3 - Sound and Effects

Question 1

What is the Sprite Renderer?

3.1.1 Open Prototype & change background

Answer 1

Component that enables you to render or see images in your game and environment

3.1.1 Open Prototype & change background

Question 2

What are <> used for?

3.1.3 Make player jump at start

Answer 2

They are used for finding specific things like components.

3.1.3 Make player jump at start

Question 3

If transform.translate can move an object physically just using positions, what does Adding Force on the Rigidbody do?

3.1.3 Make player jump at start

Answer 3

It applies forces to things using physics

3.1.3 Make player jump at start

Question 4

Make an object jump with force

In the start method, write the code to call the Rigidbody component and apply force using the Rigidbody variable “playerRb”.

Integer for force is your choice

3.1.3 Make player jump at start

Answer 4

playerRb = GetComponent< Rigidbody >();
playerRb.AddForce(Vector3.up * 1000);

3.1.3 Make player jump at start

Question 5

What does the following code achieve?

3.1.3 Make player jump at start

Answer 5

Adds force to an object on the Y axis (jump)

3.1.3 Make player jump at start

Question 6

Make the player jump if spacebar is pressed. Rewrite and adjust the cod

void Start()
{
playerRb = GetComponent< Rigidbody >();
playerRb.AddForce(Vector3.up * 1000);
}

void Update()
{

}

3.1.4 Make player jump is spacebar is pressed

Answer 6

void Start()
{
playerRb = GetComponent< Rigidbody >();
}

void UPdate()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * 1000);

3.1.4 Make player jump is spacebar is pressed

Question 7

What is a ForceMode?

3.1.4 Make player jump is spacebar is pressed

Answer 7

ForceMode tells Unity how AddForce should be applied to the Rigidbody

3.1.4 Make player jump is spacebar is pressed

Question 8

What are the options of ForceMode?

Answer 8

1.ForceMode.Force
2. ForceMode.Impulse
3. ForceMode.VelocityChange
4. ForceMode.Acceleration

Question 9

Describe ForceMode.Force

Answer 9

Applies continuous force, affected by the mass of the object

Question 10

Describe ForceMode.Impulse

Answer 10

Applies an instant force to simulate a sudden impact or burst

Mass is still considered but it’s a one time push

Question 11

What could you use ForceMode.Force on an object for?

Answer 11

Things with gradual acceleration, like wind, jet engines or movement over time.

Question 12

What could you use ForceMode.Impulse on an object for?

Answer 12

Use this for explosions, gunshots, jump bursts, etc.

Question 13

Describe ForceMode.VelocityChange

Answer 13

Directly changes the velocity of the Rigidbody, instantly. Ignores mass.

Directly changes the velocity of the Rigidbody, instantly. Ignores mass.

Question 14

What could you use ForceMode.VelocityChange on an object for?

Answer 14

Ideal for things like sudden dashes, teleport-like bursts, or snappy platformer jumps.

Question 15

Describe ForceMode.Acceleration

Answer 15

Applies an acceleration over time, ignoring mass.

Question 16

What could you use ForceMode.Accelration on an object for?

Answer 16

Can be good for jetpacks, gravity-like forces, or engine thrust in space. Use when you want consistent acceleration across objects of any mass.

Question 17

What is the Syntax for an AddForce statement?

Answer 17

Rigidbody.AddForce(Vector3, ForceMode)

Question 18

Change code to add the ForceMode Impulse

void Start()
{
playerRb = GetComponent< Rigidbody >();
}

void UPdate()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * 1000);

3.1.4 Make player jump is spacebar is pressed

Answer 18

void Start()
{
playerRb = GetComponent< Rigidbody >();
}

void UPdate()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * 1000, ForceMode.Impulse);

3.1.4 Make player jump is spacebar is pressed

Question 19

What does *= mean

Answer 19

Times Equal

Question 20

Modify the code

1. Create a public variable for AddForce and modify the code.
2. Create a public variable for a gravity modifer
3. Call the gravity modiifer in Start method

void Start()
{
playerRb = GetComponent< Rigidbody >();
}

void UPdate()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * 10, ForceMode.Impulse);

3.1.5 Tweak the jump force and gravity

Answer 20

public float jumpForce = 10.0f;
public float gravityModifier;

void Start()
{
playerRb = GetComponent< Rigidbody >();
Physics.gravity = gravityModifier
}

void UPdate()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);

3.1.5 Tweak the jump force and gravity

Question 21

What is a bool, or boolean?

3.1.6 Prevent Player from double jumping

Answer 21

Data type - a value that holds true or false

3.1.6 Prevent Player from double jumping

Question 22

What does && mean?

3.1.6 Prevent Player from double jumping

Answer 22

“And”

3.1.6 Prevent Player from double jumping

Question 23

We want to make sure the player can’t keep pressing space in the air to keep going higher.

