Tags and layers in Unity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a tag in Unity?

A tag is a label you assign to a GameObject to identify it easily in your scripts. For example, you can tag all enemies with "Enemy" to find them quickly.

beginner

What is a layer in Unity?

A layer is a way to group GameObjects for rendering and physics purposes. Layers help control which objects interact or are visible to cameras.

beginner

How do you check a GameObject's tag in a script?

You use gameObject.CompareTag("TagName") or check gameObject.tag == "TagName" to see if it has a specific tag.

intermediate

Why use layers for physics collisions?

Layers let you control which objects collide by setting collision rules in the Physics settings. This improves performance and game logic.

beginner

Can a GameObject have multiple tags or layers?

No, a GameObject can have only one tag and one layer at a time. But you can create custom tags and layers to organize your objects better.

What is the main purpose of tags in Unity?

A To control rendering order

B To group objects for physics collisions

C To identify GameObjects easily in scripts

D To change object colors

Tags help you identify and find GameObjects in your scripts quickly.

How many tags can a GameObject have at once?

A None

B Two

C Multiple

D One

A GameObject can have only one tag at a time.

What is a common use of layers in Unity?

A To control which objects collide

B To assign textures

C To name GameObjects

D To write scripts

Layers help control physics collisions and rendering visibility.

Which method is recommended to check a GameObject's tag in code?

A gameObject.GetTag()

B gameObject.CompareTag("TagName")

C gameObject.HasTag("TagName")

D gameObject.CheckTag()

CompareTag is the recommended and efficient way to check tags.

Can layers affect camera visibility?

A Yes, cameras can cull layers

B No, layers only affect physics

C No, layers only affect tags

D Yes, layers change object colors

Cameras can be set to render or ignore specific layers.

Explain the difference between tags and layers in Unity and give an example of when to use each.

Think about how you find objects vs how you control collisions or visibility.

Describe how you would use layers to optimize physics collisions in a Unity game.

Consider how layers can prevent unnecessary collision checks.