Mouse input (GetMouseButton, position) in Unity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does Input.GetMouseButton(0) check in Unity?

It checks if the left mouse button is currently being pressed down.

beginner

How do you get the current position of the mouse cursor in Unity?

Use Input.mousePosition, which returns the mouse position in pixel coordinates relative to the bottom-left corner of the screen.

intermediate

What is the difference between Input.GetMouseButtonDown(0) and Input.GetMouseButton(0)?

GetMouseButtonDown(0) returns true only during the frame the left mouse button is pressed. GetMouseButton(0) returns true as long as the button is held down.

beginner

If you want to detect a right mouse button click, which parameter do you use with GetMouseButton?

Use Input.GetMouseButton(1) to detect the right mouse button.

intermediate

How can you convert Input.mousePosition to a world position in Unity?

Use Camera.main.ScreenToWorldPoint(Input.mousePosition) to convert the screen pixel position of the mouse to a position in the game world.

What does Input.GetMouseButton(0) return when the left mouse button is not pressed?

A True

B Null

C False

D Throws an error

Input.GetMouseButton(0) returns false when the left mouse button is not pressed.

Which method returns true only on the exact frame the mouse button is pressed?

A Input.GetMouseButtonDown(0)

B Input.GetMouseButtonUp(0)

C Input.GetMouseButton(0)

D Input.mousePosition

Input.GetMouseButtonDown(0) returns true only during the frame the button is first pressed.

What type of value does Input.mousePosition return?

A Vector2 with world coordinates

B Integer

C Boolean

D Vector3 with screen pixel coordinates

Input.mousePosition returns a Vector3 representing the mouse position in screen pixels.

How do you detect a right mouse button press in Unity?

A Input.GetMouseButton(0)

B Input.GetMouseButton(1)

C Input.GetMouseButton(2)

D Input.GetMouseButtonDown(0)

The right mouse button is detected with Input.GetMouseButton(1).

Which function converts mouse screen position to world position?

A Camera.main.ScreenToWorldPoint()

B Input.GetMouseButton()

C Input.mousePosition.ToWorld()

D Camera.main.WorldToScreenPoint()

Camera.main.ScreenToWorldPoint() converts screen coordinates to world coordinates.

Explain how to detect when the left mouse button is pressed and get the mouse position in Unity.

Think about checking the button press and reading the position separately.

Describe how to convert the mouse position from screen space to world space in Unity.

Remember the camera translates screen pixels to game world.