1. Write a variable to test if the player is on the ground
2. Modify the if statement so that when the player is in the air they can’t press space

public float jumpForce = 10.0f;
public float gravityModifier;

void Start()
{
playerRb = GetComponent< Rigidbody >();
Physics.gravity = gravityModifier
}

void Update()
{
if (Input.GetKeyDown(KeyCode.Space))
playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);

3.1.6 Prevent Player from double jumping

Answer 23

public float jumpForce = 10.0f;
public float gravityModifier;
public bool isOnGround;

void Start()
{
playerRb = GetComponent< Rigidbody >();
Physics.gravity = gravityModifier
}

void Update()
{
if (Input.GetKeyDown(KeyCode.Space) && isOnGround)
playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
isOnGround = false;
}

3.1.6 Prevent Player from double jumping

Question 24

Describe what is happening in this code

void Update()
{
if (Input.GetKeyDown(KeyCode.Space) && isOnGround)
playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
isOnGround = false;
}

3.1.6 Prevent Player from double jumping

Answer 24

When space bar is pressed and character is on the ground, object jumps into the air. Once in the air, the object is written to be no longer on the ground, and so the space bar cannot be pressed in the air.

3.1.6 Prevent Player from double jumping

Question 25

We've made it so you can't spam jump when in the air by making isOnGround false, but the problem is we never defined how to set it back to true. Using colliders, write a new method to ensure the program knows when the character is back on the ground by making isOnGround = true. | Name the method OnCollisionEnter ## Footnote 3.1.6 Prevent Player from double jumping

Answer 25

private void OnCollisionEnter(Collision collision) { isOnGround = true; } ## Footnote 3.1.6 Prevent Player from double jumping

Question 26

# What is this code saying in our PlayerController script? private void OnCollisionEnter(Collision collision) { isOnGround = true; } ## Footnote 3.1.6 Prevent Player from double jumping

Answer 26

Any time our PlayerController comes into collision with something, then isOnGround = true; ## Footnote 3.1.6 Prevent Player from double jumping

Question 27

Make a variable startPos and in the Start method define it as the starting position of our background sprite. ## Footnote 3.2.2 Reset position of Background

Answer 27

private Vector3 startPos; void Start() { startPos = transform.position; } ## Footnote 3.2.2 Reset position of Background

Question 28

We want our background to repeat as it moves left on the X axis. Write the Update method for the code below. private Vector3 startPos; void Start() { startPos = transform.position; } ## Footnote 3.2.2 Reset position of Background

Answer 28

private Vector3 startPos; void Start() { startPos = transform.position; } void Update(0 { if (transform.position.x < -50) { transform.position = startPos; } } ## Footnote 3.2.2 Reset position of Background

Question 29

# Modify the code The repeating background is currently stuttery. Use the background's Object collider to fix it. Write a new variable to get the width of the component and divide it by 2 to create a seamless, left flowing background. private Vector3 startPos; void Start() { startPos = transform.position; } void Update(0 { if (transform.position.x < -50) { transform.position = startPos; } } ## Footnote 3.2.3 Fix background repeat with collider

Answer 29

private Vector3 startPos; **private float repeathWidth; ** void Start() { startPos = transform.position; **repeatWidth = GetComponent().size.x / 2;** } void Update(0 { if (transform.position.x < startPos.x - **repeatWidth**) { transform.position = startPos; } } ## Footnote 3.2.3 Fix background repeat with collider

Question 30

# Modify the code Write an if statement to check if our Player collides with another game object. Use tag "Ground" as the other game object. Write a game over variable to check if the game is over. public float jumpForce = 10.0f; public float gravityModifier; public bool isOnGround; void Start() { playerRb = GetComponent< Rigidbody >(); Physics.gravity = gravityModifier } void Update() { if (Input.GetKeyDown(KeyCode.Space) && isOnGround) playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse); isOnGround = false; } | HINT: You'll need to write a new method ## Footnote 3.2.4 Add a new game over trigger

Answer 30

public float jumpForce = 10.0f; public float gravityModifier; public bool isOnGround; **public bool gameOver;** void Start() { playerRb = GetComponent< Rigidbody >(); Physics.gravity = gravityModifier } void Update() { if (Input.GetKeyDown(KeyCode.Space) && isOnGround) playerRb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse); isOnGround = false; } **private void onCollisionEnter (Collision, collision) { if(collision.gameObject.CompareTag("Ground") { isOnGround = true; } else if(collision.GameObject.CompareTag("Ground") { Debug.Log("Game Over"); gameOver = true; }** ## Footnote 3.2.4 Add a new game over trigger

Question 31

Describe what the following code is doing. private void onCollisionEnter (Collision, collision) { if(collision.gameObject.CompareTag("Ground") { isOnGround = true; } else if(collision.GameObject.CompareTag("Ground") { Debug.Log("Game Over"); gameOver = true; } ## Footnote 3.2.4 Add a new game over trigger

Answer 31

Check collision with the object tagged with Ground. If player object collides with ground, then variable isOnGround is true. Also if, sends a debug message "Game Over" as well as the bool gameOver equals true. ## Footnote 3.2.4 Add a new game over trigger

Question 32

We need two scripts to interact. What are steps to make this happen. ## Footnote 3.2.5 Stop Move Left on gameOver

Answer 32

1. We need to create a variable that can hold a reference to our script 2. Call the script in the Start method 3. Find the name of your object 4. Get the component ## Footnote 3.2.5 Stop Move Left on gameOver

Question 33

We want our MoveLeft script to stop on game over. We need to hold a reference to the PlayerController script inside the moveLeft script. Write that variable.

Answer 33

private PlayerController playerControllerScript;