Unity cheat sheet

Or just “refresh my memory sheet”

Monobehaviour

Always a component of a gameobject.

Comfusingly these event methods aren’t override, they’re just kinda there.

• Awake: When loading the script into memory for the first time, regardless if the script is enabled or not.
• Start: When a script is enabled for the first time.
• Update: Once per frame.
• LateUpdate: Once per frame after all the Updates have been called.
• FixedUpdate: At 50hz.

To make a field writable from the editor (allows “dependency injection”) make a field in the c# class and annotate it with [SerializeField].

“New input system”

The old one was apparently hot garbage. The new one is an (enabled-by-default) package. Everything is under using UnityEngine.InputSystem.

InputActionAsset. One always seems to be pre-created. Can edit with the nice gui. One asset can be set as the project-wide input actions, which makes it globally accessible from code at InputSystem.actions.

They contain action maps, each action map contains InputActions.

• finding a (project-wide) action: InputAction blah = InputSystem.actions.FindAction("name")
• enabling an action: blah.Enable()
  • all the project-wide ones are enabled by default
• finding a vector2 input: blah.ReadValue<Vector2>
• finding whether a button is pressed this frame: blah.IsPressed()
• button press callbacks: blah.performed += SomeFunction
  • where SomeFunction takes an InputAction.CallbackContext

making a wasd action:

• make one called Move
• set Control Type to “Vector 2”
• right click Move and hit Add Up/Down/Left/Right Composite
• bind those to w, s, a, d

making a look action:

• set Control Type to “Vector 2”
• add a binding
• in “path” click Mouse -> Delta