Mouse Controls

Use a script and the Input class to determine what mouse button is pressed:

Types of Mouse Button Input

Input.GetMouseButton() - Returns true each frame the button within the parentheses is pressed. This is great for clicking and dragging items and drawing.

Input.GetMouseButtonDown() - Returns true only on the first frame the button within the parentheses is pressed. This is best for switches and buttons.

Input.GetMouseButtonUp() - Returns true on the frame the button within the parentheses is released.

Inside the parentheses, you want to use an integer that represents the mouse button:

0 - Left Mouse Button

1 - Right Mouse Button

2 - Center / Pressing the Scroll Button

Since the code is to see if a key is pressed or not, the code is generally used in if statements.

Examples:

if (Input.GetMouseButton(0))
{
     // Something to do when the left mouse button is held down
}

if (Input.GetMouseButtonDown(1))
{
     // Something to do when the player right-clicks
}

Common Issue: The object that should continuously move only moves a tiny bit and only when the player continues to tap the mouse button. Solution: You might be using GetMouseButtonDown() which only runs for one frame. Try using GetMouseButton() instead.

Using the Input Manager

If you set up the Input Manager, track mouse movement with Input.GetAxis("Mouse X") and Input.GetAxis("Mouse Y").