Unity Basics

Question 1

What should the Y axis be to position a gameobject perfectly level on a plane?

Answer 1

0.5

Question 2

How to add physics to a gameobject?

Answer 2

Add a rigidbody component

Question 3

When is Update() called?

Answer 3

Before rendering a frame

Question 4

When is FixedUpdate called?

Answer 4

Before performing any physics calculations

Question 5

What is an easy way to have the camera follow a gameobject?

Answer 5

Make the camera a child of the gameobject

Question 6

Which Update() is best to use for follow cameras, procedural animations, and gathering last known states?

Answer 6

LateUpdate()

Question 7

What is a prefab?

Answer 7

A prefab is an asset that contains a template or blueprint of a game object or game object family

Question 8

What happens when you make a change to a prefab?

Answer 8

All of the prefab instances in the game will be updated with the changes.

Question 9

How to make a game object dynamic?

Answer 9

Add a collider and a rigid body

Question 10

What determines whether a collider is static or not?

Answer 10

Whether or not it has a rigid body

Question 11

How to prevent an object with rigid body to react to physics?

Answer 11

Make the rigid body kinematic

Question 12

If a collider is moving or rotating (not static like a wall), what should you do to prevent the collider from being cached every frame?

Answer 12

Make the collider dynamic by adding a rigid body

Question 13

How are kinematic rigid bodies moved?

Answer 13

By using their transform

Question 14

How do you use a mesh collider alongside a rigid body?

Answer 14

Mark it as convex

Question 15

how would you write a 0.0 float in unity c#?

Answer 15

0.0f

Question 16

How would you make a custom class visible in the inspector and usable by other classes?

Answer 16

Add [System.Serializable] before the class

Question 17

Name a shader that would remove black from a material (transparent)

Answer 17

Particles/Additive

Question 18

What is the point of using mobile shaders?

Answer 18

They are a more efficient use of resources

Question 19

What is the disadvantages of using mobile shaders

Answer 19

You lose some quality and control

Question 20

How to access functions and variables from another class?

Answer 20

You must first make a reference to the instance of the class by finding the associated game object holding said instance.
ex:
public GameController gameController;

GameObject gameControllerObject = GameObject.FindWithTag(“GameController”);
gameController = gameControllerObject.GetComponent();

gameController.AddScore(scoreValue);

Question 21

How would you get the input key R?

Answer 21

Input.GetKeyDown(KeyCode.R)

Question 22

How to pivot around selected object with camera?

Answer 22

Select an object and press F to focus on it. Then, when you use the view orbit tool, it’ll rotate around that object (and its children).

Question 23

Describe an easy way to add a texture to a material

Answer 23

Change shader to legacy/diffuse and then you can add a texture

Question 24

what is directional light mainly used for

Answer 24

global lighting. think of it as the sun or moon

Question 25

What does the UV in UV mapping stand for?

Answer 25

In simple terms, X,Y,Z are spacial co-ordinates while U,V,W are surface/mesh co-ordinates.
This process projects a texture map onto a 3D object. The letters “U” and “V” denote the axes of the 2D texture because “X”, “Y” and “Z” are already used to denote the axes of the 3D object in model space.

Question 26

How would you make a variable public without having it show in the inspector?

Answer 26

Encapsulate it!
in visual studio: right click, refactor, encapsulate

public int EmptySlots {
    get {
        return emptySlots;
    }

    set {
        emptySlots = value;
    }

Question 27

What are the two main ways that programs can respond to changes in the world?

Answer 27

Polling and Events

Question 28

How do you setup the EventSystem to raycast out into the scene?

Answer 28

By adding a Physics Raycaster to the camera

Question 29

How to make a variable public in a script but hide it in the inspector?

Answer 29

[HideInInspector] before the variable

Question 30

How to add a tooltip to a variable that can be seen in the editor when hovering the variable?

Answer 30

[Tooltip(“Add this before the variable in the script”)]

Question 31

What does kinematic mean?

Answer 31

If isKinematicisenabled, Forces, collisions or joints will not affect the rigidbody anymore. The rigidbody will be under full control of animation or script control by changing transform.position.Kinematicbodies also affect the motion of other rigidbodies through collisions or joints

Question 32

What is the difference between a material and a texture?

Answer 32

Textures are just .png or .tiff images that you can access via MS paint, photoshop, etc. However, materials contain a variety of things. Heightmaps/Normalmaps are images that are usually blueish/pinkish and are calculated by Unity to show depth in a short of illusion. If you stand a few meters away, bricks will look like they have tiny crevaces, water will look like it has actual waves, carpet will look like it has some fibers sticking out. However if you get close enough, it’ll just be a flat shape (assuming you’ve placed it on a cube).

In short, a material contains a set of information for 3D looks, and may even contain physics information. A texture is just a picture.

Question 33

What is the difference between a material and a shader?

Answer 33

A material is what you apply to geometry to give it a colour and pattern. A texture is a component of a material.

A shader is a small program that allows this material to be rendered at runtime. The nice thing about shaders is that you can do everything from simply rendering the material, to adding dynamic effects like specular highlights and reflections all the way up to extremely clever things such as rendering fake holes through walls where a bullet has hit.