Unity 3D Programming

Question 1

From which menu can you create a new C# script?

Answer 1

Assets

Question 2

Match the type to the expression. 1. float 2. float or int 3. int 4. other A. 1 B. int someInt; C. “Some text” D. 1.0f

Answer 2

1D, 2A, 3B, 4C

Question 3

What type is someVariable? float someVariable = 2;

Answer 3

float

Question 4

What is the result type of the following operation? 2 + 2

Answer 4

int

Question 5

What is the type of someResult ? float someFloat = 3; int someInt = 3; ??? someResult = someFloat + someInt;

Answer 5

float

Question 6

Which is the correct suffix for floating point numbers?

Answer 6

f

Question 7

Why would you choose to wrap some functionality into a method?

Answer 7

To deal with concepts at a higher level.

Question 8

What is the return type of this function declaration? int DoSomething (string aValue) { }

Answer 8

int

Question 9

What types of variable does this take? float AnotherMethod(string foo, int bar) { }

Answer 9

string and int

Question 10

What type does this method return? [omitted] SomeMethod () { return 2.0f + 1.0f; }

Answer 10

float

Question 11

What in the following would cause an error in Visual Studio? 1. float Square (float numberToSquare) { 2.float square = numberToSquare * numberToSquare * numberToSquare; 3. }

Answer 11

Nothing returned from the method.

Question 12

What is the correct way to create a 3D vector?

Answer 12

new Vector3 (1.0f, 1.0f, 1.0f)

Question 13

Which of the following is a valid operation on vectors (assume variables a and b contain Vector3)?

Answer 13

a.magnitude

Question 14

In the following lines of code, why do we use a dot? Vector3 a = new Vector3(1, 2, 3); float myX = a.x;

Answer 14

To access the contents x of the a variable

Question 15

What data is a Vector3 made up of?

Answer 15

3 floats

Question 16

What is an example of an object?`

Answer 16

A component of a GameObject

Question 17

Which of the following lines of code correctly gets a render component?

Answer 17

Renderer r = GetComponent( );

Question 18

What type is returned from the following line of code? GetComponent()

Answer 18

Collider

Question 19

GetComponent is a function used to find components of a certain type. Where will it search for components?

Answer 19

On the current GameObject.

Question 20

In which method should you do work relating to Physics?

Answer 20

FixedUpdate( )

Question 21

Order the following based on order of execution: A. Start() B. Update() C. FixedUpdate() D. LateUpdate()

Answer 21

1A, 2C, 3B, 4D

Question 22

Which of the following lines of code adds a force to a GameObject?

Answer 22

Rigidbody rb = GetComponent( ); rb.AddForce(new Vector3(0, 0, force));

Question 23

What is the correct definition of FixedUpdate?

Answer 23

void FixedUpdate( ) { }

Question 24

What is the time between FixedUpdate calls?

Answer 24

Fixed but configurable

Question 25

What is returned by ScreenPointToRay?

Answer 25

A Ray.

Question 26

What are the arguments to ScreenPointToRay?

Answer 26

Screen space coordinates

Question 27

Which component of the Ray object gives us the vector along which the Ray points?

Answer 27

.direction

Question 28

Which of the following functions would be best suited to helping debug a Ray that doesn’t seem to be pointing in the correct direction?

Answer 28

Debug.DrawRay( )

Question 29

How do we get the mouse coordinates in screen space?

Answer 29

Input.mousePosition

Question 30

When combining two rotations into a new rotation, is the order important?

Answer 30

Yes, always.

Question 31

Quaternion.Euler() builds a rotation out of 3 seperate rotations about x, y and z axes. Which order are these performed in?

Answer 31

z, x and y

Question 32

Quaternion.LookRotation() is a…

Answer 32

Method on the class Quaternion.

Question 33

Suppose I have a Vector3 which defines by rotation called a. Supposing I want to rotate 90 degrees around this axis, how would I construct a Quaternion to do this?

Answer 33

Quaternion rotation = Quaternion.AngleAxis (90, a) ;

Question 34

How is a Quaternion internally stored?

Answer 34

Using x, y, z and w variables.