and setting z to -10 keeps camera behind. Using Vector3.Lerp smooths movement.

3. Final Answer:

   camera.orthographicSize = 10f; Vector3 target = player.position + new Vector3(2, 3, -10); transform.position = Vector3.Lerp(transform.position, target, 0.1f); -> Option C

4. Quick Check:

   OrthographicSize = half vertical size, smooth follow with Lerp [OK]

Hint: OrthographicSize = half vertical view; use Lerp for smooth follow [OK]

Common Mistakes:

• Setting orthographicSize equal to full vertical size
• Not using smooth interpolation for camera movement
• Using fieldOfView instead of orthographicSize for 2D camera